I just put these on as summer tires and auto-x tires and the traction after they warm up a little bit is awesome. I used to have trouble even with the F1s spinning in second sometimes. With these I get pretty zero under hard acceleration.
I run my 615r for my daily and on auto cross. One HELL of a tire. The wet grip is amazing. The dry grip is even better. I have yet to break them loose in an autox event. There are gobbs and gobbs of grip. Plus the tread is meaty from the get go.
I have a set on one of my Corrados and LOVE them. I've only had them for about 3000 miles so far, but dry grip/handling is amazing, and wet grip really isn't too bad at all. Standing water I would take it a bit slow, but even on a wet road after the rain, they grip/handle pretty well.
The tires are great in the rain, great in the dry, quiet and give a good ride quality. People have had bad luck with bubbles, yes, but I had no such luck in the past.
They're excellent tires in wet & dry conditions, but as other people have mentioned, they're very prone to sidewall issues and tend to bubble.
Goodyear Eagle F1 GS-D3 225/40ZR18 Excellent wet tire traction and durability. After 20K miles, they begin to lose their good aquatic capability. Medium to Low noise. Good-Excellent grip with less than 20K miles on them
I rolled the rt-615 and loved them, More grip than I ever needed/used.
Compared to the stock 18s, I'm quite pleased to announce that the 22s actually ride as nice if not better. Part of this may be their 73lb/corner weight (not much over stock but still not as light). It floats a bit more than stock, but even with the low-profile tires, its not harsh.
Not much noise, but have seen an uneven wear pattern, even with periodic tire rotation. For my Passat, at least, the rear tire position begins to create a "finned edge" to the shoulders of the tire.
Bridgestone Potenza G009 195/50/15 (horrible crap tires)
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