MrZUMZUM

Does anyone know for sure if I mount 265's on the rear if they will rub shocks or trailing arm or anything for that matter...............on stock rims .......

Stock shocks with Eibach springs..........btw.........

Thanks,

David

ptrhahn

iTrader: (9)

265's shouldn't be mounted on the 8" wide stock rim... regardless of what it might rub anywhere... largest you should go is 245/45/16

SleepR1

The calculations point to the 265/45-16s fitting in back. Max back space for rear wheel position is 7.5 inches with stock springs and trailing arms. Back space with 265/45-16s on 8 x 16s (stock 50-mm offset) arithmetically works out to ~7.2 inches back space. Theoretically you should be fine, but practically speaking, you'll just have to try them and see. I'd prefer 9 x 16 for 265/45-16 tires. Actually, I'd prefer 9 x 16s for 245/45-16s. I think 245s are too wide for 8 x 16s!

redrotorR1

265's will mount on an 8" rim, but they will look funky. Ever see cantilever tires? ... kinda like that. And while the 265/45 may mathematically be possible, it still rubs the trailing arm.

Plus, if your signature is all the power adders you have, MrZUMZUM, then 245/45 16's are enough rubber for the power you're making.

ptrhahn

iTrader: (9)

The only 265/45/16 i know of is a khumo R-compound... looks like you COULD fit it on an 8" wheel, but they are measuring it on a 9", and the section width is 10.4".... i don't think it would work worth a crap like that, you'd be better w/ a 245/45.

MrZUMZUM

RedRotor...........my situation is that I came across 8 tires, and the guy selling them off his Porsche rims gave me a great deal on them all for $200........

2 each of the following:

225/50, 245/45 and 265/45 Kuhmo's
225/45 Hoosier R3S03's

All have plenty of tread left, and all are still soft.

So what I'm trying to do is put together some "sets", and what I was trying to determine is if I could use the 265's on the rear and 245's on the front for one set.

I just got back from having them mounted and all is well. Even though I don't need the 265's, that's what he had. It also doesn't rub the trailing arm, actually I've got a good 1/2" of space.

I agree, I'd rather have 245's all the way around, but that's the deal I got. I'll probably buy some 225's to match both the other two Kuhmo's and the other two Hoosiers, so I'll eventually get three sets out of these. I think the worst that can happen is that my car may push a little in the turns.

Ptrhahn, I'm thinking that since the Kumho specs say it can be mounted on an 8-10" rim, I guess it'll be OK/safe. I've got to think they know many people will be using these tires at the track, so if they say they'll go on an 8" rim they better be SURE, right?

Thanks.

David

SleepR1

David,

So the math does work out for 265/45-16s in back? 0.5 inch from the rear trailing arm? So my numbers were conservative, as my calculations say 0.3 inches clearance You'll probably be fine with your setup. Have fun! That's what matters BTW, yes if Kumho says you can mount 265/45-16s on 8 wides (as a minimum rim width), then you should be fine. I think what everyone here is pointing is whether you'll maximize the potential of 265s when only mounting on 8 wides. I think you get that, and that you're kind of stuck with what's available.

Cheers!

ptrhahn

iTrader: (9)

I'm quite sure they're SAFE on an 8" rim, i'd just question wether you wouldn't get better performance w/ a 245 on the same rim... most manufacturers will tell you to put a tire on the widest rim you can get within its range.... a good hint as to what they think will work well is the "measuring rim width" they give... in this case 9".... which is pretty far away from 8". You could do it if you wanted to though....

MrZUMZUM

yea Sleep..........

The 1/2 " was just a guess, I didn't actually measure it...........when we sat the car down off the lift I just reached around and felt the clearance and felt OK about it................

Agreed with everyone on all other points.........just couldn't pass up the sweet deal on all 8 tires @ $25 each when the Kumho's go for $140 or so and the Hoosiers for $ 190 or so............

Thanks.

David

redrotorR1

I've actually tried this. Yes, the Kumho 265/45 16 mounts .... as I've been saying ... and it is fine, if you don't mind the funny look (and the snide comments from all your racing buddies). It looks fine clearance wise, but I got some rubbing during the auto-x's that I ran with them. Luckily, the tires were near dead anyhow (and free!); so it only lasted a couple events. Under deflection, the tire was rubbing ... audibly during my runs. But, not so much that I worried terribly about it. FWIW, $25 each is a damn good deal if there's significant tread on them ... so go for it.

MrZUMZUM

RedRotor:

I still don't understand the "funny look" comment.........I've got both sets on now, the 245's and the 265's, and they pretty much look the same to me, except one being wider, duh.............

What is it you're talking about. Still haven't picked out the cantilever effect, etc.............

Maybe I don't have the discerning eye you do...........

Please explain, because anything that would be so obvious visually seems like it would also be unsafe at 130mph, or 110 through sweepers............

Thanks,

David

SleepR1

David,

I think redrotor1 is just concerned that the 265s are not being used to their full potential on 8 wides. Have fun with the new treads Cantilevered slicks are actually designed to be mounted on narrow wheels. It's a way for SCCA racers to get around the maximum rim width rule by running slicks that are in an inch or 2 wider than the spec rim's overall width Enjoy!

redrotorR1

You don't see the inverted sidewall at all? Stand both tires up and look at them from an angle .... notice how the 265 sidewall angle looks different? Slanted in instead of rounded. That's what I'm taking about.

Don't worry about them being safe. It's fine for racing. Have fun with 'em.

MrZUMZUM

I'll have to look closer...........sounds like they'll be safe enough...............

Thanks everyone.........

David

bkapold@aol.com

265 on a 8"? It will fit on the car, but thats to wide of tire for an 8" wheel..... 245...maybe, 255. It all depends on driving style and whats it used for....

MrZUMZUM

Drove my *** off on the 265's this past weekend at the track and they did just fine............all on 8" rims..........

Oh well.................

David

80-CU.IN.T

I concur 9" - 245 9 ½" - 265
I know people will argue but your side walls will flex a lot with anything narrower. You will feel the difference on the track. On the street it would be hard to tell because of surface irregularities unless you are very familiar with that section of road.

MrZUMZUM

It was hard to tell on the track since I never had run on Kumho's before anyway, so the feel was different to start with. Once I got my confidence in them, they felt just like the Hoosiers I ran last time. Matter of fact, I ran one 2:47, and that was one second better than my best time on the Hoosiers...............probably just more seat time, but I was glad to know I could run pretty much just as fast on them..............as the Hoosiers........

I also ran that time with the tires a little overinflated, and once I got that dialed in my car started overheating so I don't know if I could have gotten faster; I would assume so with better inflation...........

Anyway, the 265's ran just fine, as far as I can tell, all on 8" rims...........

David

bkapold@aol.com

I'm sure the 265's felt great, I mean, hell, you do have an RX-7 right ? they just handle, period!

I "had" a 255 on 17 x 9.5 wheel...want handling on the road course? try that... I have since moved on to 275 though.