RC Buggy tires, How to make rubber tires last longer?

if they are solid rubber you could try using traction pegs (little metal studs that can be dug into the rubber to gain more offroad traction) to keep the rubber from wearing out and make your car much more "grippy" or if they are hollow pressurized rubber tires try using slime tire fixer it is a bit pricey but it will keep your tires from being destroyed when popped by fixing them almost immediately after they pop.
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