PASS QUEST SPRILL R800 R7000 3mm offset (4-bolt AERO) Round Narrow Wid

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	40T or 42T or 44T or 46T or 48T or 50T or 52T or 54T or 56T or 58T
Colour	Black or Silver
Made from	7075-T651 Aluminum Alloy
Surface coating	Anodizing
Made with	CNC milling
Timing	108° after TDC (top dead center)
Chainring shape	Round
Compatible cranksets	SHIMANO 110 BCD (4-bolt AERO) R8000 R7000 R9100
Weight, grams	64 (40T), 73 (42T), 90 (44T), 102 (46T), 113 (48T), 125 (50T), 139(52T), 159 (54T), 172 (56T), 188(58T)
Chain compatibility	Support 9/10/11/12 speed Ordinary chain

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PASS QUEST SPRILL R800 R7000 3mm offset (4-bolt AERO) Round Narrow Wide Chainring