Riders with a 2x9 mountain bike and a 148 mm thru-axle or 141 mm quick-release rear end who want a 175 mm crankset with a low 22T gear for climbing.
This is the FC-MT210-B2, a 2-piece 9-speed crankset with a 36-22T double chainring combination and 175 mm arms. The arms are anodised aluminium on a plated steel axle, the chainrings are painted steel, and a crank fixing screw is included. Shimano lists it for smooth, precise front shifting with a narrow 176 mm Q-factor.
The B2 has a 3 mm outboard chain line (51.8 mm), made for frames with a 148 mm thru-axle or 141 mm quick-release rear hub, so it is not the same as the standard FC-MT210-2. It runs on an HG 9-speed chain and needs an outboard bearing bottom bracket. Shimano recommends the BB-MT501 for threaded 68 or 73 mm shells, or the BB-MT500-PA for press-fit.
36-22T rings
A 36T outer and 22T inner chainring on a 9-speed drivetrain, with a low gear for steep climbs.
3 mm outboard chain line
A 51.8 mm chain line, set out 3 mm for 148 mm thru-axle or 141 mm quick-release rear ends.
2-piece build
Anodised aluminium arms on a plated steel axle, with a crank fixing screw included.
Narrow Q-factor
Shimano lists a narrow 176 mm Q-factor for comfortable pedalling on the trail.
Crankset
Build and fit
HYPERDRIVE
Shimano's shift-focused chainring design, listed for smooth and precise front shifting.
Great for
Maybe not for
This listing is the 175 mm arm length; Shimano also makes the FC-MT210-B2 in 170 mm. Check your rear hub width and your bottom bracket type before ordering. The crankset needs an outboard bearing bottom bracket, and it is not included.
Match the crankset to your rear end
The B2 sits its chain line 3 mm further out than the standard FC-MT210-2, so it is meant for 148 mm thru-axle or 141 mm quick-release rear hubs. On a 142 mm or 135 mm rear end Shimano lists the standard -2 instead. After fitting, check the crank fixing screw is tight, the front derailleur is set for the 36T and 22T rings, and the chain runs cleanly on both.
