Wheels and Tires All things related to Miata Wheels and Tires.
Sponsored by:
Sponsored by:

Inside tire wear pattern question

 
Old 06-23-2015, 12:52 AM
  #1  
Junior Member
Thread Starter
iTrader: (9)
 
Join Date: Dec 2011
Location: SFBay
Posts: 342
Total Cats: 40
Default Inside tire wear pattern question

My BFG Rivals (225 on 15x9 6ULs and 949 Big Grip Kit) are wearing strangely during the most recent track day.
The outside edge of the tires are wearing nice and evenly, but the inside edge looks like it's barely wearing at all.
Camber is -2.4 in the front and -2.2 in the back

Is this normal/expected? Thanks.

Inside rear. (also: yay tread splice)



Inside front.



Outside wear, for reference




Attached Thumbnails Inside tire wear pattern question-80-img_20150621_105341_601fe81f18d00f28aabd1668eaa0dcf3aff5f8b3.jpg   Inside tire wear pattern question-80-img_20150621_105445_7a50746cdffc7c96959a82e78d71bf6aa8b6ac18.jpg   Inside tire wear pattern question-80-img_20150621_105450_fdb7a82f28f888d04f0c673aec75b087a3b423ce.jpg   Inside tire wear pattern question-80-img_20150621_105858_535b72a4a88bda16cb37859a3317b6c76c401e20.jpg  
scenturion is offline  
Old 06-23-2015, 02:32 AM
  #2  
Junior Member
 
Join Date: Jun 2014
Location: Purga, Queensland, Australia
Posts: 76
Total Cats: 6
Default

No wear on the inside would suggest lack of negative camber. Feathered edge on the outside would suggest a toe issue. What is the toe setting also do you have access to a pyrometer?

Here are two pictures of the same tyres on the same car with the same pressures but different alignments.




Attached Thumbnails Inside tire wear pattern question-80-ec_d08737e2fd52c2c0605c1374a0406c8e1b373c77.jpg   Inside tire wear pattern question-80-qr_008de68a1aa9d203e69990596ee31ba7e646cbe4.jpg  
Eipgam is offline  
Old 06-23-2015, 11:54 AM
  #3  
Junior Member
Thread Starter
iTrader: (9)
 
Join Date: Dec 2011
Location: SFBay
Posts: 342
Total Cats: 40
Default

Thanks for the reply. Here's my alignment sheet. Toe is set to 0 across the board.

I use a pyrometer to set my tire pressures at the track. I was getting an ~15 degF delta from outside to center on all tires (outside: 128F center: 140F inside 140F)
scenturion is offline  
Old 06-23-2015, 03:21 PM
  #4  
Junior Member
 
Join Date: Jun 2014
Location: Purga, Queensland, Australia
Posts: 76
Total Cats: 6
Default

you should be aiming for no more than about 20 deg diff between outside to inside. If the inner is hotter than the outside too much negative camber. Outer edge hotter than inner not enough neg camber or too much toe in. Centre hotter than edges over inflated, centre cooler than edges under inflated.

151, 141, 133 are temps from my data. The average is 141.7 and I could decrease pressure or decrease negative camber. However you also need to look at the difference in the average temps of the front and rear.
Eipgam is offline  
Old 06-24-2015, 11:49 AM
  #5  
Supporting Vendor
iTrader: (3)
 
emilio700's Avatar
 
Join Date: May 2005
Posts: 6,029
Total Cats: 1,745
Default

Originally Posted by Eipgam View Post
you should be aiming for no more than about 20 deg diff between outside to inside. If the inner is hotter than the outside too much negative camber. Outer edge hotter than inner not enough neg camber or too much toe in. Centre hotter than edges over inflated, centre cooler than edges under inflated.
That has not been my experience.

Using a tire pyrometer-949 Racing


The OP's tires look fine to me.
__________________


www.facebook.com/SuperMiata

949RACING.COM Home of the 6UL wheel

.27 SNR
emilio700 is offline  
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
bigmackloud
Miata parts for sale/trade
16
03-03-2019 03:41 PM
emilio700
Wheels and Tires
151
06-02-2017 02:36 PM
Corky Bell
Prefabbed Turbo Kits
18
11-22-2016 09:01 PM
Quinn
Cars for sale/trade
6
10-23-2016 07:58 AM
Frank_and_Beans
Supercharger Discussion
13
09-12-2016 08:17 PM


Thread Tools
Search this Thread
Quick Reply: Inside tire wear pattern question


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.