I know MT recomends the ET Street SS for more street than track. Vice versa with the ET Street R. The R tire uses the same compound as the Pro Bracket Radial so it is better for marginal prep.
That's why I bought Rs to replace the S/S since I swap 'em out for normal street use anyway.
I didn't realize my S/S had that much tread left (at least 3/32) until I pulled 'em off the last time, so I'd rather get my money's worth if they're not losing grip. I'll see if shorter burnouts make any difference, too.
