Best Nitto's?
The drag radials need a fairly low pressure to wear evenly, but they feel wobbly at high speed. For the front the 555's are not bad, but they don't have the solid feel at high speeds of the 555R2. If you don't care about 100+ mph and just keep it slow, the 555's are just fine for that. Don't cost much either.
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Now they aren't going to feel as solid as the R2 because the R2 is like I said, a handling tire with a stiff sidewall for cornering. They are not a drag radial and will not launch as well as the softer R tire.
I could maybe see you having problems if you have a 315 tire on a stock sized wheel (9-9.5") or are running lower pressure than you should be, but they should be stable at speed. Mine always have been all the way up to 100mph (beyond that, you shouldn't be making fast turns anyway).
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It's kind of like going from a poly/poly PHR to a rod/rod PHR. It gets rid of the slop in the the rear and the car goes straighter.
PS, I'm talking about the 100-130 mph range.



