Originally Posted by jag88
Does anybody know how we ended up with the diameter and width of tire we are currently running? It would nice to have a wider and maybe a smaller diameter tire ........ yea I know, new tooling cost would be HUGE .
Back in 1995 we used to run 26mm and 30mm tires. The wider tires just added rolling resistance so guys started running 26mm tires all the time.
Yokomo figured out that you could make the car turn harder and reduce the rolling resistance even more by going to 20 and 22mm tires. Their 22mm Medium Sprints were awesome back in the day. The problem is that they looked goofy...like a car with motorcycle tires on it.
ROAR and IFMAR got together and said to make the car look more scale 24mm was the narrowest legal tire. Since narrower tires were always faster all modern racing tires are 24mm.
Tamiya made the first sedans. They set the standard for rim and wheel diameters. The first racing tires were 68 to 67mm in diameter. HPI went a little lower profile with its Super Radials and Belted Slicks and Yokomo went a little smaller with its Hot Laps tires.
Most modern racing tires are 66-64mm in diameter. Sorex are the biggest of the top level racing tires and Take Off's RP's are the smallest in diameter.