Hi guys, I am running 255 40 17 all around on 9J +45 offset rims. On big dips, the rear rubs but the fronts are worse with strips of rubber about 2mm thick being peeled off the shoulder edge of the tyre. I have rolled my front and rear fenders to the max. I run 3.0 F & R camber

I was wondering if I go 245 40 17, would this solve my rubbing issue? If the clearance is critically enough to clear the fenders, I would probably go this route.

However, if 245 40 17 wont solve the rubbing, then i'd spend the money doing some flaring of fenders & stay 255.

My car will be used extensively for tracking, so just weighing my options. I am on Tein SRC but it still rubs when I hop over curbs...

hoping the non staggered guys can chip in for help on this issue.

 

One of the guys in town is running RPF-1's with 255 non staggered and is running club racer front springs and he has no rubbing issues that I'm aware of.

edit: Great blog link btw, I've been looking for brake solutions for fade.

 

I would imagine a 245/40-17 would give you the clearance you are looking for...but it is going to be dependent on a few things.

Actual tire sizes vary from manufacturer to manufacturer (sometimes even line to line within the same manufacturer).

A 245/40-17 should be 10mm narrower and about 5/16" shorter (5/32" short from hub to fender). But if you are going to a different tire, say to a Kumho XS or Hankook RS3, you might not be getting a narrower tire.

 

I'm on Advan Neova AD08 so i'm not sure how much broader my tyre is compared to ur club racer friend. I'm just really worried about the rubbing and my tyre edge being shaved down by my front fender, it makes a bit sick to see it happening.

Thanks for ur feedback on the blog. Do let me know if there any ideas on how I can improve it. I have begun measuring rotor temps with a pyrometer so I look to be giving more absolute data to supporting my hypothesis.

 

as my tyre will be also AD08 like what i'm running on now, would it be safe to say that the outside edge of the tyre will be deeper in by at least 5mm? (since is total 10mm per tyre)

That 5mm might be the critical clearance required.

I just wonder how difficult is it for body shops to do some fender flaring to help me make that critical few mm flaring to ensure proper clearance.

 

if you're a track guy, you want 255 over 245. more tire is better for grip. it's also easier to buy 255 tires. i don't know many track guys who run 245 non staggered. they all run 255 non staggered.

I would try raising the car a little first. That's the easiest way to fix things. especially given how much camber you already run.

Your caster setting could also be causing the major front rubbing.

Fender flaring is not easy. The only real way to do it well is to flare it, bondo, and repaint.

 

dont think i can go much higher on my SRC's. My caster is about stock so it shouldnt be the issue. In any case, I get rubbing for both front & rear so that rules out the issue at least for the rears. I really dont want to go 245's if possible.

Fender flaring isnt done commonly here so thats why i'm having a problem looking for a good shop to do it at. If i had access, I would have done it long ago.

 

so youre rolled all around and a bit flared? i think you should easily be able to clear the fenders if rolled properly with -3 camber front and rear.

 

I am rolled but not flared which is why i'm getting the rubbing. How secure do u think I'd be if I got a slight flare done?

 

The 245/40R17 is normally going to give you about 1/3" more clearance. That along with the fender lip roll and some negative camber and you should be fine.