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XT FC-M8120 1x Crank Arms

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Why We Like The XT FC-M8120 1x Crank Arms

We may as well put ‘Deore XT’ in the dictionary as a synonym of 'quality'. These Shimano XT FC-M8120 Crank Arms are built for us to put them through the wringer. Seen on our cross-country and enduro bikes, they’re light enough for all-day trail use and durable enough for us to throw down on big park days. The newest XT offering is equipped with a cinch chainring to minimize creaking and weight while working with the latest and greatest Shimano 12-speed drivetrain systems.


  • Durable every-day and any-bike crank arm
  • Cinch chainrings install easily and are hassle-free
  • Upgraded crank arms for the 12sp Shimano family
  • Hollowtech+ is lightweight and ultra-durable
  • Dynamic Chain Engagement keeps 1x chains on the chainring
  • Item #SHIU1D7
Arm Material
Arm Length
165mm, 170mm, 175mm, 180mm
Chainring Sizes
28T, 30T, 32T, 34T, 36T
Bolt Circle Diameter
direct mount
BB Type
[recommended pressfit] BB-MT800-PA, [recommended threaded] BB-MT800
Q Factor
Compatible Components
DEORE XT M8100 Series
1 lockring, 1 preload cap, 2 crank spacers
Claimed Weight
[28t] 1lb 5.7oz (616g), [30t] 1lb 6.2oz (630g), [32t] 1lb 6.2oz (628g), [34t] 1lb 6.6oz (642g), [36t] 1lb 8.3oz (660g)
Manufacturer Warranty
3 years