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Old 01-27-2010, 05:11 PM
frodeezy frodeezy is offline
bone stock 2005 fx4
Join Date: Jan 2010
Posts: 47
Default rear end question?

so i have 265\70r\16s on my truck there not the stock size. my spare is a 235 or 245\70\16 i cant reamber, i got a flat and had the spare on the rear for 2 weeks. i was told that i was lucky that i didnt screw up my rear end. Why would the tire size screw up my rear end? The spare was still smaller than the stock tires witch were 255s. I didnt get into it with the micanic becuse i dont no alot about cars. can any one inlighten me about what the micanic might of ment.
i have a 2005 fx4 stock

Last edited by frodeezy; 01-28-2010 at 08:19 AM.
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Old 01-27-2010, 06:00 PM
Johnbaum13 Johnbaum13 is offline
<-----Buzz Killington
Join Date: Jul 2009
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Running different size tires on the same axle will cause undo wear on the spider gears, and if you have limited slip, wear that out. So on a rear wheel drive, you don't want different sizes on the back, with front wheel drive, you don't want it on the front, and with 4 wheel drive, you need them all the same size.

The spare tire is supposed to be used for short distances in an emergency only, and you really should have the same overall diameter on the spare as what you run on the other tires.
I got my Jesus on the dashboard, but the Devil's under my hood!

Last edited by Johnbaum13; 01-27-2010 at 06:04 PM.
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Old 01-27-2010, 06:04 PM
STL STL is offline

Join Date: May 2009
Posts: 23,398

Yup not a good thing to do

it's mechanic by the way
2005 Edge

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Old 01-27-2010, 06:04 PM
blueovelboy blueovelboy is offline
Join Date: Aug 2009
Posts: 1,523

look at it like your always in a turn. the littler tire is always spinning just a little faster and as john said puts undue stress on the axle witch = problems
09 XL reg cab
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