AMP frame BB axle length

That depends entirely on what crank you're running.

I've got a 107mm in mine with m900 crank.
 
Right, so if i was going to use Cooks or Grafton cranks could i use 107 or would i need wider ?

wider probably, I've not used any of those, I'm sure someone on here can advise.

eg. Toplines, which have very straight arms and would look cool on an amp, need 122.5mm.
 
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