wheel offset question
Thread Starter
Advanced
Joined: Feb 2010
Posts: 71
Likes: 0
wheel offset question
ordered my ruff 281s and the wheel shop called me and asked me to bring the car in. they had different wheel offset size they didnt know which ones to order. so they bolted a few rims out and found that 38mm offset is what works. i have a z51 o6 vert are they ordering the right offset?
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
the offset would change with width, check with this
http://www.1010tires.com/wheeloffsetcalculator.asp
http://www.1010tires.com/wheeloffsetcalculator.asp
Thread Starter
Advanced
Joined: Feb 2010
Posts: 71
Likes: 0
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
and when a tire is on it, it will hit the fenders and crack them, and if it doesn't, it will throw enough road debris sand and stones that your fenders and even doors will have chips, spinmonster told you the correct offsets 56 front 79 rear, i posted the offset calculator, your wheel shop is not capable to do the job, they just want to make the sale
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every Model vs Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
Pro
Joined: May 2007
Posts: 699
Likes: 0
From: Dallas TX
Better listen,,,,, This guys are right,,, the offset for a C6 is Front 59 and Rear 79.. But if you do get the wheels with the 38 offset... Pleae take some pictures and post them up for us. We would all love to see them. Really!!!...
Safety Car
Joined: Sep 2006
Posts: 4,075
Likes: 6
From: Wilmington NC
the offset would change with width, check with this
http://www.1010tires.com/wheeloffsetcalculator.asp
http://www.1010tires.com/wheeloffsetcalculator.asp
Le Mans Master
Joined: Jul 2005
Posts: 5,328
Likes: 405
Wheel offset is not a function of wheel width...wheel offset is just the distance from the center of the rim to the flange of the wheel. It's possible to have one 12" rim and one 4" rim that have the same exact offset.
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
the offset could be the same with a different width rim. what i was trying to say was clearances would change, inner and outer, so use the calculator
Tech Contributor
Joined: Mar 2003
Posts: 12,093
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
If you hold the outside edge of the wheel fixed with relation to the hub, adding width changes the offset to maintain that. The offset has to grow because the hub's dist. to the fender is fixed but the center of the wheel moves in.
I make the distinction because guys think that 79mm is the correct offset for the stock rim and then mistakenly think that a 19x11 with 79mm is the correct offset. It isnt. The added width of the wheel in that case being wider, moves where the center of the wheel in. Hence a 19x11 will call for a 91-92mm offset to still have the same distance from the hub to the fender edge as the stock wheel.
Thread Starter
Advanced
Joined: Feb 2010
Posts: 71
Likes: 0
True, and I acknowledge my verbal error.
If you hold the outside edge of the wheel fixed with relation to the hub, adding width changes the offset to maintain that. The offset has to grow because the hub's dist. to the fender is fixed but the center of the wheel moves in.
I make the distinction because guys think that 79mm is the correct offset for the stock rim and then mistakenly think that a 19x11 with 79mm is the correct offset. It isnt. The added width of the wheel in that case being wider, moves where the center of the wheel in. Hence a 19x11 will call for a 91-92mm offset to still have the same distance from the hub to the fender edge as the stock wheel.
If you hold the outside edge of the wheel fixed with relation to the hub, adding width changes the offset to maintain that. The offset has to grow because the hub's dist. to the fender is fixed but the center of the wheel moves in.
I make the distinction because guys think that 79mm is the correct offset for the stock rim and then mistakenly think that a 19x11 with 79mm is the correct offset. It isnt. The added width of the wheel in that case being wider, moves where the center of the wheel in. Hence a 19x11 will call for a 91-92mm offset to still have the same distance from the hub to the fender edge as the stock wheel.
Drifting
Joined: Nov 2005
Posts: 1,745
Likes: 35
From: Turlock CA
First time you've mentioned that. 
With a 38mm offset the fronts will be ok and the rim will sit out 3/4" more than OEM. On the rear you need 60mm or higher to fit under the fenders tot eh outside. There's plenty of room to the inside.
With a 38mm offset the fronts will be ok and the rim will sit out 3/4" more than OEM. On the rear you need 60mm or higher to fit under the fenders tot eh outside. There's plenty of room to the inside.
