Rotax Sr. Gearing for Gingerman?

[Jahan]

I'm looking for a ballpark range, obivously it will be much different from MRP. Looking to optimize the amount of money and time spent testing different ratios . . .

[Bruce Woodrow]

Jahan,

I have run Rotax at Gingerman one time. Recommended gearing was 16/75 (I actually used 14/66 as I already had a 14 tooth driver). I would recommend getting a 16 tooth driver as chain/sprocket life will be better. Another more durable option is to convert to belt drive.

By the way, the same gearing is appropriate for Grattan too.

Bruce

[Eric Chappell]

O-ring chains work great for long track durability at a lower cost than a belt drive set-up.