Hope oval spiderless retainer ringthe oval spiderless retainer ring is specifically designed for use with hope's own cranksets and opens up a wide range of tooth count options compared to the standard 4 bolt type. Its specifically tuned 12% ovality helps to smooth out your pedalling action and make those extended climbs to the top of the trails less painful. Also, when you're on the way back down again, you'll enjoy excellent chain retention thanks to its narrow wide tooth profile. When used along with a clutch style rear mech, you don't need a chainguide, so overall weight is reduced and your drivetrain runs quieter and with less drag.the oval spiderless retainer ring is cnc machined from 7075 t6 aluminium and provides the perfect blend of low weight and strength. It's compatible with 1x10, 1x11 or 1x12 speed drivetrains and has a hard anodised finish, which provides lasting durability in all conditions.features material cnc machined 7075 t6 aluminium finish anodised speed 1x10, 1x11 or 1x12 speed mount type direct mount for hope cranks bolt circle diameter bcd direct mount 12% ovality and 113 deg clocking oval direct mount retainer ring designed specifically for hope cranksets narrow wide tooth profile means no need to run a chain device allows the use of a wide range of tooth count options saves weight without the need for a separate spider provides the perfect blend of lightweight and strength offset to give the perfect chainline quieter drivetrain and reduced dragsold individually weight 28t 57g 30t 63g 32t 68g 34t74gplease note not suitable for use with shimano 12 speed quick links.buy hope components from chain reaction cycles, the world's largest online bike store.