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Thanks Harry!! Much needed. :handgestures-thumbup:

Harry that is VERY helpful! I always struggle with remembering what the letters mean - nice to have a handy reference right here on HRW! :)

I have a monitor screwing up. Is this info different from what has been his system? It more trouble than its worth to scroll back and forth to read three letters at a time.

Nothing different. I just get asked about it a lot and thought newcomers and others would like to have it.

Thanks, glad it's helping some of you.

Bump.



Here is another graphic as well. Been a couple years, but simply taking the time to measure your wheels will give you the data you need to find the right tire.

Also remember that because urethane is easily sanded, you can reduce width and diameter.

For example, I almost always use a tire that is 1 mm over size in diameter. So if the stock size is say 20105, I purchase 21105. This is because I will sand the tire to make sure it is true, and doing so normally reduces that diameter to right where I want it. Easier to take away than add to.

Same with width. Many times we try and fit the widest tire we can to gain the most contact patch of tire to the track we can. Sometimes the insides of the tires might rub the chassis on some cars. I simply use a Emery board and sand/profile the insides so they clear.