Our on-line store is open 24/7 and we ship Monday through Friday, excluding some holidays. Orders received for products without shipping restrictions on its product page will ship the same business day when received before 12:00 p.m. PST. Orders in high demand will have an estimated production time listed on its product page and will ship according to the date listed.
With its BEAM SPIDER construction, the XTR M9100 12-speed cassette shaves weight while increasing SHIMANO's MTB gearing range another gear. Using SHIMANO's new MICRO SPLINE freehub body and HYPERGLIDE+ tooth profile, these 10-45 and 10-51T cassettes deliver the best MTB shift experience on offer.
FEATURES
- Definitive shifting
Let you pedal continuously while shifting
Increased acceleration by reducing inertia and weight by BEAM SPIDER construction
- New MICRO SPLINE * construction to engage FREEHUB body
PRODUCT SPECIFICATIONS
- MODEL NO CS-M9101-12
- SERIES XTR M9100 Series
- Average weight 357 (10-45T) 367 (10-51T)
- Combination 10-12-14-16-18-21-24-28-32-36-40-45T | 10-12-14-16-18-21-24-28-33-39-45-51T
- Combination name (Group name) 10-45T 10-51T
- Type HYPERGLIDE+
- Compatible chain HG 12-speed
- Rear speeds 12
- Aluminum gear_QTY (pcs) 3
- Aluminum spider arm_QTY (pcs) 1
- MICRO SPLINE ✔
- Steel gear_QTY (pcs) 4
- Titanium gear_QTY (pcs) 5
We are a Seattle, WA based outdoor gear store with a mission to make climbing, backpacking, skiing & mountaineering accessible and enjoyable for everyone.
© 2026, Master Store