Rim offsets
Melting Slicks
Joined: Apr 2015
Posts: 2,353
Likes: 779
Anywhere in this ballpark:
19x9.5 et. +50 thru +56
20x11 et. +70 thru +79
As you go higher in number, the less aggressive. However even my least aggressive numbers are decent (a bit more aggressive than oem Z51 wheels to bring wheel/tire outboard to fender.
Even the most aggressive with work with 295's in rear ***depending on your ride height, and tire brand.
285's will be a slight stretch in the rear, 295's-305's will be flush with wheel but 305's will depend on tire brand, ride height and work best with the least aggressive listed offsets.
Front must be Forgestars least concave offering, rear will be the "semi concave". Keep in mind you can order Forgestars to the exact 'mm' desired.
19x9.5 et. +50 thru +56
20x11 et. +70 thru +79
As you go higher in number, the less aggressive. However even my least aggressive numbers are decent (a bit more aggressive than oem Z51 wheels to bring wheel/tire outboard to fender.
Even the most aggressive with work with 295's in rear ***depending on your ride height, and tire brand.
285's will be a slight stretch in the rear, 295's-305's will be flush with wheel but 305's will depend on tire brand, ride height and work best with the least aggressive listed offsets.
Front must be Forgestars least concave offering, rear will be the "semi concave". Keep in mind you can order Forgestars to the exact 'mm' desired.
Last edited by \Boost Monkey/; Feb 3, 2016 at 12:29 AM.
Thread Starter
4th Gear
Joined: Dec 2015
Posts: 4
Likes: 0
Anywhere in this ballpark:
19x9.5 et. +50 thru +56
20x11 et. +70 thru +79
As you go higher in number, the less aggressive. However even my least aggressive numbers are decent (a bit more aggressive than oem Z51 wheels to bring wheel/tire outboard to fender.
Even the most aggressive with work with 295's in rear ***depending on your ride height, and tire brand.
285's will be a slight stretch in the rear, 295's-305's will be flush with wheel but 305's will depend on tire brand, ride height and work best with the least aggressive listed offsets.
Front must be Forgestars least concave offering, rear will be the "semi concave". Keep in mind you can order Forgestars to the exact 'mm' desired.
19x9.5 et. +50 thru +56
20x11 et. +70 thru +79
As you go higher in number, the less aggressive. However even my least aggressive numbers are decent (a bit more aggressive than oem Z51 wheels to bring wheel/tire outboard to fender.
Even the most aggressive with work with 295's in rear ***depending on your ride height, and tire brand.
285's will be a slight stretch in the rear, 295's-305's will be flush with wheel but 305's will depend on tire brand, ride height and work best with the least aggressive listed offsets.
Front must be Forgestars least concave offering, rear will be the "semi concave". Keep in mind you can order Forgestars to the exact 'mm' desired.
Melting Slicks
Joined: Apr 2015
Posts: 2,353
Likes: 779
You need to measure based on what I gave you and find out, but a 315 is pushing it for sure.
For the fronts, same +15mm outboard and +15mm inboard from stock.
Last edited by \Boost Monkey/; Feb 3, 2016 at 08:11 AM.
Thread Starter
4th Gear
Joined: Dec 2015
Posts: 4
Likes: 0
For the rear setup, that will put the tire (dependent on tire brand, some have more aggressive sidewall than others) about +15mm (+/-) outboard and inboard from the current oem tires on the Z51.
You need to measure based on what I gave you and find out, but a 315 is pushing it for sure.
For the fronts, same +15mm outboard and +15mm inboard from stock.
You need to measure based on what I gave you and find out, but a 315 is pushing it for sure.
For the fronts, same +15mm outboard and +15mm inboard from stock.
Le Mans Master
Joined: Jun 2004
Posts: 6,269
Likes: 50
From: Dallas Texas
St. Jude Donor '06-'07-'09-'10
Since you're going 1" wider than stock your best bet is to stay with the stock +56mm front and +79mm rear offsets. This adds .5" to both the inside and outside of the wheel from its centerline. Going with less offset moves the wheel that much further out away from the chassis and may cause fender lip interference with wider tires
Advanced
Joined: Apr 2009
Posts: 78
Likes: 4
From: Baytown Tx
Since you're going 1" wider than stock your best bet is to stay with the stock +56mm front and +79mm rear offsets. This adds .5" to both the inside and outside of the wheel from its centerline. Going with less offset moves the wheel that much further out away from the chassis and may cause fender lip interference with wider tires
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Melting Slicks
Joined: Apr 2015
Posts: 2,353
Likes: 779
It's gonna be really close, and come down to what tire you choose (what width and how beefy the sidewall is (varies by brand/tire).