Quote:
Originally Posted by dhdrider
180/55 is prefect for the street. If you find that you cannnot get a 180/55 tire that will give you enough traction for the street, you really need to take it to the track. 
I actually always ran 180/55 on the track as well, but a 190/55 would be a better choice.
A 190/50 is the worst choice of all.
Here's a visual aid for those wondering...
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one thing not calculated into that is the 180/55 being mounted on a 6" wheel instead of a 5.5" wheel.