Shimano XT RD-M8100-SGS Rear Derailleur

$145⁰⁰

RA price match promise
Pay later with , and

Color

Black

Typically ships within 5-8 business days.

Shimano | SKU: IRDM8100SGS | Option: Black

This product is HSA / FSA eligible

Pickup available at RA Cycles - Brooklyn

Usually ready in 24 hours

Questions about this product?

* Product image may vary. Refer to the description for accurate details.

Shimano XT RD-M8100-SGS Rear Derailleur Info

The Shimano XT RD-M8100-SGS Rear Derailleur sits at the core of Shimano's 12-speed 1x mountain drivetrain — built from aluminum, designed for riders who want XTR-tier shifting logic without the weight penalty of carrying a slack, imprecise derailleur through technical terrain. The SGS long cage handles cassettes up to 51T, making it well-suited to steep climbs and big-range setups.

Shimano's integrated stabilizer mechanism reduces chain slap and resists drops on rough, choppy trails — the kind of riding where an unsuppressed chain costs you momentum and focus. The 13T oversized pulleys improve chain efficiency and tracking across the full cassette range, while a cage bumper absorbs impact and keeps shifts quick even after hard landings. Tension management across the gear range is designed to keep engagement smooth in both the largest and smallest cogs, reducing that slack feeling in easier gears that plagues lesser derailleurs.