why 18'' wheels more popular on track?

Originally Posted by Red__Zed

This is the tech section, not off-topic.

The physics behind the performance of tires is a valid component of why smaller wheels are used more frequently on the track. MOI is about 25-40% less on an 18 as compared to a 19 on the wheels I've examined in the past. You can check that pretty readily as a 10kg disk with a 9" diameter has an MOI about 11% lower than a disk with the same weight and a 9.5" diameter. It is a consideration for those that are using this subsection for it's intended purpose.

If you want to pick on the dude, that's between you, him, and the forum admins. But please keep it out of the tech section.