Can a 275/35/18 fit on the front without rubbing with stock unrolled fenders.

Wheels are 18x9.5 + 45

Thanks

 

I wouldn't think so. thats huge to run upfront. To run that you would need a fender pull/roll, or wider front fenders (ie.Burnout Fenders) and some camber adjustments. And even then i think 275 is definitely pushing it. ( i wouldnt bet anything that it would fit, or look good)

 

just trying to find a tire to run up front that will match the sidewall of the rears in a competition tire, but also be wide enough not to push under corner exit. Haveing trouble finding tires that are 35 sidewall and are the same tire front and rear. I would prefer to run a 255 up front but like i said having trouble finding a competition tire to fit the sidewall sizes.

 

What do you mean a competition tire? R-Comps or slicks?

 

Its doable, but not ideal. It isnt the width that the problem, but a 275/35r18 is a tall tire for us, especially up front. You want either a 265/35, or a 285/30. A 275/35r18 is almost a full inch taller than a 285/30r18. I myself (as well as many others) have run a 285/30 up front without much issue, and Ive also ran a 265/35r18 up front on wheels in the exact wheel specs you listed. However, since you make mention of racing, you will almost undoubtedly need to roll the fenders, or youre guaranteed to catch a lip under hard cornering. Rolling isnt that big of a deal, and should almost be considered a must. Ive grabbed the lip of my stock fenders running stock wheels and just lowering springs.

 

Tread width does not play as large a roll in understeer/oversteer out of the corner as alignment. Choose a tire with the correct OD if you're running ABS and a tread width that will fit your wheels and your fenders with your chosen fenders.

 

it eill be a dot r-comp thanks for the responses. I dont mind rolling fenders just not sure whjo around me can do it without cracking the paint.

as far as width i know its the height relative to the width thats why iasked i figured it would be to tall and catch fender on full turn/load.

 

why is everyone so obsessed with matching F/R tire diameters? i dont get it..
my rears are ~1" taller than the fronts.

 

i have the exact same spec wheels and run a 255 up front and a 275 in the rear. Ive tested the suspension under full compression and it doesnt rub, but dam its down to spitting hairs close. I think anything more on that offset and you need a good roll.

im sure you could fit bigger with some negative camber and alignment tweaks and such, but why would you want to run anything bigger that a 255 up front anyways. a 255 is a dam big tire. it can be done but i doubt on a stock fender w/o a roll(unless you get a higher offset).

 

I have 275/35/18s on 18x9.5 +45 RPF1s up front with stock fenders. They fit with a 25.25" ride height without rolling the fenders, and I may be able to go slightly lower, I just haven't tried yet. I'm going to go down another 1/8th inch next time I take the wheels off.

One catch... there are two metal tabs on the inner edge of the fender that the fender liner screws into. I removed those screws, forced the fender liner behind the tabs to hold it in place, and bent the tabs up as far as I could by hand (they bend pretty easily). Zero rubbing after that.

 

It could be an issue on cars with ABS.

I don't know what the threshold is, but the ABS system is sure to notice at some point.

 

I run 275/35/18's Hoosier A6's on 18x9.5 +45 RPF1's all around with a 12k/10k setup. Ride height is setup at 25.75 all around. I have no problems with rubbing at all.

http://jwolfeproductions.zenfolio.co...7356/e31f4232e

 

Mostly reaction time though, but then again the abs was setup for 16" wheels with a 50 sidewall. Only way to find out is to test it.

 

Moehler - any chance you could post a few pics of your car..? I'm looking at a similar setup

 

I have a similar setup - 285/30/18 on 18x9.5 +38 RPF1.

Bending those tabs to hold the fender liner is pretty much necessary with that much tire.

When those tabs break I guess we need to find another solution.

 

I don't know if the algorithm the ABS uses is known or not.

At least in my experience the larger than stock diameter tires don't affect it much.

What I had in mind was the threshold in speed difference between the front and rears under braking when the rears are a larger diameter.

It would be surprising if the ABS system in an FD knew anything other than the delta. The ABS may kick in sooner if it thinks the rears are sliding because they are turning at a lower RPM than the fronts.

But then again, I'm no automotive engineer, and may not know what I'm talking about.

 

I'll try and snap a few pics in the next day or two.

 

Here are a few pics...

 

nice setup....hard to believe they don't rub without a fender roll. My setup won't be as aggressive so I'm cautiously optimistic they won't rub either. I'll keep an eye on the fender tabs. Thanks for posting the pics!! nice car!

 

nice wheels

 

+1, it just counts teeth, and compares em, so its going to think the fronts are locking up sooner than they are, maybe.

doesn't sound like such a big deal, although i am in a comfortable armchair

 

The other day I rubbed my fender after aggressively pulling into a driveway. It pulled a 1" section of the fender lip almost straight down, but didn't cause any damage. I bought the eastwood fender finisher tool and rolled the fender so the inner lip is folded 180 deg. It took 15 minutes and worked great. I highly recommend this tool for front fenders on the FD since they are so thin.

 

why is everyone so obsessed with matching F/R tire diameters? i dont get it..
my rears are ~1" taller than the fronts.

One issue on the FD that the FC doesn't have is the front wheel arch is narrow front to back.

With the 255/40-17 from the front of my FC on the FD the tire just clears the rear of the fender when turning. Granted, I have factory mudflaps on the car- though many others will have this or some sideskirt piece here.



Regarding ABS
+1, it just counts teeth, and compares em, so its going to think the fronts are locking up sooner than they are, maybe.

doesn't sound like such a big deal, although i am in a comfortable armchair

Also an uniformed opinion, but the FD just has 3 channel ABS; not some advanced vehicle stability control.

The ABS is trying to keep the wheels from locking (becoming stationary) and not trying to closely regulate their relative speeds to each other.

If it were to regulate relative wheel speeds that closely it would have to be a full vehicle stability system with steering wheel angle sensors and accelerometers- because simply trying to keep all four wheels moving the same speed would only allow the car to brake in a straight line...like.... a skid...

 

If you re-read my post you will that what I am postulating is what might happen while braking in a straight line - ABS kicking in unnecessarily.

There was no reference made to anything resembling traction control. As I run the same diameter tires front and rear, I don't really have a lot of concern about it, merely academic curiosity.

 

I was't trying to pretend I knew any more about the FD ABS than you jkstill or Mike, I was just putting forth my own uniformed opinion.

Sorry if my tone came off wrong or I took your point out of context.