standard helix to roller

[sxr700]

how do the numbers from a standard helix transfer into a roller ?? what would a 45-39roller be equivalent..

 

[yamaholic22]

it depends on the exact manufactures for each component, but a general rule is to add 6 degrees to the roller numbers to get the equivalent for a button secondary.

 

[sxr700]

what angle of twist is recommended for a roller setup ??