Ratio 4 Bolt 110 BCD Chainring for Shimano GRX

4 Bolt 110 BCD Chainrings for Shimano GRX* – Made in the UK

Our 4 Bolt 110 BCD chainring is designed to mount on 1x Shimano GRX* cranksets. The chainring features an asymmetric 4 bolt mounting pattern at 110 BCD.

We CNC machine each chainring from 7075 aluminium in-house in the Lake District, UK.

Optimised Narrow-Wide Tooth Profile

Ratio’s asymmetric tooth profile was designed to improve the performance of narrow-wide chainrings, particularly when riding off road.

Key features include:

• Reduced wear on both chain and chainring
• Improved chain retention on rough terrain
• Controlled chain movement minimising “wave” behaviour
• Consistent, quiet engagement under load

You can read more about the engineering decisions behind our Ratio tooth profile by reading our article Design notes: Ratio Chainrings.

Broad Drivetrain Compatibility

Our asymmetric 4 Bolt 110 BCD chainrings for Shimano GRX* are designed to have the broadest possible compatibility across 11, 12 and 13 speed drivetrains.

Compatible with:

• SRAM Eagle* 12 speed chains
• SRAM Flattop* 12/13 speed chains (including T-Type*)
• Shimano HG+* 12 speed chains
• Campagnolo Ekar* 13 speed chains
• All major 11 speed chains

Key Features

• 4 Bolt 110 BCD fitment for Shimano GRX* cranksets
• Narrow-wide tooth profile
• CNC machined 7075 aluminium
• Made in the Lake District, UK

Weight: 34T – 48g, 36T – 56g, 38T – 68g

Bolts not included.

Additional Information:

The 36T and 38T chainrings use the same offset as original Shimano GRX* chainrings. Our 34T chainring is 0.9 mm further inboard to provide clearance with the crank spider.

*Campagnolo and Ekar are registered trademarks owned by Campagnolo. Shimano, HG+ and GRX are registered trademarks owned by Shimano. AXS®, DoubleTap®, eTap®, SRAM®,SRAM APEX®, SRAM EAGLE®, SRAM FORCE®, SRAM RED®, SRAM RIVAL®, X0®, X01®, XX1® are registered trade marks owned by SRAM, LLC. Eagle™, Exact Actuation™, GX™, NX™, SRAM APEX 1™, SRAM Force 1™, SRAM RIVAL 1™, S-series™, SX™, WiFLi™, X-Actuation™,  XD™, XDR™, XPLR™, XX™, Zero Loss™ are trademarks of SRAM, LLC.