Skip to main content

Filter By:

  • Show More Brands

  • Show Fewer Brands
  • Show More Sizes
  • Show Fewer Sizes
  • Show More Model Years
  • Show Fewer Model Years

Wheels

$25.95
WTB's TCS AL valves are aluminum to shed grams, and come in catchy anodized red, black, or blue. A stepped lock nut adds compatibility among various rim drillings, a smooth pump interface makes adding air easy, and a removable core makes setting beads and injecting sealant a cinch. - Presta - 46mm
$61.99
Sta Tru Front Wheel - Single Wall rim - Hub/Brake Compatibility: Rim Brake - Wheel Size: 18-inch - ISO Diameter: 355 / 18-inch BMX - Front Axle: 3/8-inch x 100mm - Tire Type: Clincher
$129.99
Replacement Alloy HGR (HG-Road) Freehub Body, with Anti-Bite Technology, for all HEX Rear Hubs. Includes spacer ring to also allow the use of MTB cassettes. Compatible with: - All HEX J-Type, Straightpull, and Gravel rear wheels Not compatible with: - SPIKE/OOZY/SPOON hubs
$114.99
The Spank 359 Rim is a radially compliant gravity rim featuring our Oohbah Inverted Inner Wall and BeadBite anti-burp technology. Optimized for DH, FR, and heavy enduro use. - Moderately low 19mm profile height and wide width balances the benefits of radial compliance with high lateral stiffness and predictable handling. - Radial Compliance improves traction over bumps and chatter while reducing negative feedback to the rider. Performance and comfort are improved. - 5mm inner width is extremely versatile, fitting tires from 2.0" to 2.6", and even allowing + size tire use without negative squaring off of tire profiles. - Bead Bite tubeless hooks enhance tubeless performance and tire security, even at lower pressures.
$62.00
Yes! A 12mm thru-axle adapter for BOB Trailers. These Robert Axles for BOB Trailers are specifically engineered to attach the proven BOB Trailer to your thru-axle-equipped bike. Take full advantage of your modern bike with 12mm thru-axles and harness the rigidity of the thru-axle to haul your BOB Trailer. Set out on any adventure, big or small. Great for off-road tours, trail building, hauling cargo, and more! - The axle shaft and axle end are precision CNC-machined. - The axle shaft is 7075 aluminum and hard black-anodized for rugged durability. - The axle ends are stainless steel which allows for mounting of the BOB Trailer bobbins. - No special tools required. The design allows for wheel installation or removal using your standard 5mm hex wrench. - Please note: This axle does not come with the BOB Trailer bobbins (those are available separately). Or, you can reuse your bobbins from the stock BOB Trailer Quick Release that came with your trailer. - Designed, built, and quality tested in the USA. Proven around the world.
$109.00
Quality Wheels Value Series Disc Rear Wheel 26 SRAM 406 6-bolt / Sun SR25 Black
$9.99 - $153.99
Looking for a super lightweight but badass tubeless sealant? Boom, you've just found it my friend! No Puncture Hassle performs under the most brutal race conditions. The cutting-edge microfiber molecules fill the bigger holes and tears, whilst the advanced latex forms a strong seal instantly. The formula also contains a unique UV detection system that highlights any punctures you haven’t seen during your ride. Developed with the world's top downhillers and pro peloton teams, to give you the finest tire sealant available. It's non-corrosive and easily washes off with water. Compatible with tubeless ready and full UST wheels/tires, No Puncture Hassle works from 15psi-120psi and temperatures from -20°C to +50°C. Our pouch is designed to fit your Presta valve perfectly and is ideal to add to your toolkit or ride pack for emergency top ups on the go! - For Downhill, Enduro and Road tires - Seals tears and holes up to 6mm - Contains UV puncture detection - Won't dry out or ball - Works from 15psi-120psi and temperatures from -20°C to +50°C - Biodegradable
$85.00
New Sheriff hubs are the ultimate in track racing hubs. They minimize weight with larger cutouts in the flanges, lightened axles, shorter bolts, and slimmer end caps than previous versions. The result is a hubset that weighs a mere 432g, 198g for the front, and 234g for the rear. This makes it one of the lightest track hubsets in the world, a figure even more impressive when you consider that All-City didn't eliminate the usefulness of a fixed / fixed or fixed / free option as most racing hubs do. They feature the finest Japanese manufactured 6902 bearings which roll incredibly fast and smooth while retaining excellent seals for all weather, all-day everyday durability. Front hub specs: - Weight: 198g - Torque Spec: 33nm (25ft lbs.) - Non-Drive Side Center to Flange: 34mm - Drive Side Center to Flange: 34mm - Non-Drive Side Flange Diameter: 62mm - Drive Side Flange Diameter: 62mm Rear hub specs: - Weight: 234g - Torque Spec: 33nm (25ft.lbs.) - Non-Drive Side Center to Flange: 29mm - Drive Side Center to Flange: 29mm - Non-Drive Side Flange Diameter: 62mm - Drive Side Flange Diameter: 62mm
$119.00
This wheel matches original equipment for Surly Long Haul Trucker.
$185.00
HED Belgium G alloy rims make any custom wheel build that much sweeter. With 30mm external and 25mm internal widths, you can add tire volume, smoothness, and rolling speed to any bike or hub set. All Belgium rims feature a welded rim joint, and are drilled for a standard presta valve. Spoke drilling is down the centerline of the rim (not offset). Please carefully read the specifications below to find out detailed information on the different rims we offer. 700c - Tire Type: Clincher (tubeless compatible) - Rim Width (External): 30mm - Rim Depth: 24mm - Hole Counts: 24, 28, 32 - Color: Black - Brake Track: N/A - Wheel Size: 700c - Weight: 453 grams - Max Pressure: 80psi - ERD: 592mm 650B - Tire Type: Clincher (tubeless compatible) - Rim Width (External): 30mm - Rim Depth: 24mm - Hole Counts: 28 and 32 - Color: Black - Brake Track: N/A - Wheel Size: 650b - Weight: 426 grams - Max Pressure: 80psi - ERD: 555mm
$1.80 - $7.35
Wheels Manufacturing Outer Axle Nuts are high-grade steel nuts that provide secure wheel fixing for solid-axle wheels. - 14mm x 1mm (1411-AN) sold in pairs - All others sold individually
$749.95
CZR i30 wheels were designed to handle it all, which is why they feature a strategically reinforced carbon layup and are hand built using double-butted spokes, brass nipples and high-engagement hubs featuring top-tier bearings and oversized freehub seals to establish themselves as wheels that simply won't quit. Solid Strip & TCS Tape - Durable nylon strip that lies between the rim and tubeless tape to prevent tubeless tape from pushing into the spoke holes and ensures a smooth interface between the tire and rim. The smooth surface makes it easier to mount a tire by preventing air from escaping around the bead at each indent during inflation. Solid Strip also protects the airtight system from puncture in the case of a broken spoke. 3-Cross Lacing & Brass Nipples - Too many companies are trying to save weight by offering "enduro" wheels with 2-cross lacing patterns and inadequate alloy nipples. While those are suitable for XC and light trail usage, there's no replacement for the long-term reliability of a 3-cross lacing pattern with brass nipples holding it all together. Frequency Hub - The world's best carbon rims deserved to be paired with high-quality hubs that further improve the performance of a lightweight, dependable carbon wheelset. Frequency hubs feature a low-drag, 6-pawl design that alternates contact between two sets of 3-pawl groupings to provide a responsive 5 degrees of freehub engagement. Heavy-Duty Pawl Springs - CZR i30 wheels feature heavy-duty pawl springs that engage with greater force to counteract the additional torque caused by sudden cranking on steep trails. We also offer a Light Pawl-Spring Kit that can be purchased separately for CZR i30 riders who prefer a quieter hub with lighter pawl engagement. Usage: Trail, Enduro
$18.99
WeThePeople's Supreme Hub Guards are made of low-friction nylon fiberglass. Simply replace the cones on your Supreme Front and Cassette Hubs for a perfect fit without having to spread your dropouts. Available for both front and rear. These guards now feature a heat-treated chromoly insert for longer life.
$34.99
Get your WeThePeople Arrow Front Hub Axle/Cone Set and freshen up that front end that's a little wobbly after that last time you cased it on the spine.
$250.00
HED's entire line of Big Deal fat rims can now be purchased as a rim-only for the custom build of your dreams. Our demanding, discerning, and fat-loving customers have spoken: They love our Big Deal carbon rims. Nothing else offers the same combination of easy tubeless setup, stiffness, and jaw-dropping weight savings. They're utterly fat-tastic. In an effort to bring the advantages of Big Deal technology to an even wider audience, our engineers worked hard to apply the same principles to an aluminum platform. Enter: the Big Aluminum Deal and Big Half Aluminum Deal. At 80mm wide, these rims offer superb fit with all common fat bike tire sizes. They have the same patented Inflatobam tubeless technology as their carbon brethren - saving over a pound in inner tubes alone. What's the difference between the B.A.D. and the B.H.A.D.? Only the rim diameter. The B.A.D. has a 26" diameter, while the B.H.A.D. is made for larger 27.5" fat bike tires. Additional Info - Rim Type: Tubeless-Ready Clincher - Rim Width: 80mm - Rim Material: 6061 Aluminum - Rim Weight: 695g - Color: Black - Rim Hole Count: 32 - MIN/MAX TIRE SIZE: 3.8 - 5.0" - Drill Pattern: Symmetrical Only - Decal Type: Shadow - Rim ERD: 586 (27.5"), 562mm (26"), 510mm (24")
$1,600.00
The ENVE 65 is a modern speed specialist in every way. Triathletes and road racers seeking PRs in their objectives against the clock will find their efforts rewarded by the ENVE 65. - Application: Road Race, Triathlon, Time-Trial - Internal Rim Width: 21mm - Compatible Tire Size: Tubeless 25c or larger - Wheelset Weight: 1641g - Real World Foundation Aero Technology - Wide Hookless Bead provides pot-hole protection - Tubeless Optimized for Rolling Fast and Fewer Flats - Lifetime Incident Protection and 5 Year Factory Warranty - Handmade in Ogden, Utah
$29.99
V2 Tubeless valves are stronger, lighter, and even easier to use thanks to the machined aircraft grade 7075 aluminum and Muc-Off's new Tire Insert air ?ow system. The new design features six slots that are machined into the base of the valve stem, allows tubeless sealant ?uid and air to ?ow freely, even when running tubeless tire inserts. - 7075 Machined Aluminum valve stem and cap - Tire Insert air flow system keep air moving freely and compatible with most tire foam inserts - 4mm machined Allen Key slot for easy installation and removal - Includes Valve Core Removal Tool (integrated into spare alloy cap) - Supplied with various rubber bases to optimize fit with multiple rim types
$581.95
The features of the Zonda wheel have been enhanced even further with a C17 rim that is compatible with more comfortable clincher tires. It's also 10g lighter than the previous version. Zonda is one of Campagnolo's best-selling aluminum wheels. It's packed with technological innovations that make it a highly sophisticated solution compared to what other brands offer for the same price. A smaller hub diameter combined with the differentiated rim height (24/27mm) and the new self-locking nipples offer a front wheel that's smooth to steer and bump-resistant: racing on this model is a safe bet. - One of the best-selling wheels of all time, the Zonda is an aluminum wheel boasting technologies that are far more sophisticated than any other product of its kind, within this price range, on the market. - Weight and stiffness are optimized thanks to the milled rim with differentiated height - Aerodynamic spokes and self-locking nipples guarantee performance and reliability - The lightweight structure and hi-tech features of these wheels make them ideal for racing or grand fondo cycling. - The robustness and reliability that set the Zonda apart make it one of the best wheels for road cycling.
$2,550.00
What It Is The G27 is the G23's little big brother. Smaller in diameter and lighter in weight, the G27 is designed for the higher-volume tires demanded by many riders on rougher and looser terrain. At 320 grams, our lightest tubeless rim is 27mm wide and designed for tires marked 27.5 or 650B. Armed against pinch flats with the patent-pending Wide Hookless Bead, the G27 is at home off-road and capable on tamer stretches of singletrack. Who It's For Those seeking the challenge of drop-bar riding over more technical terrain that is typically frequented by mountain bikes will benefit from the additional air volume, durability, and anti-flat performance benefits provided by the G27. If your path leads you to rough roads, single tracks, and multi-day bikepacking adventures, the G27 may be for you. Why We Made It There is a place between road and mountain that is open to discovery. Beyond the range of your trail bike or the capabilities of your road bike. Terrain littered with contradicting challenges and demanding requirements are at odds with the bikes and products available today. We built the new G27 to thrive in this new environment because insights gained through building the world's best road and mountain bike rims told us that the perfect combination did not exist in our stable, or in our opinion, anywhere at all. The higher volume and lower pressures would demand MTB toughness and flat resistance, while big days and long miles would require the light weight and efficiency of a road machine. Above all, the combination of rough and rigid would require a wheel with the ride quality to make those long miles enjoyable and multi-day treks possible.
$70.00
The Drive Thru is a dummy hub or chain keeper that replaces your wheel while cleaning the chain. It is a fast and effective way to clean your chain between races or in your garage. It allows you to fully rotate your cranks and shift through your complete range of gears while protecting the frame. Installs simply with one hand, and is quick and easy to change between bikes. The Drive Thru is also great for packing the bike for transport. *This Drive Thru Value Meal includes three dummy axles with 1.0, 1.5 and 1.75 thread pitches and one pulley. - Value Meal includes 1.0, 1.5, and 1.75mm thread pitch dummy axles. - All Drive Thru dummy axles are 12mm in diameter. - Dummy axles are precision machined from 7075 aluminum and knurled for easy grip. - Pulleys are machined from durable Delrin. - Oil and solvent resistant O-rings - Lead-in threads designed for quick insertion into the frame - Simple, one-handed installation (no tools required)
$94.99
The Rampage rear wheel rolls on a four-bearing sealed cassette hub with 14mm chromoly axle. It's hand-laced to a 36-hole Rampage double-wall rim, and features a 11T chromoly driver with 3-pawl system.It's designed for BMX 110mm wide frames. - Axle: 14mm chromoly - Driver: 1-pc chromoly RHD, 11T - Driver bearings: 6802 (x2), verify bearing number on side of rubber seal - Driver pawls: 3 pawl - Driver spring: Wraparound (x1) - Hardware: Steel (17mm wheel nuts) - Hub shell bearings: 6902 (x2) verify bearing number on side of rubber seal - Drilling: 36H
$2,500.00
Fastest XC Wheels In the Real World 1240 grams is an obscenely light weight when talking about mountain bike wheelsets, the kind of weight that XC racers dream about. But light weight alone is no longer enough. So, we engineered the new Control SL wheels to be sharp handling, smooth riding, extra durable, and 22% less likely to pinch-flat your tires, in addition to being some of the lightest weight production wheels on the planet. - Rim Type: Carbon clincher, 2Bliss Ready, Zero Bead Hook 4mm FlatTop design. Compatible with tire inserts. - Rim Width: 29mm internal - Front Hub: Alloy body, 15mmx110 thru-axle, 19 and 31mm OD end cap options included. Max Rotor Size <200mm - Front Spoke Pattern: DT Swiss Aerolite Straightpull 294mm, 24-hole, Two-cross - Rear Hub: CNC-machined alloy body, SiNC Ceramic Bearings, premium-quality DT 180 internals and 36t quick engagement ratchet system cassette, includes SRAM XD Driver and 148 end caps. Max Rotor Size <200mm - Rear Spoke Pattern:DT Swiss Aerolite Straightpull 294mm, 24-hole, Two-cross - Bearing Type: SiNC Ceramic Sealed cartridge - Nipple Type: DT Swiss Pro Lock Hexagonal Alloy 14mm 2.0mm - Total Wheelset Weight: 1240g - System Weight Limit: 275lbs/125kg
$349.95 $690.00 49% Off
Trail wheels often fall into two categories—they're either heavy and durable or light and flexy. And because of this, a lightweight, wide-profile, and enduro-ready carbon wheel seems like something only found in a fairytale, but lucky for you, we made it a reality. The Traverse SL Fattie 27.5 puts all the flickable, nimble features you need in an all-mountain wheel into one package, and it has the results to prove it. Along with light overall weight, stiffness, and durability, another top priority for the Traverse SL was ease of use. First off, we got rid of the creaky straight-pull spokes and corrosion-prone alloy nipples. Next up, we landed on 28 J-bend spokes, for both the front and rear wheels, that are all the same length—making it easy to find replacements if needed. And finally, we engineered a new hub design, with a wider profile and higher flange to aid in overall stiffness. What's with the big-boned name, you ask? The Traverse SL Fatties may be wide, but with a 30mm inner rim width, they're far from the girth of a fat bike rim. But let's talk width. You've probably noticed that mountain bike rim widths have hovered between 19 and 23 millimeters for decades, and they've been long overdue for a change. In the search for a better wheel design, our engineers began testing 2.3- to 2.5-inch tires on 45-millimeter-wide fat bike rims to see what, if any, benefits could be found. It only took them a few rides to realize that the wider rims offered a variety of advantages, like adding additional tire volume, which better supports the tires in hard cornering, greatly improves traction because of the ability to run lower pressures, and noticeably increases rim stiffness. They did note that there is an occurrence of diminishing returns with increasing width, however, and after testing everything from 25 to 45mm, determined that a 30mm inner width is optimal. After determining the width, we began designing the rim using the knowledge that we gained when developing the Control SL. With this, we started with our Zero Bead Hook technology that gets rid of the weak spot found in a traditional wheel, and combined it with the wider profile to make a carbon rim that effectively dissipates forces. This way, you can take abuse from rocks without the worry of cracks or dents. Ok, so they're strong, impact-resistant, and tire supporting-they must be heavy, right? Wrong. Even though "fattie"? is in their name, they're far from fat. To achieve this weight, we hand-build our rims to our own alloy hubs, using only the highest quality DT Swiss Competition Race spokes. Inside our hubs, you'll find DT Swiss 240 internals with a quick engaging 54t DT Swiss star ratchet system in the rear that allows you to power over rocks and roots without delay. And while machines do a pretty good job of building wheels, we choose professionally trained humans because they do so with an artistic touch that makes for minimal flaws. Whether you need a carbon wheelset to get you through an enduro stage or one to shred your local rock garden, the Traverse SL Fattie has you covered. - Assembly Method: Hand-built - Bearing Type: Sealed cartridge - Every wheel includes tubeless valve stems in order to make tubeless set-up a touch easier. - Front Hub: Alloy body, 15mmx110 thru-axle, 19 and 31mm OD end cap options included. - Front Spoke Pattern: Two-cross - Nipple Type: DT Swiss Brass Pro Lock hexagonal - Rim Material: Carbon fiber - Rim Type: Carbon clincher, 2Bliss Ready, Zero Bead Hook design. Black graphic under clear coat. - Rim Width: 30mm internal - Roval Engineered J-bend hubshells have a single spoke length for each wheelset. - Spoke Count: 28h Front - Spoke Type: DT Swiss Competition Race J-bend - Total Wheelset Weight: 1690g
$725.00
The all-new Rapide CL II wheelset brings the Rapide CLX II’s speed, efficiency, incredible handling, and stability in any conditions to more riders. Built on the exact same rims as the Rapide CLX II to elevate all this performance with tubeless-done-right technology, the Rapide CL II makes that performance easier to catch at check-out and you almost impossible to catch on the open road. - Tire Size: 24mm - 38mm; Max Pressure: 24mm-35mm: Tubeless (110psi) Tubed (130psi), 36mm – 38mm: Tubeless (60psi) Tubed (60psi) - Weight: Wheelset 1,590g, Front 725g, Rear 865g (including 15g, tubeless rim tape and tubeless valve) - Assembly Method: Hand built at every step; from rim layup to the last nipple turn. - System Weight Limit: 275lbs /125kg.
$40.00
Wheels Mfg axles are made from aircraft quality 4130 alloy steel, made specifically for Wheels Mfg. It’s heat-treated to increase strength without making the axle brittle. Rolled threads make for easy assembly of cones & locknuts. - Fits many Shimano / Japanese rear hubs with 135mm spacing - Type: Hollow Axle - Threads: 10mm x 1 - Diameter: 10mm - Length: 146mm - 1 axle per bag
$5.00
Keeping contamination out of your internally geared hub is critical to its function and longevity. Sometimes, the oil port bolt comes loose and it's easy to lose, even if you've just taken it out to oil your hub. Keep a spare or two so your hub stays clean inside and it'll last you many, many miles.
$710.00
Feel your bike come alive on the open road with the new Alpinist CL II, featuring the lightest, best-handling clincher rims we have ever made, elevated with the performance of a tubeless system. The brand new Alpinist CL II now brings mountain-taming performance slightly closer to earth with a carefully selected build designed to let riders take full advantage of the low rim and spoke mass. The Alpinist CL II utilizes the same rim as the alpinist clx ii. They react to even the slightest increase in power with immediate acceleration and carve the purest lines in the corners, yet they can also handle almost double the impact standards of every certifying body. The result is a 1375-gram tubeless wheelset with an otherworldly ride quality designed for real-world road pressures. The Alpinist CL II utilizes components curated to keep you rolling and rolling fast. The DT Swiss 350 hubs, featuring their star ratchet drive system, are reliable and easy to service, while 24 DT Swiss comprace straight-pull spokes front and rear, laced to the rims with their alloy pro lock nipples, are synonymous with reliability and can be obtained at any bike shop. The reduced rolling resistance of a tubeless setup is undeniable, as are the benefits of improved handling and incredible puncture protection. It took the most extensive and demanding engineering and testing program we've ever undertaken. As a result of this extensive development, the Alpinist CL II features a hooked rim that can handle a huge range of pressures up to 110psi and offers an easier set up and mounting experience than ever. - Rim: Alpinist CLX Carbon Clincher, 700c, Disc Brake, Tubeless - Rim Details: 33mm Depth, 27mm External Width, 21mm Internal Width - Hub: DT Swiss 350 Straightpull Center Lock, Star Ratchet 36t internals (10 degs), 100x12mm & 142x12mm, Shim. RD. 11SP HG freehub - Bearing Type: DT Swiss Sealed Steel Cartridge Bearings - Spokes: DT Swiss Competition Race Straightpull, Front: Radial/Two-cross (2:1) 21 count, DS: 276mm, NDS: 290mm; Rear: Two-cross (1:1) 24 count, DS: 283mm NDS: 287mm - Nipple: DT Swiss Hex Prolock Al 2.0x14mm - Tire Size: 24mm—38mm; Max Pressure: 24mm-35mm: Tubeless (110psi) Tubed (130psi), 36mm-38mm: Tubeless (60psi) Tubed (60psi) - Weight: Wheelset 1,375g, Front 606g, Rear 769g (including 15g, tubeless rim tape and tubeless valve) - Assembly Method: Hand built at every step; from rim layup to the last nipple turn. - Extras: Roval Rim Tape, Spare Spoke & Nipple Kit, System Weight Limit: 275lbs/125kg
$40.00
Wheels Mfg axles are made from aircraft quality 4130 alloy steel, made specifically for Wheels Mfg. It’s heat-treated to increase strength without making the axle brittle. Rolled threads make for easy assembly of cones & locknuts. - Fits many Taiwanese hubs with 135mm spacing - Type: Hollow Axle - Threads: 9.5mm x 26tpi - Diameter: 9.5mm - Length: 146mm - 1 axle per bag
$40.00
Wheels Mfg axles are made from aircraft quality 4130 alloy steel, made specifically for Wheels Mfg. It’s heat-treated to increase strength without making the axle brittle. Rolled threads make for easy assembly of cones & locknuts. - Fits many Shimano / Japanese front hubs - Type: Hollow Axle - Threads: 9mm x 1 - Diameter: 9mm - Length: 110mm - 1 axle per bag
$85.00
Hubs typically seem to fall into two general categories: light and very expensive or heavy and cheap. With this typical bike industry paradigm, we saw an opportunity. You see, for years we've been using high-end geared hubs from the manufacturer of our track offerings on our personal bikes. They are very lightweight (peep the specs) and just plain work. We decided to finally make those hubs available to you and corner the market in our own category: lightweight, affordable, and incredibly practical. We've ridden them on all kinds of bikes from mtb to road and we're in love. They are reliable, dang light and very reasonably priced. We offer the Go-Devil in a minimal amount of configurations and ship them with all the necessary endcaps and a quick release skewer, future proofing them in case you want to use them on various bikes over the years. Quick Release, 12mm, and 15mm endcaps are included. On all models we spec high-quality made in Japan stainless-steel sealed bearings. Oh, and we've got polished options as well. Kind of a big deal because polished hubs have become a rarity in our modern world. - Weight: Disc Brake: 164g - Includes 12mm, 15mm endcaps and quick release skewer - Non-Drive Side Center To Flange Disc Brake: 21mm - Drive Side Center To Flange Disc Brake: 36mm - Non-Drive Flange Diameter Disc Brake: 58mm - Drive Side Flange Diameter Disc Brake: 45mm