How many meetings are you getting from a set of tyres?
with 2WD i run yellow minipins on carpet and get 4 meetings before they are too bald to correct with driving, 4 rounds plus 10 mins practise at each meeting.. thats just rears, fronts last 2/3 meetings longer.
If you are on a budget then reusing wheels and inner foams is easily done, i race on a budget and at club level am as tight as can be...
roughly £2 a meeting for tyre wear is good value i think, considering the performance and costs of equipment and the car, there is no point having the tuning options or fast motors etc without required grip.
For astroturf i would use either Schuey green minispikes if dry or Ballistic green minispikes if damp on back depending on thickness of astro and yellow staggered ribs or green minispikes on front, staggers last a lifetime and you'll get a fair few meetings out of rears.
Fastrax do cheaper minispike tyres, maybe one of their range would be suitable for your surface?
Foam tyres could be an option, used to race buggies on tarmac years ago and they lasted quite well, great on carpet but fitting and trueing is a messy job!
Another tip... if you race at tracks that lap the track in same direction each meeting... swap tyres over side to side between heats, evens out the wear on spikes/pins.
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