Need help with rev per mile specs for goodyear eagle f1 supercar tires in 285/40/18 - The Mustang Source - Ford Mustang Forums

Go Back  The Mustang Source - Ford Mustang Forums > Resources > Tire and Wheel Tech
Need help with rev per mile specs for goodyear eagle f1 supercar tires in 285/40/18 >

Need help with rev per mile specs for goodyear eagle f1 supercar tires in 285/40/18

Notices
Tire and Wheel Tech All the tire and wheel technical information you can think of in one place!
Sponsored by:
Sponsored by:

Need help with rev per mile specs for goodyear eagle f1 supercar tires in 285/40/18

Reply

 
 
 
Old 8/17/18, 10:29 PM
  #1  
GTR Member
Thread Starter
 
m05fastbackGT's Avatar
 
Join Date: May 11, 2006
Location: Carnegie, PA
Posts: 6,130
Thanked 216 Times in 206 Posts
Need help with rev per mile specs for goodyear eagle f1 supercar tires in 285/40/18

Looking for the actual rev per mile specs for Goodyear Eagle F1 Supercar tires in 285/40/18. According to Goodyear's website, they list the revs per mile specs at 775 on a measured 10" rim. However, when I checked Tire Size.com, they list the revs per mile specs at 748. At any rate, I just recently swapped my rear axle gears and I'm not really sure as to which is the correct rev per mile specs for my particular application, as my measured rim width is 9.5 inches. In the meantime, any help/feedback provided would be really appreciated.


Thanks.
m05fastbackGT is offline  
Reply With Quote
Old 8/18/18, 05:13 AM
  #2  
FR500 Member
 
David Young's Avatar
 
Join Date: September 16, 2009
Location: Clinton Tennessee
Posts: 3,101
Thanked 38 Times in 35 Posts
I would believe Goodyear for the rev per mile. Load your tune with 775, have a passenger with GPS on their cell phone. Go 60 mph on your Mustang and see what the gps on the cell phone is showing. Then you can make adjustments.
David Young is offline  
Reply With Quote
Old 8/18/18, 01:03 PM
  #3  
Cobra Member
 
tukatz's Avatar
 
Join Date: January 4, 2013
Location: Frisco, TX
Posts: 1,251
Thanks: 0
Thanked 8 Times in 7 Posts
Tirerack.com agrees with Goodyear - 775.
tukatz is offline  
Reply With Quote
Old 8/18/18, 03:19 PM
  #4  
GTR Member
Thread Starter
 
m05fastbackGT's Avatar
 
Join Date: May 11, 2006
Location: Carnegie, PA
Posts: 6,130
Thanked 216 Times in 206 Posts
Originally Posted by David Young View Post
I would believe Goodyear for the rev per mile. Load your tune with 775, have a passenger with GPS on their cell phone. Go 60 mph on your Mustang and see what the gps on the cell phone is showing. Then you can make adjustments.
Thanks, David. I'll have a friend of mine ride along and do a test run with his GPS and see what it shows compared to the speedo at 60MPH

Update! as of 8/18/18. David, here's the latest info. I loaded the tune at 775 as recommended by Goodyear, did a test run comparison with the speedo and from a friend's GPS. The speedo read 100 mph in 5th gear at 2000 RPM whereas the GPS read 65 mph. Needless to say, the speedo was way off by 35 mph set at 775 RPM. We then reset the revs per mile at 748 as recommended by TireSize.com. After we reset it to 748 revs per mile, the speedo is now within 4-5 mph of the GPS actual readout speed at 60 mph. At any rate, it appears that TireSize.com was spot on about how Goodyear does not take into account that revs per mile are not the same when it comes to unloaded vs installed onto a vehicle when under actual load.

Originally Posted by tukatz View Post
Tirerack.com agrees with Goodyear - 775.
Just keep in mind that what Goodyear and Tire Rack doesn't mention is, their specs are based from tires mounted on an unloaded measured rim. Therefore they are not taking into consideration what the true revs per mile are when being installed on an actual vehicle that is under full load. According to Brenspeed and VMP, they go by the specs listed by TireSize.com and American Muscle also lists their rev specs identical to Brenspeed and VMP as well. Anyhow, just saying

Last edited by m05fastbackGT; 8/19/18 at 10:37 PM.
m05fastbackGT is offline  
Reply With Quote
 
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
iceD
For Sale and Wanted
20
12/2/13 07:56 PM
GRAYPNY
Parts For Sale
1
9/19/10 11:19 AM
Driver72
Parts For Sale
5
8/18/10 09:59 AM
Driver72
Parts For Sale
8
7/30/10 10:49 AM
FAREED ALGHAMDI
GT Performance Mods
8
4/5/08 08:30 PM


Thread Tools
Search this Thread
Quick Reply: Need help with rev per mile specs for goodyear eagle f1 supercar tires in 285/40/18


Featured Sponsors

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

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.