With availability of big cassettes now as wide as their gear ratios, single-ring mountain bike set-ups are gaining more and more ground these days and with good reason: they provide almost as much gearing as their double ring cousins but are lighter, more reliable and less expensive. The On-One Ringmaster now provides the perfect chainring to complement a single-ring build.
Available in either 30T, 32T or 34T, the Ringmaster is CNC milled from 7075-T6 alloy and weighs in at 61g, 63g and 73g respectively on our scales. Thick-thin tooth profiling prevents chain drops without the need for a chain device, further reducing weight and increasing pedalling efficiency as well as limiting chain wear. A 104mm BCD (bolt circle diameter) makes the rings compatible with a wide range of cranksets.
Thick and sturdy was the impression I got -- 32t is 62g. Its 6mm thick, unfortunately the clearances on my Yelli Screamy are very close so it wouldnt fit on the middle position (Im running a bash ring) Also wouldnt fit on FC-M970 cranks outer position. So its ended up on my single speed and its improved the chainline -- so thats gotta be good. On XT FC-M752 cranks and Truvative FireEx carnks it will go on both middle and outer position no problem.
I got the 32 tooth version to convert a Shimano triple chain-set to a single ring. Very good quality and nicely finished. The bolt tabs are nice and chunky, so if using with a bash guard, you will need some longer bolts from the standard Shimano ones. The thick/thin tooth profile works a treat, no chain drops yet, with using a clutch type rear mech. No need for a chain device. Well worth the price, compared to the mainstream manufactures prices.