--- title: Lightweight Design, Proven Durability | ProX Steel Sprockets description: ProX Ultralight rear sprockets for dirt bikes provide an unmatched combination of longevity and lightweight design - available for all popular models. image: ?t=1633447217799#keepProtocol --- - [HOME](http://www.pro-x.com) - [PRODUCTS](http://www.pro-x.com/products/) - [NEWS](http://www.pro-x.com/news/) - [TEAM & SERIES](http://www.pro-x.com/teams/) - [SUPPORT](http://#) - [PRODUCT CATALOGUE](http://www.pro-x.com/media/catalogue/) - [COUPONS](http://www.pro-x.com/coupons/) - [APPAREL](http://www.pro-x.com/prox_apparel) - [CONTACT](http://www.pro-x.com/contact/) [![Prox_logo_CMYK_Frame.png](https://blog.pro-x.com/hs-fs/hubfs/ProX/Prox_logo_CMYK_Frame.png?width=320&height=96&name=Prox_logo_CMYK_Frame.png "Prox_logo_CMYK_Frame.png")](https://blog.pro-x.com/) ,[NEWS](https://blog.pro-x.com/topic/news) ,[NEW PRODUCTS](https://blog.pro-x.com/topic/new-products) ,[VIDEOS](https://blog.pro-x.com/topic/videos) ,[UTV](https://blog.pro-x.com/topic/utv) [Rebuilding RZR Engines the Easy Way: Polaris 800 Rebuild Kits](https://blog.pro-x.com/rebuilding-rzr-engines-the-easy-way-polaris-800-rebuild-kits) ,[Maintenance](https://blog.pro-x.com/topic/maintenance) ,[Build Features](https://blog.pro-x.com/topic/build-features) [Yamaha YZ250FX Raced, Rebuilt & Raced Again](https://blog.pro-x.com/yamaha-yz250fx-engine-rebuild-with-prox-piston-and-rod) ,[FEATURES](https://blog.pro-x.com/topic/features) ,[Powersports](https://blog.pro-x.com/topic/powersports) ,[Maintenance](https://blog.pro-x.com/topic/maintenance) [ProX Parties with the Babes! | Babes in the Dirt 7](https://blog.pro-x.com/prox-parties-with-the-babes-babes-in-the-dirt-7) ,[Powersports](https://blog.pro-x.com/topic/powersports) ,[ENGINE TECH](https://blog.pro-x.com/topic/engine-tech) ,[Tech](https://blog.pro-x.com/topic/tech) ,[Maintenance](https://blog.pro-x.com/topic/maintenance) ,[How-To](https://blog.pro-x.com/topic/how-to) [Why Replacing your 4-Stroke Motorcycle's Cam Chain can Prevent Engine Failure](https://blog.pro-x.com/why-replacing-your-4-stroke-motorcycles-cam-chain-can-prevent-engine-failure) ,[NEWS](https://blog.pro-x.com/topic/news) ,[NEW PRODUCTS](https://blog.pro-x.com/topic/new-products) [Lightweight Design, Proven Durability | ProX Steel Sprockets](https://blog.pro-x.com/lightweight-design-proven-durability-prox-steel-sprockets) - [BLOG HOME](https://blog.pro-x.com) - [NEWS](https://blog.pro-x.com/topic/news) - [NEW PRODUCTS](https://blog.pro-x.com/topic/new-products) - [TECH](https://blog.pro-x.com/topic/tech) - [HOW-TO](https://blog.pro-x.com/topic/how-to) - [MAINTENANCE](https://blog.pro-x.com/topic/maintenance) - [FEATURES](https://blog.pro-x.com/topic/features) - [VIDEOS](http://www.youtube.com/user/ProXRacingParts) - [PROX YOUTUBE CHANNEL](https://www.youtube.com/user/ProXRacingParts) Search the blog ![](https://blog.pro-x.com/hubfs/ProX/NEW%20PRODUCTS/Ultralight%20Steel%20Sprockets/ProX%20Ultralight%20Social%20Lead.png) # [Lightweight Design, Proven Durability | ProX Steel Sprockets](https://blog.pro-x.com/lightweight-design-proven-durability-prox-steel-sprockets) October 5, 2021 / by [Kevin Bailey](https://blog.pro-x.com/author/kevin-bailey) - [Tweet](https://twitter.com/share) From cruising trails with buddies to serious off-road and on-track racing, ProX sprockets have delivered impressive durability, especially in steel construction. ProX steel rear sprockets have been proven in highly demanding racing situations, including worldwide Enduro as well as GNCC and Hare and Hound in the U.S. While they last beyond what may even seem possible sometimes, the main disadvantage for steel has always been the extra weight in comparison to ProX aluminum sprockets. [![dirt bike sprockets and chain](https://blog.pro-x.com/hs-fs/hubfs/ProX/NEW%20PRODUCTS/Ultralight%20Steel%20Sprockets/IMG_2514.jpg?t=1475023575990&width=640&name=IMG_2514.jpg)](https://blog.pro-x.com/hubfs/ProX/NEW%20PRODUCTS/Ultralight%20Steel%20Sprockets/IMG_2514.jpg) **A new Ultralight sprocket paired-up with a gold X-ring chain, countershaft sprocket, and new sprocket hardware.** ProX engineers set out to revise the steel sprocket with the goal of achieving the best of both worlds - the extreme durability of ProX's steel construction with the advantages of less weight.  ![lightweight rear sprocket](https://blog.pro-x.com/hs-fs/hubfs/ProX/NEW%20PRODUCTS/Ultralight%20Steel%20Sprockets/IMG_2521%20(2).jpg?width=6720&name=IMG_2521%20(2).jpg) An all-new, lightweight design gives ProX Ultralight steel rear sprockets up to a 35% weight savings over other standard steel sprockets. The high-strength, steel construction provides superior longevity even in extreme riding conditions, ultimately translating to 2 to 3 times the usable life compared to average aluminum sprockets. [![ProX Ultralight Rear Sprocket](https://blog.pro-x.com/hs-fs/hubfs/ProX/NEW%20PRODUCTS/Ultralight%20Steel%20Sprockets/ProX%20Sprocket%20Header%20Image%20V2%20(2).png?t=1475023575990&width=640&name=ProX%20Sprocket%20Header%20Image%20V2%20(2).png)](https://blog.pro-x.com/hubfs/ProX/NEW%20PRODUCTS/Ultralight%20Steel%20Sprockets/ProX%20Sprocket%20Header%20Image%20V2%20(2).png) **Specially designed and precision-machined, ProX Ultralight sprockets can drop a third of the weight over some standard steel sprockets.** ProX Ultralight sprockets are CNC-machined to exact specifications to achieve the precise, lightweight design and exact fitment. Additionally, a diamond cut manufacturing method holds sprocket teeth to diameter and alignment tolerances, ensuring even and smooth operation.  ![ultralight sprocket close up ps](https://blog.pro-x.com/hs-fs/hubfs/ProX/NEW%20PRODUCTS/Ultralight%20Steel%20Sprockets/ultralight%20sprocket%20close%20up%20ps.jpg?width=671&name=ultralight%20sprocket%20close%20up%20ps.jpg) Reliable, flush sprocket-to-hub mounting is achieved with countersunk, tapered mounting holes, pairing perfectly with a set of ProX sprocket bolts and lock nuts. These sprockets are also treated with a full coverage coating for added corrosion and wear resistance, plus a factory look. ![prox sprocket and chain ktm husqvarna](https://blog.pro-x.com/hs-fs/hubfs/ProX/NEW%20PRODUCTS/Ultralight%20Steel%20Sprockets/20210716_151053.jpeg?width=671&name=20210716_151053.jpeg) ProX Ultralight steel sprockets are offered for a wide range of dirt bike applications in all popular sizes. ### *Purchase from your favorite e-tailer or dealer, or contact us to order directly in the US!* ### [![Contact Us to Order Directly in the US](https://no-cache.hubspot.com/cta/default/2297913/02adddbd-a671-4d76-8b2a-c146a4ee0a99.png)](https://cta-redirect.hubspot.com/cta/redirect/2297913/02adddbd-a671-4d76-8b2a-c146a4ee0a99) ### *Find your Ultralight sprocket part number below.* | **Make** | **Models** | **Years** | **Part No.** | **Size** | | --- | --- | --- | --- | --- | | Beta | RR 125 - 498 | 2013 – 2022 | 07.RS73013R-48 07.RS73013R-49 07.RS73013R-50 07.RS73013R-51 | 48T 49T 50T 51T | | Honda | CR125R, CR250R, CRF250R, CRF450R | 1987 – 2022 | 07.RS12087R-48 07.RS12087R-49 07.RS12087R-50 07.RS12087R-51 07.RS12087R-52 | 48T 49T 50T 51T 52T | | Husqvarna | CR/W 125 – 360 | 1990 – 2013 | 07.RS62097R-46 07.RS62097R-47 07.RS62097R-48 07.RS62097R-49 07.RS62097R-50 07.RS62097R-51 07.RS62097R-52 | 46T 47T 48T 49T 50T 51T 52T | | Husqvarna | TC85 | 2014 – 2022 | 07.RS61003R-46 07.RS61003R-47 07.RS61003R-48 07.RS61003R-49 07.RS61003R-50 07.RS61003R-51 | 46T 47T 48T 49T 50T 51T | | Husqvarna | TC/FC/FE 125 – 501 | 2014 – 2022 | 07.RS62090R-48 07.RS62090R-49 07.RS62090R-50 07.RS62090R-51 07.RS62090R-52 | 48T 49T 50T 51T 52T | | Kawasaki | KX 125/250/250F/450F | 1987 – 2021 | 07.RS42080R-47 07.RS42080R-48 07.RS42080R-49 07.RS42080R-50 07.RS42080R-51 07.RS42080R-52 | 47T 48T 49T 50T 51T 52T | | KTM | 85/105 SX | 2003 – 2022 | 07.RS61003R-46 07.RS61003R-47 07.RS61003R-48 07.RS61003R-49 07.RS61003R-50 07.RS61003R-51 | 46T 47T 48T 49T 50T 51T | | KTM | 125 – 530 SX/XC/EXC, SX-F, XC-F, EXC-F | 1990 – 2022 | 07.RS62090R-48 07.RS62090R-49 07.RS62090R-50 07.RS62090R-51 07.RS62090R-52 | 48T 49T 50T 51T 52T | | Suzuki | RM-Z 250 RM-Z 450 | 2007 – 2022 2005 – 2022 | 07.RS32080R-48 07.RS32080R-49 07.RS32080R-50 07.RS32080R-51 07.RS32080R-52 | 48T 49T 50T 51T 52T | | Yamaha | YZ 125/250 WR250 | 1980 – 1998 1990 – 1998 | 07.RS22080R-48 07.RS22080R-49 07.RS22080R-50 07.RS22080R-51 07.RS22080R-52 | 48T 49T 50T 51T 52T | | Yamaha | YZ/WR 250/400/426/450F | 1998 – 2022 | 07.RS22099R-47 07.RS22099R-48 07.RS22099R-49 07.RS22099R-50 07.RS22099R-51 07.RS22099R-52 | 47T 48T 49T 50T 51T 52T | Topics: [NEWS](https://blog.pro-x.com/topic/news), [NEW PRODUCTS](https://blog.pro-x.com/topic/new-products), [featured](https://blog.pro-x.com/topic/featured) ### Related posts [Rebuilding RZR Engines the Easy Way: Polaris 800 Rebuild Kits](https://blog.pro-x.com/rebuilding-rzr-engines-the-easy-way-polaris-800-rebuild-kits) [Complete Lineup of Performance Replacement Parts for Sherco Motorcycles from ProX](https://blog.pro-x.com/complete-lineup-of-performance-replacement-parts-for-sherco-motorcycles-from-prox) #### Written by [Kevin Bailey](https://blog.pro-x.com/author/kevin-bailey) [\[fa icon="facebook-square"\]Facebook](https://www.facebook.com/kbailey33?ref=bookmarks) [\[fa icon="linkedin-square"\]Linkedin](https://www.linkedin.com/in/kevin-bailey-64b2a8133/) ### NEVER MISS A POST #### FOLLOW US - 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