Originally Posted by
cyclonetog
Do you have any more info?
Can you tell us the size of the track? Which club you run at?
Also can you post a speedo setup sheet?
Personally I don't run 21.5, but I do have a rough idea where I'd start.
The tracks and clubs vary allot from asphalt with 40m straights to Carpet with 20 metre straights been all round the houses with gearing but depending on the track I have found anything from 5.0 - 6.0 FDR works best