Ratio Direct Mount Chainrings for SRAM 8 bolt and 3 bolt

Direct Mount Chainrings – Made in the UK

The Ratio Direct Mount Chainring is a solid spiderless chainring, engineered for SRAM 8 bolt and SRAM 3 bolt cranksets, offering a simple, secure solution for modern 1x drivetrains across gravel and road cycling.

CNC machined in-house by us in the Lake District, UK, each chainring is made with a focus on precision, durability and consistent performance.

Optimised Narrow-Wide Tooth Profile

Ratio’s custom tooth profile was developed to address common issues with 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

These chainrings are designed to work across multiple drivetrain standards, making them a flexible option for bike upgrades.

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

• SRAM 8 bolt direct mount chainring
• SRAM 3 bolt direct mount chainring
• Narrow-wide tooth profile
• CNC machined 7075 aluminium
• Made in the Lake District, UK

Weight: 34T – 75g, 36T – 85g, 38T – 90g, 40T – 105g, 42T – 110g, 44T – 120g, 46T – 155g, 48T – 160g

Bolts not included.

Chainline

For the older 3 bolt SRAM cranks, the offset is 7mm. The newer 8 bolt versions have a 8.5mm offset. Both of these give a 45mm chainline for use on road cranks. Offset is defined as the distance between the mounting face of the chainring and the centre plane of the teeth, so is independent of tooth thickness. Chainline is defined as the distance between the centre plane of the frame and the centre plane of the teeth. Please note that these figures may not agree with other aftermarket manufacturers’ due to varying definitions of offset, chainline and/or deviations from manufacturer recommendations.

Note: Check the maximum 1x chainring tooth capacity of your frame with the manufacturer. In particular, the 46T and 48T chainrings may not fit on your gravel frame.

*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.