I'm currently running RPF1's on 225/45/17 and 255/40/17 Kumho MX's. I used to have Sumi htrz III's before but I swapped them out for the kumho's because they felt a little soft in the sidewalls when auto-x'ing. I recently went back to my stocks the other day and I noticed how much more "precise" the inputs were on the stocks, so much so that I think I'm going to try going back to my stocks for the next auto-x event. My question is whether or not for my next set of tires (for the enkei's) if I should go down to the stock tire sizes (likely on the dunlop sportstars) or stay with the "plus size." I haven't played too much with the tire pressures yet so I also have that as an option on the enkei's if i run them at the next event. Just wanted opinions on the tire sizing before i get impulsive and try something else.

 

oh and on another note... i tried the OEM 215/245 tires on the RPF1s before but i didn't like the overly stretched look on the fronts especially so I opted to go wider. but reading and comparing it seems the oem 215's are narrower than a lot of other 215s.

 

bump

 

def go with the 225/255 . The dunlop star specs are a great tire i just got the same exact tires nounted on my Rpf1s and i love them . If you look at what size rim is tested with 225/255 its 8 front 9 rear . Smaller is going to stretch and have a smaller contact patch. hope im right good luck

 

Yep the 215/245 combo is much more precise feeling then the 225/255 combo on 17x7.5-17x9 similar sized rims.

 

anybody ever run a 225 or 235 (fronts) / 265 (rears) on these?

 

my friend runs 17x8 all around on his Si with a 235 Dunlop sportstar spec

 

There are only a couple of tires that run 265 on a 17 inch wheel, the only decent performance tire being the michilian pilot sports. Believe me i looked long and hard for larger sizes but it doesnt really exist without 18's.

As for 235's you can find plenty of those but you will have to choose between 235-40 which is a little too short or 235-45 which is a little to tall. I might try 235-40 next time around it seems what most 235 tire guys run.

Basically, 225/45 and 255/40 is going to be the best setup realistically for most.

 

I have a 235/45 Re01R up front and it feels a little vague but otherwise the car is balanced and grips well

 

those were the exact tires i want...

i daily drive my car and want something that can somewhat perform on the track also. not looking to win championships here either.

i have a set of RPF1s on my vehicle right now and at a 225/255 combo. lowered about an inch on H&R Coilovers (350F/R spring rate)