Go Back  CorvetteForum - Chevrolet Corvette Forum Discussion > General Corvette Topics > Autocrossing & Roadracing
Reload this Page >

Please help with the offsets for c6z 18x111 and 18x13 thanks

Notices
Autocrossing & Roadracing Suspension Setup for Track Corvettes, Camber/Caster Adjustments, R-Compound Tires, Race Slicks, Tips on Driving Technique, Events, Results
Sponsored by:
Sponsored by:

Please help with the offsets for c6z 18x111 and 18x13 thanks

 
Old 01-19-2019, 05:01 PM
  #1  
froggy47
CF Senior Member
Thread Starter
 
froggy47's Avatar
 
Member Since: Oct 2002
Location: Southern CA
Posts: 10,481
Received 141 Likes on 122 Posts
Default Please help with the offsets for c6z 18x111 and 18x13 thanks

Want to order the custom rims from forgestar but I can't seem to nail down the correct offsets to clear calipers, fenders, control arms. This should be well documented as the car has been out since 2006, so what are they??? Thanks the cf5 or cf 10 or s 18 styles.
style.


Last edited by froggy47; 01-19-2019 at 05:01 PM.
froggy47 is offline  
Old 01-19-2019, 10:12 PM
  #2  
bill.c6z06
Junior Member
 
Member Since: Jul 2013
Location: Milpitas California
Posts: 26
Received 2 Likes on 2 Posts
Default

Lots of info here...
https://www.corvetteforum.com/forums...on-c6-z06.html

My F14s came with 7.5" BS front and 9.0" BS rear. The front tires will likely lightly rub the stock air ducts (non-destructively) at full lock with the 18x11s. Some have reported the 18x13 rears contacting the upper control arms at full droop.

Here's a discussion about limiting droop...
https://www.corvetteforum.com/forums...on-travel.html
bill.c6z06 is offline  
The following users liked this post:
froggy47 (01-23-2019)
Old 01-19-2019, 11:14 PM
  #3  
Glowing Rotors
St Jude Fundraiser 6 Yrs
Support Corvetteforum!
 
Glowing Rotors's Avatar
 
Member Since: Aug 2016
Location: Central IL
Posts: 340
Received 11 Likes on 8 Posts
Default Backspacing for 18x11 and 18x13

I run CCW C14's of the same size on my C6Z track car. Backspacing is very close to Bill's at 7.5 inches BS for the front 18x11, and 9.25 inches BS for the rear 18x13

The front tires do lightly rub the brake ducts at full turn. I put a couple of layers of duct tape across the rub point on the brake duct and replace the tape as it wears out. The key is to not turn to full lock unless you have to.

I run coil overs and one inch drop spindles, so droop is not an issue with the upper control arm. Actually I rub on the bottom control arm when I bottom out. I have trimmed the bottom control arm to help clearance, but also have put in a bump stop and added rear wheel spacers.... Also I make sure the wheel weights are not placed toward the outside of the rear wheel because they will get knocked off by the lower control arm.....


Glowing Rotors is online now  
The following users liked this post:
froggy47 (01-23-2019)
Old 01-20-2019, 04:12 PM
  #4  
fatsport
CF Senior Member
Support Corvetteforum!
 
fatsport's Avatar
 
Member Since: Aug 2017
Location: Fl
Posts: 873
Received 147 Likes on 116 Posts
Default

Forgestar only makes F14 in those sizes.
I just bought a set of 18x11, 18x12 that fit great on my C7Z. The offsets were not listed on the boxes, but I also measured 7.5 in backspacing. This comes out to +38 on the front.
fatsport is online now  
The following users liked this post:
froggy47 (01-23-2019)
Old 01-22-2019, 07:41 PM
  #5  
clubracer23
CF Senior Member
Support Corvetteforum!
 
Member Since: Jul 2012
Location: Phoenix Arizona
Posts: 188
Received 10 Likes on 10 Posts
Default

My CCW C10's have the same offsets as Glowing Rotors.
18x11 fronts with 7.50 backspace and 18x13 rears with 9.25" backspace.
clubracer23 is offline  
The following users liked this post:
froggy47 (01-23-2019)
Old 01-22-2019, 08:23 PM
  #6  
_BlueZ06_
CF Senior Member
 
_BlueZ06_'s Avatar
 
Member Since: Aug 2015
Location: Fort Worth TX
Posts: 143
Received 16 Likes on 16 Posts
Default

My forgestars were +37 in the front and +57 in the rear if I remember correctly. This was the clear AP Racing brakes though. This is what was recommended for my application, but you should reach out the one of the vendors and they should be able to help.
_BlueZ06_ is offline  
The following users liked this post:
froggy47 (01-23-2019)
Old 02-05-2019, 07:02 PM
  #7  
froggy47
CF Senior Member
Thread Starter
 
froggy47's Avatar
 
Member Since: Oct 2002
Location: Southern CA
Posts: 10,481
Received 141 Likes on 122 Posts
Default

Thanks all, vendors are all over the place within some mm's so still guessing, see new post.
froggy47 is offline  

Thread Tools
Search this Thread
Quick Reply: Please help with the offsets for c6z 18x111 and 18x13 thanks


Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: