tire question

monterey · 03-13-2016, 11:26 AM

Is it bad to run one new tire along with one with 50% wear? I heard this is bad for the differential.

Arben · 03-13-2016, 04:09 PM

Yes, you have to replace both tires on the same axle. Unless you get it shave, tire rack offers that.

dparm · 03-13-2016, 04:15 PM

Quote:

Originally Posted by Arben

Yes, you have to replace both tires on the same axle. Unless you get it shave, tire rack offers that.

Bingo. It might also cause some funkiness with DSC since the speed sensors are going to see very different rotational rates. Might also cause excess heat in the LSD because it is a speed-sensitive unit.

leopard print · 03-13-2016, 06:12 PM

Sorry to hijack the thread. But I have almost new tires on the rears with less than 1k miles. I got a puncture on one and cannot be repaired. Can I just replace the one since the other is nearly new or should I still replace both?

roastbeef · 03-13-2016, 08:20 PM

Quote:

Originally Posted by leopard print

Sorry to hijack the thread. But I have almost new tires on the rears with less than 1k miles. I got a puncture on one and cannot be repaired. Can I just replace the one since the other is nearly new or should I still replace both?

you'll be fine.

something like 50% and 100% like the scenario the OP posted isn't ideal.

leopard print · 03-13-2016, 08:42 PM

Quote:

Originally Posted by roastbeef

you'll be fine.

something like 50% and 100% like the scenario the OP posted isn't ideal.

Thank you sir! I figured I would be ok but I just wanted to be certain.

dparm · 03-14-2016, 08:17 AM

Quote:

Originally Posted by leopard print

Sorry to hijack the thread. But I have almost new tires on the rears with less than 1k miles. I got a puncture on one and cannot be repaired. Can I just replace the one since the other is nearly new or should I still replace both?

You can probably just replace the one.

Thik · 03-14-2016, 08:30 AM

I had a puncture on one of the rears and replaced only one. The old one had only 10K miles on it. It was fine when both were still relatively new. Now that one is almost worn out and the other one has some tread left, the car is twitchy under acceleration.

So not ideal, but I wasn't gonna replace a perfectly good tire with only 10k at the time.

monterey · 03-14-2016, 08:55 AM

Mine has about a 1/8" difference in thread. Should i worry?

Flying Ace · 03-14-2016, 01:58 PM

Quote:

Originally Posted by monterey

Mine has about a 1/8" difference in thread. Should i worry?

1/8 as in 4/32nds? Likely not. Think about what 1/8 measures to in terms of overall rolling diameter. You can be off 1/8 by having a 5 psi difference between the two tires.

Also, are you measuring tread depth properly? You will realize inner channel/rib, middle channel/rib, outer channel/rib measurements can vary by 2/32nds

03-13-2016, 11:26 AM	#1
monterey Major 339 Rep 1,239 Posts Drives: 2008 M3 Join Date: Mar 2016 Location: United States iTrader: (1)	tire question Is it bad to run one new tire along with one with 50% wear? I heard this is bad for the differential. __________________ A job is nothing but work.
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03-13-2016, 04:09 PM	#2
Arben Dunce Cap 6 Rep 75 Posts Drives: '12 E92 M Join Date: Sep 2014 Location: IL iTrader: (0)	Yes, you have to replace both tires on the same axle. Unless you get it shave, tire rack offers that.
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03-13-2016, 06:12 PM	#4
leopard print Lieutenant 1570 Rep 390 Posts Drives: Really well for an Asian. Join Date: Jan 2016 Location: Los Angeles, CA iTrader: (5)	Sorry to hijack the thread. But I have almost new tires on the rears with less than 1k miles. I got a puncture on one and cannot be repaired. Can I just replace the one since the other is nearly new or should I still replace both?
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03-14-2016, 08:30 AM	#8
Thik First Lieutenant 140 Rep 371 Posts Drives: 2010 Space Grey E92 M3 6spd Join Date: Jan 2013 Location: Toronto iTrader: (0)	I had a puncture on one of the rears and replaced only one. The old one had only 10K miles on it. It was fine when both were still relatively new. Now that one is almost worn out and the other one has some tread left, the car is twitchy under acceleration. So not ideal, but I wasn't gonna replace a perfectly good tire with only 10k at the time. __________________ Check out my YouTube channel chronicling all the driving fun in my E92 M3!
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03-14-2016, 08:55 AM	#9
monterey Major 339 Rep 1,239 Posts Drives: 2008 M3 Join Date: Mar 2016 Location: United States iTrader: (1)	Mine has about a 1/8" difference in thread. Should i worry?
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