Fender Rolling

[Variance]

Originally Posted by prophet0007

im planning on putting on 225/40/18 tires on my 98 318ti. The store that i plan on buying them at said there's a chance i'll have to roll my rear fender. Does anybody know for sure if that's what i'll have to do?

I have 245s in the rear with no problems. You should be fine.

[KetteringTi]

Originally Posted by Variance

I have 245s in the rear with no problems. You should be fine.

But you have 17's, right?

[Variance]

Yes, but I don't see what the difference would be. The outer diameter and width of the tire is still the same, whether it's on 18's or 17's.

[KetteringTi]

I'm under the impression that a 245/40R17 tire has a smaller rolling diameter than a 245/40R18 tire.

EDIT: The rolling diameter of the 18 inch tire with identical width and profile numbers is exactly 1 inch larger, which is definately nothing to scoff at considering the kind of clearances we are talking about.

I would recommend this gentleman to use 245/35R18 tires, as they are only .04in larger in overall diameter

[Variance]

No no no, with a larger wheel diameter, you have to get a smaller profile tire. You need to keep the rolling diameter as close to stock as possible, or else your speedometer and odometer will be wrong.

[KetteringTi]

You were implying that a 40-series 18in tire would be the same height as a 40-series 17in tire, which is false. A 35-series 18in tire would be the best bet.

[Variance]

Okay, I see where we're getting our wires crossed. With my original post, I didn't mean to imply anything abut the profile of the tire. I was just saying that you can fit a 245 width tire fine in the rear. Of course, he would have to adjust his profile to get the proper rolling diameter with the new width. I guess I should have been a little more specific, sorry about that.

[KetteringTi]

Now I get it! LOL You had me doing research online to make sure I wasn't talking crazy. I was typing in different tire sizes into a few of those speedometer error calculators and the whole bit. I should have trusted you to know things like that, but it seems like there's lots of people who don't know a whole lot... And I haven't been active on here for long enough to know who does and doesn't. I'll just file you away into the "people who know things about cars" column.

[Variance]

Haha, no problem, man. I guess we can let this thread get back to fender-rolling now, heh.

[KetteringTi]

On with the fender rolling!

I wish I could sleep....

[Variance]

Ditto. Insomnia ftl.

And back on topic... for real this time.

[jetblackbimmer]

I need my front fenders rolled a bit but I could not do that myself. What would be a good price? It can't be that much, can it?

[AlaskaBlue]

Oh you can do it yourself

Ok here are the pics.. a little delay, but here they are.

Tires are 235/40/17 hankook RS2s they run wide so maybe more comparabe to a 245 tires. Offset is 40mm with a 12mm spacer. Drop is 3.1 front 2.5 rear..maybe a bit more. With -1.5 camber in the rear.

[AlaskaBlue]

Pics of the cf/kevlar race seats for fun....I still need the black covers

[osattack13]

i dont know if im crazy or not but i keep getting people telling me that i cant fit 245x40 R17s on the back of my ti . but here you guys seem to get it done.
i know i will have no problems with my fronts which are 225x45 R17. but im scared that fender rolling wont be enough for my rear