Club Cobra Gas-N Exhaust  

Go Back   Club Cobra > Manufacturers, Engine Builders, tools, and parts. > ERA---Speak with Bob Putnam

Welcome to Club Cobra!  The World's largest non biased Shelby Cobra related site!

  •  » Representation from nearly all Cobra/Daytona/GT40 manufacturers
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and nearly 1 million posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

MMG Superformance
Nevada Classics
Main Menu
Module Jump:
Nevada Classics
Nevada Classics
MMG Superformance
MMG Superformance
Advertise at CC
Banner Ad Rates
MMG Superformance
MMG Superformance
Keith Craft Racing
November 2020
S M T W T F S
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30          
  #1 (permalink)  
Old 10-03-2010, 06:43 PM
SSSammy's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jul 2006
Location: McKinney, TX
Cobra Make, Engine: 2005 Ford GT
Posts: 1,252
Not Ranked     
Default 17" 6 pin wheel specs?

Thinking about getting a set of 17 inchers so I can have more choices for tracks that have a street class (like Run N Gun). I see PSE and Vintage offer the 17" Halibrand replicas in custom backspacing and offsets. How do I spec these wheels for my ERA 427 SC with 6 pin option? I read the info on the ERA 427man site about what the backspacing should be for each tire size and rim width. Surely the offsets are different for a 17" wheel 9" front rim and a 11" rear rim than they are for a 15" wheel width 7.5" and 9.5"???

thanks!
Sam
Reply With Quote
Sponsored Links
Sponsored Links
  #2 (permalink)  
Old 10-04-2010, 04:33 AM
undy's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Jul 2005
Location: Virginia Beach, Va & Port Charlotte, Fl.,
Posts: 2,180
Not Ranked     
Default

Don't know about ERA, but the SPFs run 4 1/2" back spacing in the front and 4 3/4" back spacing in the rear using Vintage's 17" 5 pin offerings. My LSC uses 5 1/4" front and 5 1/2" rear backspacing with Vintage's 5 pin, 17" knock offs. They're all using back spacing as their point of reference, not offset. I'm pretty sure if you talk to Bob @ Vintage he'll know off the top what backspacing's needed for the ERAs.
__________________
Too many toys?? never!
Reply With Quote
  #3 (permalink)  
Old 10-04-2010, 05:02 AM
CC Member
Visit my Photo Gallery

 
Join Date: Nov 2003
Location: New Britain, CT
Cobra Make, Engine: Size 10 Feet
Posts: 2,780
Not Ranked     
Default

For some reason, I didn't have all the front specs. Fixed.

Wheel Offsets
Reply With Quote
  #4 (permalink)  
Old 10-04-2010, 08:43 AM
Clois Harlan's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Dec 2000
Location: Broken Arrow. OK ( South Tulsa), USA, OK
Cobra Make, Engine: 66 COBRA FE 427 /4SP. (HCS Coupe w/ 408 Stroker and TKO 600 -sold)
Posts: 5,596
Send a message via AIM to Clois Harlan
Not Ranked     
Default

Sammy give Bob a call he has done all the math for the different makes of Cobra's. I think he will give you a Run N Gun discount.

Clois
__________________
Sunshine, Asphalt and no stop signs...Perfect

"Let's roll"

"Be part of Something Good
......Leave Something Good Behind!"
from CD "Long Road Out of Eden"
Reply With Quote
  #5 (permalink)  
Old 10-04-2010, 08:56 AM
SSSammy's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jul 2006
Location: McKinney, TX
Cobra Make, Engine: 2005 Ford GT
Posts: 1,252
Not Ranked     
Default

Quote:
Originally Posted by strictlypersonl View Post
For some reason, I didn't have all the front specs. Fixed.

Wheel Offsets
Bob, I am missing something ...

Per the chart you refer to:

Front Wheel 9.0"W x 17" gets 4.75" backspace. What is the offset? .8" like the 7.5"W x 15"?

Rear Wheel 11.0"W x 17" gets 4.3" backspace. What is the offset? 1.7" like the 9.5"W x 15"?

Just want to get it right before I make the call in case the supplier needs me to say what it should be for an ERA.

Thanks very much,
Sam
Reply With Quote
  #6 (permalink)  
Old 10-04-2010, 10:40 AM
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2001
Location: E BRUNSWICK N.J. USA,
Posts: 3,841
Not Ranked     
Default Sam is your body setup for 17" wheels??

Sam ERA had to modify my cobra for 17" wheels. The body as been trimmed and fillers to clear. The other thing is to talk to Bob about the P/S setup. He didn't have the numbers of the rack in my car. I do have the specs. 2.0 ratio. 17" length. The other problem is there are only a couple of 17" tires with low wear numbers over 200. Pilots are 220 and cost through the eye sockets. I will see if I can find a # of the appleton rack for you. Rick L.
Reply With Quote
  #7 (permalink)  
Old 10-04-2010, 11:38 AM
CC Member
Visit my Photo Gallery

 
Join Date: Nov 2003
Location: New Britain, CT
Cobra Make, Engine: Size 10 Feet
Posts: 2,780
Not Ranked     
Default

I pretty much gave up giving wheel makers the actual offsets (which is the most accurate way to define the wheel). Most of them only want the backspacing. You can figure the offset by adding about .8" (an average edge width x 2) to the nominal width, then dividing by 2. The difference between that number and the backspacing is the offset.

Just to make things even more interesting, not all companies define offset in the same direction, so it's best to send them a well-defined drawing.
Reply With Quote
  #8 (permalink)  
Old 10-04-2010, 11:57 AM
SSSammy's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jul 2006
Location: McKinney, TX
Cobra Make, Engine: 2005 Ford GT
Posts: 1,252
Not Ranked     
Default

Quote:
Originally Posted by RICK LAKE View Post
Sam ERA had to modify my cobra for 17" wheels. The body as been trimmed and fillers to clear. The other thing is to talk to Bob about the P/S setup. He didn't have the numbers of the rack in my car. I do have the specs. 2.0 ratio. 17" length. The other problem is there are only a couple of 17" tires with low wear numbers over 200. Pilots are 220 and cost through the eye sockets. I will see if I can find a # of the appleton rack for you. Rick L.
Dunno, Rick .. my chassis is a "Gen II" post ser # 731, which had numerous changes from the earlier version. The 26.5x10 Billboards fit, with an occasional rub. They are about 12.5" section width in back. The 26.5x8.0 are about 11" wide in front. I'm using that as a "do not exceed" template.

I'd appreciate the info on the power steering rack!

Sam
Reply With Quote
  #9 (permalink)  
Old 10-04-2010, 03:17 PM
SSSammy's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jul 2006
Location: McKinney, TX
Cobra Make, Engine: 2005 Ford GT
Posts: 1,252
Not Ranked     
Default

Quote:
Originally Posted by strictlypersonl View Post
I pretty much gave up giving wheel makers the actual offsets (which is the most accurate way to define the wheel). Most of them only want the backspacing. You can figure the offset by adding about .8" (an average edge width x 2) to the nominal width, then dividing by 2. The difference between that number and the backspacing is the offset.

Just to make things even more interesting, not all companies define offset in the same direction, so it's best to send them a well-defined drawing.
Thanks, Bob. I can work with that. Just want to know all that I can know about it.

Sam
Reply With Quote
  #10 (permalink)  
Old 10-04-2010, 03:31 PM
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2001
Location: E BRUNSWICK N.J. USA,
Posts: 3,841
Not Ranked     
Default Wish you would have said something before Sat.

Sam We could have taken my wheels off and try them on your car. Then you would have had an idea about fit. Mine are 335/ 17" The other thing is to increase the spring rates on the car to stop body roll and leen. I will call you in the evening. Rick
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 12:56 PM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: CC Policy
Links monetized by VigLink