How To Choose a Mountain Bike Drivetrain: Shimano vs. SRAM

Modern Mountain Bike Drivetrains: Shimano vs. SRAM

In the world of mountain biking, drivetrains have evolved significantly over the past decade. Simplicity, efficiency, and durability now lead the charge—and two major players dominate the scene: Shimano and SRAM.

1x Drivetrains Take Over

Gone are the days of triple or even double chainrings. Modern mountain bikes overwhelmingly use 1x (single front chainring) drivetrains, which reduce weight, simplify shifting, and minimize mechanical issues. This shift has been led by both Shimano and SRAM, each offering wide-range cassettes that provide all the gearing needed for climbing steep trails or bombing down descents.

SRAM: Innovation and Eagle Technology

SRAM set the tone with its Eagle series—available in NX, GX, X01, and XX1 levels. These 12-speed drivetrains offer a massive 10-50T (and now 10-52T) cassette range. SRAM uses a proprietary XD driver for many of its cassettes and relies on a roller bearing clutch in the rear derailleur to keep chain tension steady. The latest Transmission (T-Type) drivetrains mount directly to the frame’s UDH hanger and have redefined durability and precision.

Shimano: Smooth Shifting and Hyperglide+

Shimano responded with its 12-speed groupsets like Deore, SLX, XT, and XTR. What sets Shimano apart is its Hyperglide+ technology, which enables seamless up and downshifts even under load—perfect for technical climbs or racing scenarios. Shimano uses its Micro Spline freehub body for these newer wide-range cassettes, usually spanning 10-51T.

Electronic Shifting

Both brands now offer electronic shifting: SRAM AXS and Shimano Di2. These systems eliminate cables, offering precise, wireless gear changes and customization via apps. While still premium-priced, they’re becoming more common on high-end builds.

Which is Better?

It comes down to personal preference. SRAM tends to lead in innovation and wide-range gearing, while Shimano is favored for its silky-smooth shifting and reliability. Both offer excellent performance across a range of price points.