SHIMANO 110BCD R9100 R8000 R7000 2X Completely closed Round Road bike

Which size of an oval should I choose

We always recommend swapping like for like, so if you have a 32T round ring at the moment, you should consider getting a 32T oval. The same applies to our shiftable road ovals, we recommend that you purchase ovals with the same teeth count as your round rings.

How to calculate gear inches for an oval chainring

Exactly same way as for round chainring. You just need to use the nominal size in the calculation of an oval ring you have. That is, if you buy 32T oval you use for calculation 32T size. Reason for this is 32T oval chainring has same circumference as the 32T round. We optimize the shape but not circumference - it stays constant. Distance between each teeth always has to remain at 12.7mm to engage the chain properly. You can use any online calculator to get gear inches for an oval chainring.

Model	48-35T or 50-34T or 52-36T or 53-39T or 54-40T or 56-42T
Colour	Black
Made from	7075-T651 Aluminum Alloy
Surface coating	Anodizing
Made with	CNC milling
Chainring shape	Round
Compatible cranksets	SHIMANO R9100 R8000 R7000
Weight, grams	162 (48-35T), 170 (50-34T), 190 (52-36T), 207 (53-39T), 233(50-40T), 242 (56-42T)
Chain compatibility	Standard 11/12 speed

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SHIMANO 110BCD R9100 R8000 R7000 2X Completely closed Round Road bike Gravel bike 11-12S