These 12 speed cassettes will fit on wheels and trainer freehub bodies as long as they’re 11 speed Hyperglide or “HG11” freehub bodies.ġ2 speed cassettes are not compatible with wheels and trainers that have 10-speed only Hyperglide freehub bodies. UPDATE October 2021: Shimano’s 12 speed road drivetrains were announced recently for their Dura-Ace R9200 and Ultegra R8100 series. UPDATE October 2022: Tacx now offers a Microspline freehub body to retrofit some Tacx direct drive trainers.Įlite offers a retrofittable Microspline freehub body. At this time, we are not aware of trainer companies that have a Microspline retrofit, but we will update when this changes. Shimano introduced their 12 speed mountain bike drivetrains in 2019, and these cassettes fit a new Microspline freehub standard. Most trainer manufacturers make all three of these optional freehub body types to retrofit on their trainers. Higher-end SRAM 12 speed mountain bike cassettes will fit either a [SRAM XD freehub body, or an XDR freehub body with an additional 1.8 mm spacer. SRAM 12 speed “SX” and “NX” Eagle mountain bike cassettes will fit a standard Shimano/SRAM freehub body. SRAM 12 speed road bike cassettes will only fit on a SRAM XDR freehub body Please check with your trainer’s manufacturer for additional info.Ĭampagnolo 11 and 12 speed cassettes will only fit on a Campagnolo-specific freehub body. Most direct-drive trainers come with a freehub body compatible with 8 - 11 speed Shimano and SRAM road cassettes, so in many cases you will need to swap out the trainer’s stock freehub body before installing a 12 speed cassette. Some bikes are equipped with a 12 speed cassette on the rear wheel. To install the cassette, please see our guide to Installing a Cassette. Ideally, the brand of the cassette should match the brand of your rear derailleur.You can count the teeth to be sure, or look for the number stamped on the cog. The gear range should also match (“11-28” means the smallest cog has 11 teeth, and the largest cog has 28).The number of speeds should match what’s on your bike.If you’ve purchased a trainer where the cassette is not included, we recommend you purchase a cassette that closely matches what’s on your bike’s rear wheel for the best shifting performance and compatibility with the rest of your drivetrain. Here is our guide to Direct Drive Trainers. With 12 speed drivetrains occupying the top tier of the bike industry, I thought I’d add this post on how to select cassettes. Most direct-drive smart trainers on the market are designed for road bikes with anywhere from 8 to 11 speed gear cassette on the wheel.
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