There is work involved in maintaining brushed motors, most racers will skim the armature regulary, this is why brushless are popular, (£180+brushless esc & motor combi). as there are more brushless used, brushed motors are becoming good value secondhand (the V's, peak or orion & checkpoints £60ish new)
Advantage of the V's & checkpoints is the longer/better wear of the brushes, less maintainance, we found the checkpoints easier to solder to, but not much else in it. If you are racing at a local track it will be tires & suspension that make all the difference.
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