He has 17's. His only option is a grippy 215/40/17 if he wants to maintain grip or a 245/35/17 FK452. Or you can run a tire that comes with less tread depth. According to Federal's website, the RS's come new with 8/32 tread depth and a height of 24.1" which is real short for a 235/40/17. This is the tire I plan on running up front next year on my track car. Hankook RS-2 come with less tread depth as well. Federal RS seems like the best bet though at 24.1". I've heard they are grippy as hell too. Just putting my nail into the tires you can tell that they are damn soft.
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