I'm setting up a speedohealer on a 5PW R1 engine. Car has 195/50/15 tyres and a 3.62 diff. Geared for 122.2mph according to Chris Gamlin's spreadsheet.

Based upon the bike's theoretical maximum of 180.5mph I'm calculating a 32.3% reduction needed. Anyone know different? TIA.

TVM. In and working fine it seems!