I think Bedworth have it spot on!
We are introducing 17.5 as our stock class as many drivers are on the limit with new ESC's and 13.5, and this is even more pronounced as we race indooors.
It's not a power issue or even a speed issue.... my WGT ususally is 1 lap up on the best 13.5 TC times over 5 mins and I have half the energy (1s LiPo) but run a 10.5 motor (and an old Novak GTB non timing esc). But as I have big foam tyres the car is easy to drive!
TC's on rubber are at the limit of adhesion and therefore very edgy. 17.5 takes this away and means it's back to driving skill rather than being able to keep on the edge and hope you don't bin it. Some of our very good drivers still make mistakes and a high speed off puts them to the back of the field from the lead...often caused by going over the esge on adhesion, not ability.
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