Shimano Deore XT FC-M8120-B2 Crankset

Specifications

• Model no.
  FC-M8120-B2
• Brand
  Shimano
• Series
  Deore XT
• Groupset
  Deore XT M8100
• Intended use
  Mountain bike
• Tier
  2 — High-End

  Tier levels (highest to lowest)

  1. Flagship
  2. High-End
  3. Performance
  4. Mid-Range
  5. Value
  6. Budget

  Learn more about our tier classification
• Weight (claimed average)
  668g

  This is the manufacturer’s claimed average weight; actual weights may differ.

• Front speeds
  2

  Number of chainrings on the crankset.

• Rear speeds
  12

  Number of cogs on the cassette.

• Chainring combinations
  36-26T
• Power meter integrated
  undefined

  Specifies if the crankset includes a built-in power meter. A power meter measures how much power the rider produces and sends this information to compatible bike computers.

• Crank arm lengths
  165, 170, 175 and 180mm
• Q-factor
  178mm

  Q-factor is the distance between the outside faces of the crank arms, measured parallel to the bottom bracket axle. A narrower Q-factor brings the pedals closer together, while a wider Q-factor spaces them farther apart.

• Chainline
  51mm

  Chainline refers to the distance between the centreline of the frame and the centreline of the chainrings.

• Bolt circle diameter (B.C.D. or P.C.D.)
  Direct

  The Bolt Circle Diameter (B.C.D.) or Pitch Circle Diameter (P.C.D.) is the diameter of the imaginary circle that passes through the centres of the chainring bolts. This measurement determines which chainrings are compatible with a crankset, as different B.C.D. sizes require matching bolt patterns.

• Spider arms
  4

  The number of arms on the cranskset spider connecting the chainrings to the crank arms.

• Compatible bottom bracket type
  Outboard

  Specifies the bottom bracket standard that matches the crankset.

• Shimano recommended bottom bracket for press fit
  BB-MT800-PA

  Shimano recommends this press fit bottom bracket for this crankset. There may be also be suitable thrid party alternatives.

• Shimano recommended bottom bracket for threaded
  BB-MT801

  Shimano recommends this threaded bottom bracket for this crankset. There may be also be suitable thrid party alternatives.

• Shimano recommended bottom bracket for threaded E-type
  -

  Shimano recommends this threaded E-type bottom bracket for this crankset. There may be also be suitable thrid party alternatives.

• Shimano recommended bottom bracket for threaded with chain case
  -

  Shimano recommends this threaded chain case bottom bracket for this crankset. There may be also be suitable thrid party alternatives.

• Shell width for threaded bottom brackets
  68, 73 and 83mm

  The shell width of a threaded bottom bracket is the distance between the two threaded holes in the shell.

• Axle length of BB-UN or BB-ES
  -

  Refers to the total length of the bottom bracket axle (also known as spindle), specifically for Shimano's BB-UN and BB-ES series.

• Over locknut dimension (O.L.D.) through axle
  148
• Over locknut dimension (O.L.D.) QR nut
  141
• Crank arm material
  Aluminum
• Crank axle material
  Steel
• Spider arm material
  -
• Hollowtech II
  Yes
• Hollowtech crank arm
  No
• Hollowglide
  No
• Two piece crankset
  No
• Option with bash guard
  No
• Option with chain guard
  No
• Option without chain or bash guard
  Yes
• Chaincase compatible
  No