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Differential Failure - Whose had it

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Old 01-15-2017, 01:57 PM
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bigds01
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If my sizing is incorrect on my rears, do tell me and I will swap them asap. The tires are brand new (I installed them this year) on stock rims.
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Old 01-15-2017, 02:11 PM
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Originally Posted by bigds01
If my sizing is incorrect on my rears, do tell me and I will swap them asap. The tires are brand new (I installed them this year) on stock rims.
Owner manual will have exact sizes.
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Old 01-15-2017, 02:12 PM
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Old 01-15-2017, 02:15 PM
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Old 01-15-2017, 02:17 PM
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This should be the correct size and difference.


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Old 01-15-2017, 02:22 PM
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Originally Posted by bigds01
If my sizing is incorrect on my rears, do tell me and I will swap them asap. The tires are brand new (I installed them this year) on stock rims.
You definitely have a greater than 5% difference like TT Surgeon said earlier using the tire sizes posted.
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Old 01-16-2017, 02:28 AM
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Originally Posted by fresh-popcorn
Aren't the rears suppose to be 295/30/19 and not 35?
Something special with snow tires?
Stock rears are 305/30/19
http://www.tirerack.com/tires/Select...Ceramic+brakes
At least they are for my 08 Coupe with PCCBs

Equates to 2.7% Diameter difference front/rear.
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Old 01-16-2017, 03:42 AM
  #23  
TT-911
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The rear tire is wrong and is the reason why your diff got fried.
No doubt about it in my mind. 295/30 would have saved you a lot of money.
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Old 01-16-2017, 12:48 PM
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bigds01
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Order 295/30 replacements. Race shop doing the work wasn't as certain it was an issue since the damage is left to right and not front to back, but for a couple of hundred bucks it is worth covering
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Old 01-16-2017, 10:45 PM
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Originally Posted by TurnOne
Something special with snow tires?
Stock rears are 305/30/19
http://www.tirerack.com/tires/Select...Ceramic+brakes
At least they are for my 08 Coupe with PCCBs

Equates to 2.7% Diameter difference front/rear.
I believe porsche states the difference should be less than 3%, so you're good. Anything more than 5% is dangerous.
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Old 01-17-2017, 08:51 AM
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Dennis C
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Originally Posted by TurnOne
Something special with snow tires?
Stock rears are 305/30/19
http://www.tirerack.com/tires/Select...Ceramic+brakes
At least they are for my 08 Coupe with PCCBs

Equates to 2.7% Diameter difference front/rear.
Snow tires aren't available in a 305 width. I suppose that is the special thing about them that requires a change.
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Old 01-17-2017, 11:32 AM
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bigds01
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Just more of a are you kidding me kind of experience
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Old 01-17-2017, 11:50 AM
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Originally Posted by Dennis C
Snow tires aren't available in a 305 width. I suppose that is the special thing about them that requires a change.
Good info. Thanks!
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