Cassettes

Cassette Buying Guide

The cassette defines your gear range — how easy your easiest gear is and how fast you can pedal on the flat. Modern 1x drivetrains rely on wide-range cassettes (10-51T or 10-52T) to compensate for having a single chainring up front.

Speed Count and Range

10-speed cassettes (11-42T typical) — adequate range for most trail riding but the gear jumps between sprockets are larger. 11-speed (11-46T or 10-46T) — the sweet spot of range and gear spacing. 12-speed (10-51T Shimano, 10-52T SRAM) — the widest range available, with a genuine climbing gear and tighter spacing between gears. For new builds, 12-speed is the standard. For existing bikes, upgrading from 10 to 12-speed usually requires a new shifter, derailleur, chain, cassette and potentially a new freehub body.

Freehub Compatibility

This is the most common compatibility trap. Shimano HG (Hyperglide) fits most 10 and 11-speed cassettes. SRAM XD (XDR) is required for SRAM 12-speed Eagle cassettes. Shimano Micro Spline is required for Shimano 12-speed cassettes. Your hub's freehub body determines which cassettes you can run. Some hubs (Hope, DT Swiss, Industry Nine) offer swappable freehub bodies — buy the right freehub driver for your cassette choice.

Materials and Weight

Steel cassettes are heavy but durable — Shimano Deore 12-speed (CS-M6100) weighs around 470g but lasts well. Alloy and titanium sprockets on higher-end cassettes (XT, XTR, SRAM XX1) reduce weight significantly (down to 230g for XTR) but wear faster and cost substantially more. For most riders, mid-range cassettes offer the best value — SLX or GX Eagle hit a good weight-to-durability ratio. Save the lightweight cassettes for race day.

When to Replace

A worn cassette causes skipping under load — the chain rides up over the worn teeth instead of engaging cleanly. If you replace a chain and it skips on the cassette, the cassette is done. Replacing the chain on time (at 0.5% wear) extends cassette life significantly — you should get 2-3 chains through one cassette if you stay on top of chain replacement.