With a planned launch later this month, OneUp Component’s showing of their new narrow-wide chainrings for Shimano XTR M9000 came a bit early following this morning’s announcement from competitor Wolf Tooth.
Made from the same 7075-T6 alloy as their other rings, these are anodized to color match the new XTR group. They’re made using the 96mm BCD and asymmetric bolt pattern of the new group, too.
So, what’s the difference between this and WTC’s offering? Beyond the tooth profile and color, it’s the hardware: OneUp’s will come with M9 bolt hardware that threads directly into the chainring. That’s compared to the M7 bolts that come stock with the XTR cranks, and the number refers to the bolt diameter (so, 9mm versus 7mm).
Jonathan Staples, OneUp co-owner and product designer, says this larger diameter fills the hole in spider instead of relying on the alloy nuts used with Shimano’s rings, so it gives the bolts better strength and pulling/holding power. It’s also lighter, saving a claimed 35g over the stock 1x chainring.
Like WTC, the chainline gets “corrected” from 50.4mm to 49mm. Staples says that change is primarily a wear issue, that as you’re fully crossed up on the biggest cog, you want the chainline a bit closer to that end of the cassette. It’s not as critical on the 11t cog, so they bias it toward the 42.
Weights are in the 40g to 50g range, and tooth count options are 30, 32 and 34 for now. If demand dictates, they’ll go for a 36. Available February 20th for $65 each, including hardware.
UPDATED: More pics and details below…
Here’s what you save by ditching the stock covers.
30T – 43g
32T – 48g
34T – 57g