Crank FAQ
Is ISIS compatible with Shimano’s splined system?
No, they are two different systems.
What size bottom bracket do I need?
For a standard MTB setup a 113mm axle is needed for ISIS or square taper.
Middleburn cranks run a 48mm chain line for cross country and 50mm for downhill.
However, there are far too many variables to always be able to predict what bottom bracket you need. BB-mount ("E-type") front derailleur and chain devices can and a lot of oddly designed frames. If in doubt have your local bike shop to fit your cranks.
ISIS bracket: 113mm
Square Taper: 113mm
What crank length is best for me?
Please see our page on choosing the correct crank length, click here.
What is Q-Factor?
Q-factor is the width between the left and right cranks.
What tool do I need to Remove
my Middleburn Spider from my cranks?
You need a Shimano bottom bracket lock ring tool (TL-UN96) or equivalent make.