RS-RR will have more grip without a doubt the price is quite good for what you get however keep in mind these tires are loud as shit like really really loud.
Reviews of FEDERAL tires
361 vote
Federal 595 RS-R. It's a very well priced tyre.
I have slightly stretched Federal RS-RRs that still grip as much as the meaty Hankook V12s I used to run. Very affordable, but I've heard they're very poor in the rain.
Federal FZ-201 M tires. They were as fast as my used Hoosier R7s on the same course. Ended up about 1 second faster on a 1:15 lap vs the R7s. Fairly communicative towards the limits. On Auto Cross they were very sticky.
federal rs-rr are decent but they do get greasy towards the end of your sessions.
Tires: Federal 595 rear / Cooper Zeon RS3-A front
I use them daily for about 2 years now in SoCal. Daily drive them. I do fine at track days on them and they lasted quite a long time. Now they are pretty loud however but eh kinda get used to them.
Federal RSRR. My last set lasted me 25k miles which included 4 track days and 2 auto xs
Note to self, don’t cheap out on tires. (Federal SS 595). These aren’t bad bad but for autocross they need to be better.
They are OK, but I don't prefer them. I've driven cars with them on and in the dry they are on par with the ADR-08s. I prefer the feedback and feel of the Hankook RS4's myself for the dry. That said, they are not good at all in the wet.
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