1250kv with a diff ratio of 2.5:1 was good in an rc18 with tc tyres on, motor was modified to be part of the centre shaft. for a tourer you could go a bit higher, try 1500kv or something, outrunners do like to be geared hard. one word of caution, start up current is quite high so make sure your speed control and batteries can handle it. the rc18 used close on 2ah in 5 mins with centre shaft mounted outrunner, under 1300 with a brushed motor, similar top speed, acceleration not comparable though. the 1250kv outrunner (28mm by 20mm) is now in the back axle of a 15" long drag rail, direct drive to 1/12 scale foams, peak current on 11.1 volts exceeds 60A if you can find enough grip to give it some throttle!
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