Shimano GRX Gets Bigger Chainrings and Shorter Cranks—Here's Who Benefits

Shimano just added 44T and 46T chainrings to GRX, plus 165mm and 160mm crank arms. If you're running a gravel bike on mostly pavement or racing fast events, the bigger rings matter. If you've been sizing down cranks to clear suspension or improve hip angles, now you don't need an aftermarket solution.

The new chainrings work with existing GRX cranksets—both 1x and 2x, across 600- and 800-series groups. That's useful if you built up last year and don't want to swap the whole crank. The 46T option is aimed at riders holding high speeds on flat gravel or mixed-surface events where a 40T or 42T leaves you spinning out. Here's the catch: if your typical ride involves sustained climbing or technical singletrack, you're not the target. A 46T paired with an 11-34 cassette still bottoms out around a 36-gear-inch low end, which is fine for Iowa but punishing in Vermont.

The shorter cranks (165mm and 160mm) are more interesting from a fit perspective. Shimano's framing this as "expanding fit options" and "supporting higher cadences," which is vague but not wrong. Shorter cranks reduce hip flexion at the top of the pedal stroke, which can help if you're dealing with impingement or running a more aggressive position. They also improve ground clearance on technical descents and in corners. The tradeoff: you lose some leverage, so if you're grinding steep grades at low cadence, you'll feel it. I can't verify whether the GRX-specific finish justifies the cost over third-party options like Praxis or Absolute Black, but if you care about matching aesthetics or warranty simplicity, it's now an option.

One thing Shimano didn't address: chainring availability for the 1x12 Di2 group that launched last summer. If you're running that setup and want a 46T, you'll need to confirm compatibility before ordering. The press materials say "existing GRX cranksets," but I'd double-check with your shop if you're on the newest wireless stuff.

The CUES 2x11 update is less relevant unless you're building a budget road bike, but the 11-36T cassette range is worth noting if you want a wide-range setup without going 12-speed. It's Hyperglide, so shifts should be clean, but this is a different conversation entirely.