New rear tires, loose steering, tire squirm

cjwsrt6 · 06-30-2017, 11:06 AM

Check alignment and pressures. I've ran different front and rear on multiple cars with multiple sizes and brands and never had an issue that scared me. Now I do have toe out in front slightly and on roads that aren't flat it will move slightly even with matching continental dw's, so that's why I'd check alignments out, firestone lifetime is usually 180, I get mine done every 6 months or when I change tires so usually 4-6 times a year

Nixin · 06-30-2017, 11:49 AM

You might also want to check the lug nuts. I have seen techs just tighten by hand and forget to torque them down.

Chuck33079 · 06-30-2017, 11:56 AM

Quote:

Originally Posted by Nixin

You might also want to check the lug nuts. I have seen techs just tighten by hand and forget to torque them down.

Or zap them down with the impact and now you have to jump on the damn lug wrench to break them loose when you have a flat. There are only two torque specs for lug nuts to the average tire monkey - finger tight or 500ft-lbs.

Spooler · 06-30-2017, 12:16 PM

Yeap, this happened to me when I installed Bridgstone S04's on the rear and had the factory Advans up front. They should be better after some breakin but it will still feel off a bit. You should have just bought a set of Bridgestone SO4's all around. They are good tires for the money.

Rusty · 06-30-2017, 09:25 PM

Quote:

Originally Posted by gomer_110

This phenomenon has been discussed many times before on here. If you did a search you'd find out that when you mix noticeably different tread pattern and compound tires front and rear the handling of the car can turn to sh!t.

You have tires with different constructions.

ChaseZ · 06-30-2017, 10:40 PM

Unless you want to intentionally invoke understeer or oversteer depending on your car setup, experience and mastery of the skinny pedal

Different tires front and rear aren't always a bad thing.

TreeSemdyZee · 07-01-2017, 04:13 PM

Quote:

Originally Posted by cloudofevil

Also, check your tire pressures on all 4 corners.

Definitely. Most tire stores don't put in the right amount.
Specs on our car is 35 pounds cold.

Sent from my iPhone using Tapatalk

bthomas87 · 07-06-2017, 08:12 PM

Got a few hundred miles on them now and they're doing much better. I also increased the rears to 36psi which also helped.
These firestones are actually pretty good. They're very quiet. These tires really hook up nice and it launches better than ever, which I try not to do often...
Still gonna swap out the front ones soon though just to have the same tires all the way around.
Thanks for all the suggestions!

06-30-2017, 11:49 AM	#17 (permalink)
Nixin A True Z Fanatic Join Date: Sep 2015 Location: GWN Posts: 3,488 Drives: Goodbye Z! Rep Power: 19832	You might also want to check the lug nuts. I have seen techs just tighten by hand and forget to torque them down. TreeSemdyZee likes this.

06-30-2017, 12:16 PM	#19 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,512 Drives: 2013 Nismo 370z Rep Power: 2684391	Yeap, this happened to me when I installed Bridgstone S04's on the rear and had the factory Advans up front. They should be better after some breakin but it will still feel off a bit. You should have just bought a set of Bridgestone SO4's all around. They are good tires for the money. Rusty and Hotrodz like this.

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06-30-2017, 11:06 AM	#16 (permalink)
cjwsrt6 Enthusiast Member Join Date: Apr 2014 Location: Alabama Posts: 452 Drives: 2005 crossfire Srt6 Rep Power: 10	Check alignment and pressures. I've ran different front and rear on multiple cars with multiple sizes and brands and never had an issue that scared me. Now I do have toe out in front slightly and on roads that aren't flat it will move slightly even with matching continental dw's, so that's why I'd check alignments out, firestone lifetime is usually 180, I get mine done every 6 months or when I change tires so usually 4-6 times a year

06-30-2017, 10:40 PM	#21 (permalink)
ChaseZ A True Z Fanatic Join Date: May 2016 Location: Calgary Posts: 3,799 Drives: 16 370z Rep Power: 94682	Unless you want to intentionally invoke understeer or oversteer depending on your car setup, experience and mastery of the skinny pedal Different tires front and rear aren't always a bad thing.

07-06-2017, 08:12 PM	#23 (permalink)
bthomas87 Base Member Join Date: Aug 2015 Location: Cincinnati, OH Posts: 77 Drives: 94' GMC Sierra Rep Power: 9	Got a few hundred miles on them now and they're doing much better. I also increased the rears to 36psi which also helped. These firestones are actually pretty good. They're very quiet. These tires really hook up nice and it launches better than ever, which I try not to do often... Still gonna swap out the front ones soon though just to have the same tires all the way around. Thanks for all the suggestions!