Cranks replacement

  1. Find suitable interface: square, Octalink, ISIS Drive, Hollowtech II etc
    1. square can be diamond or square
  2. If you have your current Crankset:
    1. compare the leg length
    2. compare sitting depth
  3. Check the gears aren’t bent
  4. Check the sitting 47.5mm to 50mm to the middle gear is appropriate spacing between the axis of the bike tube and middle gear