rear tyre shore
Tyre Shore - Rear - Information
On-road R/C racing tyres are rated by hardness or "shore". The harder the tyre rubber, the higher the shore number. A softer rear tyre normally gives more traction, but tends to deform more which can cause instability. Also, softer rear tyres wear faster than harder tyres (this is important to remember with a 4WD car for long races because rear tyre diamenter has a direct impact on overdrive, which in turn has an impact on performance and handling). Generally, it is better to use harder rear tyres (30 shore or harder) and find a chassis set-up (shocks, anti-roll bars etc) that makes the car easy to drive, rather than generate more grip using softer tyres.