The Saab Link Forums - Reply to Topic

Go Back   The Saab Link Forums > Saab NG900 '94-'98 and 9-3 '99-'02 Forum > General NG900 / Old 9-3 Posts and Information > KDW2's flat spotting over night?

General NG900 / Old 9-3 Posts and Information Please post general topics pertaining to the NG900 and old 9-3.

SaabLink.net is the premier Saab Forum on the internet. Registered Users do not see the above ads.
Thread: KDW2's flat spotting over night? Reply to Thread
Title:
  
Message:
Trackback
Send Trackbacks to (Separate multiple URLs with spaces):
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the The Saab Link 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:
Vehicle Info.
Enter your vehicle information (year, model, mods)
Insurance
Please select your insurance company (Optional)

Log-in


Additional Options
Miscellaneous Options

Topic Review (Newest First)
05-29-2009 01:37 PM
nowhereman my tires shake.. but that is because they are chopped... and the heavy super aeros haven't been balanced correctly.

i had this happen on my eclipse though... in ND it got to 20 at night and 120 in the day so really big swing... plus i would drive it like i stole it home and then park it so i am sure that didn't help.

on the balancing.. where should i go in the Milford NH area to have the wheels balanced right and the weights put on the inside...?
05-29-2009 01:26 PM
Legit Tires with a softer sidewall will do this, more so when it's cold
05-29-2009 12:23 PM
turbojohnny my cooper zeon 2xs tires do the same thing when they're cold
05-29-2009 12:21 PM
iwantaviggen mine has been sitting for months and no problems at all..
bad batch?
05-27-2009 12:51 PM
Moonracer We actually had a 03 9-5 Aero bought back because of tires flat spotting. We tried differant tires and no mater what we did the tires would flat spot over night. The customer lived on a NEW black top road, so every morning he went to work it shook, by the time he came home the tires were warm when he hit the smooth road. It was very frustrating as the customer was a good friend of ours
05-27-2009 12:24 PM
Adub I had Yokohama AVS ES100s on my old Honda, did the same thing. I worked overnight, and the ride home was rough, but after a drive they were fine.
05-27-2009 11:06 AM
christian900se Get some F1 tire blankets
05-27-2009 08:36 AM
Ice Man Forgot to mention the tires were road force balanced this spring. Wheels are straight.

Ok, so others notice this too. I guess I will have to work some heat in the tires like the F1 drivers do before the start.
05-27-2009 08:18 AM
ohlins8990 Even the BFG gforce sports I have on my Aero do it, but prob not as bad as KDW's
05-27-2009 08:01 AM
k1llsh0rty we have the same tires on the g/f's car and we have the same issue. the issue usually goes away while driving. and yes this is related to temperature. we noticed that once you drive the car a little aggressively and get the temp back up in the tires they ride just fine.

Casey
05-27-2009 07:50 AM
spgstud are you sure its not a bent wheel?
05-27-2009 07:46 AM
Ice Man
KDW2's flat spotting over night?

Some mornings I seem to get the wheel shake of an unbalanced wheels and on the commute home they are fine. I guess these tires are flat spotting over night on the cool concrete floor and are fine as the ambient temps come up thru the day.

Anyone else experience this? It's really frigging annoying. Maybe I can park on some thick cardboard to see if it makes a difference.


From Tire Rack:

Do you ever feel a ride disturbance or shimmy during the first few miles of driving after your vehicle has been parked for a few days, weeks or months? Then, after you drive a couple of miles, the ride smoothes out and feels OK. This condition is often called flatspotting because it is used to describe the tire flatspots that can occur when a vehicle is parked.

Many heavy duty, high performance, high speed rated and racing tires have a memory because they continue to remember the position in which they were last parked after they begin to be driven on again. Unfortunately, their memory can become a problem when the tires experience big swings in ambient temperature, have been parked overnight in cold temperatures, or parked for an extended period of time...because it's a lack of use that can cause tires to flatspot.

As they roll, tires go from a relaxed state to a loaded state about 800 times every mile. This constant deflection generates heat that makes the tires more flexible. But once they are parked, the spot in contact with the ground (the tire's footprint) flattens as it is pressed against the road's flat surface as the tires cool. This is what generates flatspots. And until the tires "warm up" again, the flatspot on each tire can cause a ride disturbance that will be felt for the first few miles the next time the vehicle is driven.

Flatspotting can be temporary (the tire will round out as driving warms it up) or in the most severe cases, permanent (in which the tire's memory effectively destroys its ride quality). A flatspot's severity is often a function of the tire size, internal structure, load, ambient temperature and time.

Low aspect ratio tires have less sidewall flex due to their short sidewalls and much of their load carrying capacity is absorbed by the deflection of their wide footprints.

The tread compounds and firm, nylon reinforced internal constructions used on high performance and high speed rated tires are more susceptible to flatspotting.

Heavy loads and too little air pressure in the tires (underinflation) will allow them to deflect more where they come into contact with the ground. This allows even more deflection, increasing the severity of the flatspotting.

Cold ambient temperatures make rubber compounds stiffer, increasing their tendency to flatspot.

The longer tires remain stationary, the better they remember the position in which they were last parked. Tires on vehicles stored on the ground for many months can be permanently flatspotted.

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


All times are GMT -8. The time now is 10:53 PM.


Powered by vBulletin® Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Friendly URLs by vBSEO 3.5.2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
All content is copyright The Saab Link and it's original authors.


 

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.