Biggest rear tire on 15x8 4.5BS for 68 F-body

[rohrt]

I went through 60 some pages on this forum and couldn't find this question anywhere. At least not from looking at the subject line.

Anyway I plan on using Hotchkis lowering spings with factory disc/drums on my bird and want to know what the biggest and safest (as in clearence) tire I can run. My thinking is 235\60\15 in front and 245\60\15 in the back.

I saw one guy with a 69 camaro was running 2inch lowering springs with 235/60/15 and 255/60/15 but this was on a 69.

Am I being to agressive or will an even bigger tire fit in back?

[6'9"Witha69]

I have fit a 275/60 on the same type rim. Close but no rubbing with clearanced lips.

[rohrt]

But the 69s have a inch more room don't they? I'm guessing I wont get much response on this one since most people are running 17s or 18s on on this site.

[35spline]

Way back before 18" wheels bacame the norm it was the 275/60/15. This is about a 28" tall tire so it tucks well under the rear fender.

[ProdigyCustoms]

67 / 68 have more room. 275 is fine

[HotRod68Camaro]

yea 275/60-15 here also. i think it looks great.

[eville]

275 on an 8"... Wow... I thought 255 was max...

[ProdigyCustoms]

Remeber Steve were talking 15s here with lots of sidewall.

[SicMonte]

what about in a 16x8? i have 255/50/16's...thats the biggest i could find.

[rohrt]

Well I finaly measured my ralley rims and found out they are 4.5 backspacing on a 8 inch. I was hoping they were 5 inch backspaceing. I think I'm just going to go with a 235 in front and a 245 in back and keep it safe.

[6'9"Witha69]

4.5 will be fine as long as you have good bushings in the rear. I ran a 275 on a 15x8 with 4.5 and on a steep angle up a driveway actually wedged the inner sidewall into the wheel housing. I changed the bushings from soft rubber to hard Poly and it went away.

[rohrt]

Then I should be in good shape then. Except I have a 68 not a 69. I'm still going to go with a 245 in the back. I think I will burn them up fast enough that if I don't like them I will go bigger on the next set.

Thanks

[6'9"Witha69]

That's the spirit!

[jknight16]

At the risk of incriminating myself...I'll admit to having run a 305/50/15 on an 8.5'' wheel for over 3 years on my 69, strictly on the street and dragstrip without problems. Though I should add, that doesn't mean that I wasn't asking for trouble...I was 16, didn't know any better!

[High Plains Mopars]

Not a chevy, but here is a 295 on an 8" rim.

[Ricter]

Anyone have pictures of a 275/60 on a 15x8 wheel? I've got a 69 Firebird, and I might end up having to stick with a set of rallyes for the time being.

[4086D9]

Im running 275/50/15's(when I hit the strip) with a 15x8 Weld's. Bs is 4.5". My car is lowered 3" in back with DSE springs. I did trim the lips a bit. Looks perfect!

[buickfunnycar.com]

275 on an 8"... Wow... I thought 255 was max...

I got some friends here that are Trans-Am crazy,several run 295/50-15's on a 7" wide wheel!They want that T/A buldge...and I think they've acheived that



275/50's on a 7" wide wheel:


275/295 set-up:




The "buldge":


I have a set of 15x7 AR 200S with 275/50 & 295/50 rubber I'll be slapping on the '69 soon...can't fight this crowd.

[PhillipM]

Then I should be in good shape then. Except I have a 68 not a 69. I'm still going to go with a 245 in the back. I think I will burn them up fast enough that if I don't like them I will go bigger on the next set.

Thanks

I know this post is old but at least put a 255 back there!! Please!

[vanzuuk1]

Bad ass cars john.......I agree the fifteens look great on those cars, I grudgingly run sixteens to get a good tire.