C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

68 tire size max.........

Thread Tools
 
Search this Thread
 
Old May 19, 2012 | 11:01 AM
  #1  
Kerrmudgeon's Avatar
Kerrmudgeon
Thread Starter
Race Director
10 Year Member
 
Joined: Mar 2009
Posts: 19,777
Likes: 4,592
From: Canada's capital
2020 Corvette of the Year Finalist (appearance mods)
C1 of Year Finalist (appearance mods) 2019
Default 68 tire size max.........

Hi guy, just a quick couple of questions on my buddy's BB 68. 8 inch rally wheels, stock trailing arms. What's the widest 65R seiries tire you can run? I know 235's will work, but is that the widest? Thanks.

Second, where's the best place to get the longer spring hang bolts? The car has aluminum spacers on the diff and cross member, and sits a little high. Thanks.

This is for the 468-500+ mill we build last summer if you recall.


Last edited by Kerrmudgeon; May 19, 2012 at 11:04 AM.
Reply
Old May 19, 2012 | 12:10 PM
  #2  
TheSkunkWorks's Avatar
TheSkunkWorks
Le Mans Master
10 Year Member
Liked
Loved
Top Answer: 1
 
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
Default

65R???

I've seen people force as wide as 295/50's onto 8x15's, but the widest secton width I'd suggest putting on an 8" rim of most any diameter is 255mm. IMHO it's hard to beat either 245 or 255 /60's on 8x15's, tho the latter have been known to rub up front on occasion.

Last edited by TheSkunkWorks; May 19, 2012 at 12:14 PM.
Reply
Old May 19, 2012 | 12:15 PM
  #3  
Mike Ward's Avatar
Mike Ward
Race Director
10 Year Member
 
Joined: Jul 2001
Posts: 15,892
Likes: 42
Default

Originally Posted by Kerrmudgeon
The car has aluminum spacers on the diff and cross member, and sits a little high. Thanks.
Huh? Never heard of that. Got a pic? You can use stock bolts off a C4, they're slightly longer than C3.
Reply
Old May 19, 2012 | 12:25 PM
  #4  
Kerrmudgeon's Avatar
Kerrmudgeon
Thread Starter
Race Director
10 Year Member
 
Joined: Mar 2009
Posts: 19,777
Likes: 4,592
From: Canada's capital
2020 Corvette of the Year Finalist (appearance mods)
C1 of Year Finalist (appearance mods) 2019
Default

Originally Posted by Mike Ward
Huh? Never heard of that. Got a pic? You can use stock bolts off a C4, they're slightly longer than C3.
Not handy Mike, but racers use them to take any slop (and comfort) out of the suspension. They look like aluminum hockey pucks.
Originally Posted by TheSkunkWorks
65R???

I've seen people force as wide as 295/50's onto 8x15's, but the widest secton width I'd suggest putting on an 8" rim of most any diameter is 255mm. IMHO it's hard to beat either 245 or 255 /60's on 8x15's, tho the latter have been known to rub up front on occasion.
He's got 215-65R 15's on the front, he just needs the rears. I told him I know 235's are normal for the 8in wheels, just wondering how big you can go. I thought 245's, or maybe 255's???? would be ok as well. thanks guys.
Reply
Old May 19, 2012 | 12:45 PM
  #5  
Mike Ward's Avatar
Mike Ward
Race Director
10 Year Member
 
Joined: Jul 2001
Posts: 15,892
Likes: 42
Default

Originally Posted by Kerrmudgeon
Not handy Mike, but racers use them to take any slop (and comfort) out of the suspension. They look like aluminum hockey pucks.

I know of those- but they don't affect ride height at all. Did your buddy change springs?
Reply
Old May 19, 2012 | 12:50 PM
  #6  
TheSkunkWorks's Avatar
TheSkunkWorks
Le Mans Master
10 Year Member
Liked
Loved
Top Answer: 1
 
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
Default

A solid diff locating kit (aka "pucks") should be beneath rather than above the diff cross-member with one replacing the pinion bracket rubber, doesn't really do all that much harm to comfort other than transmitting more noise and vibes into the chassis, and doesn't affect ride height at all. The only ones that go between the x-member and frame are those used for replacing the rubber bushings outright and facilitate raising the diff in the chassis to improve rear suspension geometry on lowered (rather than lifted) C2/C3's, and AFAIK shouldn't be visible.
Reply
Old May 19, 2012 | 01:22 PM
  #7  
Kerrmudgeon's Avatar
Kerrmudgeon
Thread Starter
Race Director
10 Year Member
 
Joined: Mar 2009
Posts: 19,777
Likes: 4,592
From: Canada's capital
2020 Corvette of the Year Finalist (appearance mods)
C1 of Year Finalist (appearance mods) 2019
Default

Originally Posted by Mike Ward
I know of those- but they don't affect ride height at all. Did your buddy change springs?
Originally Posted by TheSkunkWorks
A solid diff locating kit (aka "pucks") should be beneath rather than above the diff cross-member with one replacing the pinion bracket rubber, doesn't really do all that much harm to comfort other than transmitting more noise and vibes into the chassis, and doesn't affect ride height at all. The only ones that go between the x-member and frame are those used for replacing the rubber bushings outright and facilitate raising the diff in the chassis to improve rear suspension geometry on lowered (rather than lifted) C2/C3's, and AFAIK shouldn't be visible.
I had nothing to do with the installation, haven't even looked at how they did it, but it looks wrong. Fender is about 5 inches above the tire. I know they will settle, but no that much!
Reply
Old May 19, 2012 | 01:52 PM
  #8  
Mike Ward's Avatar
Mike Ward
Race Director
10 Year Member
 
Joined: Jul 2001
Posts: 15,892
Likes: 42
Default

Something is way wrong if the rear end is that high. Longer bolts is not the solution.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
story-1

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-2

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-3

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-4

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-5

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-6

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
story-7

2027 Corvette vs The World: Every C8 vs Its Closest Competitor

 Joe Kucinski
story-8

10 Most Common Corvette Problems of the Last 20 Years!

 Joe Kucinski
story-9

5 MOST and 5 LEAST Popular Corvette Model Years in History!

 Joe Kucinski
Old May 19, 2012 | 05:54 PM
  #9  
Jeff_Keryk's Avatar
Jeff_Keryk
Drifting
20 Year Member
Liked
 
Joined: Feb 2005
Posts: 1,879
Likes: 38
From: Los Gatos CA
Default

I have 255R/55/16 Comp TA's on 16x8 Chrome Ralleys. No problemo... She sits a little lower with this size tires.
Reply
Old May 19, 2012 | 07:56 PM
  #10  
TheSkunkWorks's Avatar
TheSkunkWorks
Le Mans Master
10 Year Member
Liked
Loved
Top Answer: 1
 
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
Default

Originally Posted by Mike Ward
Something is way wrong if the rear end is that high. Longer bolts is not the solution.


It would seem so. If still that high with the suspension settled, first suspect I'd check out would be an overly arched spring, but then maybe they've gone and done something odd with the rear suspension. Pics would be very helpful, if at all possible.
Reply

Get notified of new replies

To 68 tire size max.........





All times are GMT -4. The time now is 03:10 PM.

story-0
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-1
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-2
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-3
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-4
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-5
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-6
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-7
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE
story-8
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE
story-9
5 MOST and 5 LEAST Popular Corvette Model Years in History!

Slideshow: 5 most and least popular Corvette model years.

By Joe Kucinski | 2026-04-08 13:25:01


VIEW MORE