Drive shaft

[LIS20]

What is the recommended - or most commenly used -drive shaft length for a 2009 black front rocket with a bert transmission? Yhanks in advance.

[96racing]

If I'm not mistaken it is 38" for standard Bert, 38-1/2" for a ballspline (a 38" will work), and 35-1/2" for a Brinn