The creation of a direct-mount, narrow/wide chainring isn’t revolutionary, but is news coming from crank & ring maker Middleburn. Long known for their long-lasting forged aluminum cranksets with classic aesthetics, this is the first real update we’ve heard since machinists BETD took over British production of the Middleburn range a year and a half ago.
Middelburn Boost UNO TT direct-mount 1x chainrings
BETD is moving forward, albeit not at a lightning pace, now adding a Boost-spaced UNO TT direct-mount chainring option for at least the most modern oversized axle/external BB versions of those classic Middleburn cranksets.
Their latest £80 Boost UNO TT rings are made to fit on the latest generation of 3-piece X-type (external bottom bracket) RS8 mountain bike cranksets, offering a 53mm single ring chainline. The 7075 T6 alloy TT rings are CNC-machined in Staffordshire, England, designed for modern 1×11 & 1×12 drivetrains with a tall narrow/wide tooth design BETD calls Thick Thin (hence the TT, not for time trialing.)
The Boost rings are only being offered in 30 & 32T sizes for now, and all get a black hard anodized finish. A £64 Boost 104 BCD 1x spider is also still available for those needing more gearing options.