What price to pay for a good chromoly GT frame like Avalanche, Bravado or Karakoram?

[minor_LEGEND]

Cranks tend to have a optimum b/b width & is specc'd by Shimano. From memory old MT60 (DX) & XT M730 are 127mm for example. Black LX 560 is 110mm as modern cranks took on a lower profile. Throw in 68mm/73mm shell widths & differing frame design & things are not set in stone, but it is a starting point for most applications. The correct question should be which axle length do I need for 'X' crankset?

 

[Black_puma]

Cranks tend to have a optimum b/b width & is specc'd by Shimano. From memory old MT60 (DX) & XT M730 are 127mm for example. Black LX 560 is 110mm as modern cranks took on a lower profile. Throw in 68mm/73mm shell widths & differing frame design & things are not set in stone, but it is a starting point for most applications. The correct question should be which axle length do I need for 'X' crankset?

Thanks for your input.
127mm length seems excessively long, I have a 120mm long BB for the Bravado and even that seems long, But I'll have a play around with a couple of bottom brackets once I get a chain and cassette fitted. According to the Sheldon Brown website it recommends a 122mm length spindle/axle for the MT60.