Keep the questions rolling in, we are here to help :-)
50-70mm/rev seems about usual for most brushless systems. At my local clubs (where everyone uses 1s/12.5t or 2s/21.5t) we run on tracks that vary in size from 10x15m to 12x22m. Track layouts vary from week to week but we usually manage 28-32 laps in the standard five mins. The lowest roll out I have seen reputable drivers using on a regular basis has been around 58mm/rev and the highest is around 66mm/rev but it depends on their motor and speedo, as well as track size and layout. Personally, I run around 62mm/rev with my Dynamite motor and HW 1s speedo and a pinion lower if I use 2s/21.5t.
It has been several years since I saw anyone running a competitive 4cell and silver can motor. From what I remember they geared a couple of teeth lower than the brushless runners did - the higher 4cell voltages still give less rpm than modern 13.5t brushless motors and silver can motors have much less torque too.
Depending on your exact track size and layout I would suggest starting somewhere in the mid 50s mm/rev and be able to go up and down around that.
James
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James Garrett - BRCA GT12 Rep
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