by slothead » Wed Mar 13, 2019 6:22 pm
I totally agree with Harry - the easiest, quickest, and likely cheapest upgrade that can be done for an RTR car is silicone or urethane tires. BUT, that can start what I refer to as an arms race - once one or a few cars have aftermarket tires they can outperform all the other cars such that they need new tires too.
When I first starting building dirt modified cars for my oval I ordered 4 pairs of AML rear wheels & tires from Professor Motor because I loved how wide they were. Silicone over foam didn't mean anything to me at the time, but the cars I put them on were in a class by themselves. Gradually every car in my top series had to be upgraded to these types of tires. Though not nearly as sticky, I upgraded all the other series to standard silicone - either Maxx Trak or now Quick Slicks. No car on stock tires can keep up.
Same for my road course cars, they now all have PG urethane tires. PGT's are reasonably priced, but I've now bought about 100 pair and keep extras in stock so if I buy a new car I have a set ready to put on it. When I do buy a pair for a car I generally buy 2 or 3 pair to maintain an inventory.
Is upgrading to aftermarket tires worth it? Yes, and more for handling than speed. But, once you put some on a car or two you're likely on the path to a complete changeover.