Joined: Fri Oct 08, 2004 09:01:33 Posts: 1702 Location: Hampton/Va Beach USA
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I would suggest 18-21 with rubbers, depending on grip and layout. Lower sizes for high grip and/or tight layout. For foams I'd go up one to three teeth depending on diameter.
With 84t spur and 63mm rubbers, ratio & rollout calculations:
pinion / internal ratio / rollout
18t / 7.933 / 24.948
19t / 7.516 / 26.344
20t / 7.140 / 27.720
21t / 6.800 / 29.106
With 84t spur and 60mm foams ratio & rollout calculations:
18t / 7.933 / 23.760
19t / 7.516 / 25.080
20t / 7.140 / 26.400
21t / 6.800 / 27.720
22t / 6.491 / 29.040
With 84t spur and 58mm foams ratio & rollout calculations:
19t / 7.516 / 24.244
20t / 7.140 / 25.520
21t / 6.800 / 26.796
22t / 6.491 / 28.072
23t / 6.209 / 29.348
With 84t spur and 56.5mm foams ratio & rollout calculations:
20t / 7.140 / 24.860
21t / 6.800 / 26.103
22t / 6.491 / 27.346
23t / 6.209 / 28.589
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