used to have an rc18b with an outrunner integrated into the centre shaft, also have a small drag rail with that setup, it works very well but you do need a higher rated speed control and good batteries because startup currents are VERY high. both are/were very smooth to drive, but very limited by the gearing, or lack of. not too bad onroad with foams i suppose because you can true your tyres to get suitable gearing. by the way, you want a really smooth mardave, try a keda 450h 3200kv outrunner, really good to drive!!
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