Generally the lower the grip levels the more worthwhile it may be, could be a wet weather option!?
Used a set of skinny rears in the wet when I used to do kart racing growing up, in the dry I'd be 4th or 5th usually, in the wet with those bad boys destroyed everyone every time (I was the only person with a set, they were a bit "unusual")! Till they banned them, bastards!!
In wet/snow it helps cut through the surface moisture by having more weight per contact area, but not sure how applicable it would be to any conditions rc runs in? Can't see it helping in grippy conditions as the extra rubber on the track helps as long as the track top surface is as grippy as the ground immediately underneath (unless you want to decrease rear grip?)
Would also decrease friction so reduce battery use and help acceleration (if not wheelspinning).
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