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Old 12-26-2005, 11:19 PM   #1
Impreza01
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Question Center Differential: Tread size difference

Recently I had to replace a tire due to a pothole damaging the sidewall. The place I went to only had 2 Pzeroneros. Thus I changed two tires with the fronts being new and the rears being the old ones. Now I asked the mechanic to measure the tread difference. He measured twice and the difference came out as 2 mm.

Is 2mm big enough to create concern for premature center differential wear/tear?
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Old 12-27-2005, 12:23 AM   #2
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Tire Rack says 3/32nds (tread depth difference) ... about 2mm ... you're probably OK.

Best is to order replacement tires from TireRack shaved to match your "leftover" tires.

Last edited by makofoto; 12-27-2005 at 12:43 PM.
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Old 12-27-2005, 12:25 AM   #3
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Xxxxx
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Old 12-27-2005, 10:55 AM   #4
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I believe Subaru states 1/4" ~ 6.35mm so you are fine. The questions is, did the mechanic measure correctly?
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Old 12-27-2005, 12:45 PM   #5
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subaru says 1/4" (6.35mm) in circumfrence.... So that is pi*d wich gives us 4mm difference in d and results in a value of 3.1415*4=12.56... double the acceptable value.

of course you could adjust air pressure to compensate.... (what that will do to your handling Im not too sure)
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Old 12-27-2005, 12:50 PM   #6
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good idea with the tire pressure. For street driving doesn't make that much difference. Oem pressures are too soft anyway ... compromise between comfort and performance.
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Old 12-27-2005, 01:00 PM   #7
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Quote:
Originally Posted by LyveWRX
subaru says 1/4" (6.35mm) in circumfrence.... So that is pi*d wich gives us 4mm difference in d and results in a value of 3.1415*4=12.56... double the acceptable value.

of course you could adjust air pressure to compensate.... (what that will do to your handling Im not too sure)
Ah yes, stand corrected. good catch.
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Old 12-27-2005, 04:22 PM   #8
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Quote:
Originally Posted by subieworx
Ah yes, stand corrected. good catch.
So, when you reduce the air pressure, at what point does the tread 'skip' those few millimeters in it's circumference? can you feel it skip?

;^)

Carl
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Old 12-27-2005, 04:26 PM   #9
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I would increase tire pressure on the "shorter" tires instead of decreasing on the new tires.
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Old 12-27-2005, 04:40 PM   #10
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Quote:
Originally Posted by 1 Lucky Texan
So, when you reduce the air pressure, at what point does the tread 'skip' those few millimeters in it's circumference? can you feel it skip?

;^)

Carl
I was talking about the circumference catch, not the air pressure catch.
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