Ratio Ring – 38t 12/13 speed, 5 Bolt 110 BCD


5 bolt, 110 BCD chainring for 13 speed Campagnolo Ekar™ or 12 speed SRAM Flattop™ and Eagle™ chains. Made in the UK.

9 in stock

SKU: 0018 Category:

The Ratio Ring is the first aftermarket chainring option to be compatible with Campagnolo Ekar™ 13 speed chains, and features a tooth profile that can also be used with SRAM’s Flattop™ and Eagle™ 12 speed chains.

We’ve designed an asymmetric tooth profile that allows one roller to react all the load from the slack side of the chain. This helps manage the disengagement of the chain even when it’s stretched, and secures the lower span of the chain while freewheeling over rough terrain – preventing the “wave” behaviour that can otherwise cause the chain to jump off the teeth. At the tight side, the narrow-wide profile ensures the chain engages smoothly during pedalling and a chamfered seating curve helps to clear debris.

The tooth profile is adapted to engage with SRAM’s 7.9 mm Flattop™ rollers without compromising the kinematics of standard 7.7 mm rollers.

The Ratio Ring is designed and manufactured in the UK from 7075 aluminium.

Weight: 38t – 56g.

Bolts not included.

Weight 56 g
Dimensions 20 × 20 × 1 cm
Chainring Size

38 tooth


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