5 Bolt 110 BCD Chainrings – Made in the UK
The Ratio 5 Bolt 110 BCD Chainring offers a dependable solution for 11, 12 and 13 speed 1x drivetrains across gravel and road cycling.
We CNC machine each chainring 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 in our article Design notes: Ratio Chainrings.
Broad Drivetrain Compatibility
As with all of our chainrings, our 5 Bolt 110 BCD chainrings 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
- 5 Bolt 110 BCD standard fitment
- Narrow-wide tooth profile
- CNC machined 7075 aluminium
- Made in the Lake District, UK
Weight: 34T – 43g, 36T – 52g, 38T – 69g, 40T – 72g, 42T – 82g, 44T – 89g
Bolts not included.
*Campagnolo and Ekar are registered trademarks owned by Campagnolo. Shimano and HG+ 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.
Gavin Savage –
Brilliant,! Like pretty much everything ratio make. I rarely leave reviews but the simple chainline adjusment has made the world of difference to my sram force 1x (with ratio 12 speed coversion).