tire problem - Alfa Romeo Bulletin Board & Forums

 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 02-09-2017, 09:03 PM Thread Starter
Registered User
 
lotuseleven's Avatar
 
Join Date: Sep 2009
Posts: 481
tire problem

My GTV has developed a persistent shake at speeds above around 35 mph, noticeable through the steering wheel. after looking at bearings and other suspension parts, I looked at the front tires. in the attached pic, is this tread separation or something else? I swapped the fronts, which both showed this damage, for the rears, which were better. I still feel some vibration, but not nearly as bad. new set of dunlops on the way from tirerack, but I'm curious about what caused this damage. any ideas?
Attached Images
 

Stan Swanson, Eerie Erie, Colorado, '67 GTV (daily driver), '71 GTV (Kyle's), '91 164 (snow car), '56 Lotus 11(gone to Oz), '59 Cadillac M+M Hearse, '74 MGB
lotuseleven is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 02-09-2017, 09:34 PM
But Mad North-Northwest
Platinum Subscriber
 
Gubi's Avatar
 
Join Date: Sep 2003
Location: SF Bay Area, CA
Posts: 8,400
Wow: those look defective. How old are they? There should be a date code on the side.

Tom

1991 Spider
1963 Giulia Spider (1750 engine)
Gubi is online now  
post #3 of 7 (permalink) Old 02-10-2017, 07:58 AM Thread Starter
Registered User
 
lotuseleven's Avatar
 
Join Date: Sep 2009
Posts: 481
Quote:
Originally Posted by Gubi View Post
Wow: those look defective. How old are they? There should be a date code on the side.
date code is 0509, so Feb '09. tires are Dunlop Dirizza Z1, 195-55-15, they all show some degree of this damage, although the two that were on the front wheels were worse. tires never over-inflated, typically run them at around 24psi (much more and they get pretty harsh and start loosing grip).

Stan Swanson, Eerie Erie, Colorado, '67 GTV (daily driver), '71 GTV (Kyle's), '91 164 (snow car), '56 Lotus 11(gone to Oz), '59 Cadillac M+M Hearse, '74 MGB
lotuseleven is offline  
 
post #4 of 7 (permalink) Old 02-10-2017, 09:01 AM
Moderator
Platinum SubscriberModerator
 
Gordon Raymond's Avatar
 
Join Date: Jul 2006
Location: Northfield, Illinois
Posts: 9,548
The cracking in the sypes is typical of aged-rubber-syndrome, cause by heat, ozone or both.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Gordon Raymond
Illinois SNO Alfa Chapter Director
Illinois SNO Ferrari Chapter Director
and sometimes, CONFUSED AND INCORRECT, but Larry helps me out.
Now:
Illinois Chapter Director AND Charter Member of THE CONFUSED AND INCORRECT
Gordon Raymond is offline  
post #5 of 7 (permalink) Old 02-10-2017, 04:32 PM Thread Starter
Registered User
 
lotuseleven's Avatar
 
Join Date: Sep 2009
Posts: 481
or possible cold-related? this is from a TireRack tech article,

"If ambient temperatures drop to near- or below-freezing, driving or rolling a vehicle equipped with summer performance tires risks the possibility of tread compound cracking. Tread compound cracking is a permanent condition that requires the tires to be replaced. The other condition that can be caused by running summer performance tires in cold temperatures is the possibility of chipping away the edges of the tread blocks."

these are summer performance tires, and I usually don't drive them in winter because they are awful in snow. This winter I drove on them a lot more than usual after a catastrophic engine failure in my snow vehicle.

here's link to complete article, http://www.tirerack.com/tires/tirete...jsp?techid=273

Stan Swanson, Eerie Erie, Colorado, '67 GTV (daily driver), '71 GTV (Kyle's), '91 164 (snow car), '56 Lotus 11(gone to Oz), '59 Cadillac M+M Hearse, '74 MGB

Last edited by lotuseleven; 02-10-2017 at 04:35 PM.
lotuseleven is offline  
post #6 of 7 (permalink) Old 02-10-2017, 04:48 PM
Moderator
Platinum SubscriberModerator
 
Gordon Raymond's Avatar
 
Join Date: Jul 2006
Location: Northfield, Illinois
Posts: 9,548
I DIDN'T know that! Good to learn. Thanks.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Gordon Raymond
Illinois SNO Alfa Chapter Director
Illinois SNO Ferrari Chapter Director
and sometimes, CONFUSED AND INCORRECT, but Larry helps me out.
Now:
Illinois Chapter Director AND Charter Member of THE CONFUSED AND INCORRECT
Gordon Raymond is offline  
post #7 of 7 (permalink) Old 02-12-2017, 01:23 PM
Registered User
 
divotandtralee's Avatar
 
Join Date: Nov 2005
Location: Cape Cod, MAssachusetts
Posts: 4,989
The "alligatoring" inside the tread is enough for me to say these tires have been toast for a long time.. Did you know these are basically street legal track tires? That alone tells me they aren't expected to give the same life and service of a tire designed for the street. Tire life is issued by the mfr based on many parameters. They don't use extremes to environment or usage to set their warranties nor would one expect this type of compound to deliver the results you would expect of a street tire. Guys run a season on a set of tires and throw them away regardless of whether they are warented much longer. Personally, if you autocross or race, these might be something i would change into at the event otherwise your car will perform better on more conventional stock profiles and you will enjoy the driver feedback better. AFWIW, ever hear about Burman boxes cracking and the PITA that can be. Chalk it up to tires that load it beyond it's tolerances.

Last edited by divotandtralee; 02-12-2017 at 01:29 PM.
divotandtralee is online now  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Alfa Romeo Bulletin Board & Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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 Off
Pingbacks are Off
Refbacks are Off

 
Replace with
For the best viewing experience please update your browser to Google Chrome