Hi, im considering getting rims in the sizes 18x9.5 in the front and 18x10.5 in the rear, my question is whats the lowest offset i can go, i will NOT be stretching the tire mad tyte jdm style because it will be a DD/light track duty setup. the wheels im looking at come in +15 offset (enkei rpf1's) and id love to run that but im scared it wont fit and noone local has 18's that wide that i can test fit.

THanks in advance!

-Robert

 

BUMP! i know you cali guys are all up now, lol.

 

The +15 will not be close to fitting; they will be way too aggressive (low offset).

With those sizes, no stretch and mild camber, you need something in the ballpark of 18x9.5 +32 to 35 and 18x10.5 +43 to 48.

 

thats what i thought,

they also offer:

18x9 +35
18x10 +35

i think thats what im gonna go with, i can always run some negative camber (<2 deg.)

 

i guess my next question is does anyone know if

18x9 +35
18x10 +35

will fit on a 2nd gen sedan?

 

They fit no problem.

 

BTW, RPF1s are great light weight wheel choice.

 

Yes. I run 10" rears with +35 offsets and 275 tires. You will need to run around -1.6 to -1.8 degrees of camber to get them to clear the fender, but they will be flush with non-stretched tires. The fronts will be a tad tucked, and you may want to add a small spacer (5mm, with 10mm you may rub slightly on the fender liner).

I think with a 1" difference in width on the front and rear wheels, you really want a 10+mm lower offset on the front (if that makes sense). In your case it just means the rears are going to be more aggressive than your fronts.

Why not run the 18x9.5 +38 all around with something like 255 tires? I did this on my G35, and the big advantage is you can rotate tires and get a lot more life out of them. On something like the RPF1 that does not have a lip, you will not really notice by looking at them. They will also give you more balanced handling if you plan to track your car.

The also make the new PF01 in 18x9.5 +35, and the GTC01 in a 18x9.5 +38. I personally like these a tad more than the RPF01.

 

thanks for everyones suggestions. seems like the 10.5 in the back is out of the question, but im happy with 18x10 in the rear.

jran, what are your exact tire size? 275/??/?? i will be rolling the fenders but i dont want the wheels PERFECTLY flush as i commonly sit 4 in my car. i also dont drive my car like a baby which means in these miami roads i take bumps and with the drop now and stock 18's ive never rubbed or bottomed out, i dont want to hear that tire against fender sound everytime i go over something rough.

 

There is not much fender rolling you can do on a sedan. The rears are basically cut from the factory and there is nothing to roll, and the fronts are not really rollable (if that's a word).

I run 20x9 +25 with 245/35/20 tires on the front. This rubs very little on my fender liner at around -1.6 degrees of camber. It seems to clear with around -2 degrees. It does not rub on the fender itself. There is not really anything I can trim or roll on the front to stop the rubbing with the lower camber setting. The wheel itself is pretty much flush with the front fender.

I run 20x10 +35 with 275/30/20 tires on the rear. This clears my fender at around -1.7 degrees of camber. I have lowered the rear with my new coilovers, and I rub a little on the fender liner inside the fender now. I am going to trim it back this weekend. It is not really needed (I think it is more for sound deadening purposes). This size wheel actually sticks out about 5mm from the rear fender. The negative camber and mild stretch of the 275 tire on a 10" wheel allow it to clear the fender.

What are you lowered on? H&R springs? Any camber arms? If not, you are pretty low, and probably have quite a bit of negative camber to help tuck the wheels in. I would guess at least -2 degrees in the front, and maybe a little more in the rear? You should be fine going almost as aggressive as I have without rubbing. I am not rubbing on the fender any where; just the liners. You are probably running more negative camber than me at this point (I am pretty low, but I have adjustable camber arms F/R--I try to keep my negative camber under -2).

EDIT: I just saw you are running SPC parts.... Do you know your alignment specs?

 

I think your best bet on the RPF01 is the 18x9 +35 front and 18x10 +38 rear (the rear will still have a small amount of poke at normal alignment settings). If you want to go less aggressive, you could go with 18x8.5 +30, and 18x9.5 +38/45. You may decide you want a 5-10mm spacer on the front with either setup, but see what you think first.... As mentioned, you could also do the 18x9.5 +38 all around.

 

Im actually running bc coilovers with front and rear camber from spc. My alignment in the front is -.3 and in the rear -1.4. The car is pretty low right now, lower than h&r springs for our cars put us.

In the front there is maybe half an inch of fender that i can see stickibg out but idk if its rollable/cuttable. I wont mind running -2 in the rear for camber and ill probably go with a 275 tire on the 10 inch wheel in the rear. It sucks we cant run setups like the coupes of 370z's.

And yes, rpf1 ftw to all those who like them!!

 

Cool, go with the 18x9 +35, and 18x10 +38. If you leave the front camber where it is, you should be fine, and as you mentioned, you may need to go up to around -2 degrees on the rear (probably a little less). You should be set with those sizes though.... It should be a nice setup.

 

He will have no problem with rubbing since he'll be running 18s. 275 tires are just a pinch stretch over the 10" barrels and when you consider that the width of the sidewall, it'll be a perfect clearance with just the right amount of drop.

EDIT: Stretching or not... is up to what type of tire he'll be running. Some tires run true size, and others run slightly bulged size because of the sidewall design such as Pirelli PZero.

 

Blueslate, you have a good point. In my head i know the exact way i want the tires to look on the rim but putting that in real life will be a toughy, ive been through my fair share of tires and know even same size diff brand tires look diff. The nitti invos i have on ny stock 18 right now have the sidewall i like, not stretched but not bulged, and a little rounded where the tire turns.

I was gonna say, which i totally forgot, since they will be 18's, wont i not have nearky as many isses as those running 20's?

Sorry for the horible spelling, im on ny phone.