Originally Posted by okfrancs
hey i am a bit confused about which tire compound to use. what is the proper set up, harder compound on the front or the rear? whats correct?
.....you'll get many answers.
But this is my tips :
1. You need access or own tire shaver. .... Normally front tires diameter is shave 2mm - 2.5mm smaller than rear tires, >>> to make front tires slightly underdrive, but still close to 1:1 ( full time 4 wheel drive effect ).
2. Test run your car for 15, 30, 45 minutes, and plz check the condition of four tires after that. Use caliper and write down the diameter of front vs rear after 15, 30, 45 minutes.
3. If the rear tires diameter become smaller than front, you need harder compound for rear tires.
4. If front tires become even smaller than rear, you need harder compound for front tires.
5. The goal : You want four tires to wear out very close to 1:1 or slightly underdrive after 15 min, 30 min, 45 min. The overdrive / underdrive chart is included in the car's manuals.
6. If track is abbrasive or very sticky, normally you can start with harder compound like 40, 42.
7. If track is normal or slippery, normally you can start with softer compound like 35, 37.
8. Always use fresh tires during testing and racing. That means : Finish using the tires in 1 day..... don't bring them home.
9. Don't buy old stock tires.... the foam is dry.
10. Keep your new tires inside air tight container, place them in cool place.