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Old 05-06-2013, 08:48 PM
BCRAM BCRAM is offline
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Default 20"tires - 17"spare?

I was crawling under my truck today and noticed that the spare tire is 17" whereas the truck has factory 20" tires.

The question I have: Is the correct? I know that many vehicles come with a smaller/compact spare and normally would not think 2x about using it. However my truck has a limited slip rear end and I would be very hesitant to out a smaller diameter tire on as I would be worried about damage to the LS due to the tire size difference.

That said, due to the factory trailer hitch, there is not much room if any for a bigger tire under there as it looks like the tire would not fit...

Are my concerns justified?
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Old 05-06-2013, 08:52 PM
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RAM EM RAM EM is offline
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Quote:
Originally Posted by BCRAM View Post
I was crawling under my truck today and noticed that the spare tire is 17" whereas the truck has factory 20" tires.

The question I have: Is the correct? I know that many vehicles come with a smaller/compact spare and normally would not think 2x about using it. However my truck has a limited slip rear end and I would be very hesitant to out a smaller diameter tire on as I would be worried about damage to the LS due to the tire size difference.

That said, due to the factory trailer hitch, there is not much room if any for a bigger tire under there as it looks like the tire would not fit...

Are my concerns justified?
The rim diameter is irrelevant, it's the tire's diameter that matters. Your spare is relatively close in diameter to your 20's, and LSD's are forgiving enough for minor differences anyway. It's not like you have a locker or spool. You are completely safe to run your spare.
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Last edited by RAM EM; 05-06-2013 at 08:56 PM.
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Old 05-06-2013, 08:59 PM
BCRAM BCRAM is offline
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The rim diameter is irrelevant, it's the tire's diameter that matters. Your spare is relatively close in diameter to your 20's, and LSD's are forgiving enough for minor differences anyway. It's not like you have a locker or spool. You are completely safe to run your spare.
Thanks, I knew about the rim size and should of mentioned that I was concerned about the tire diameter.

Good to know though as I am planning a month long trip which will be into some remote locations, population wise and I did not want to be stuck if the tire diameter was a major concern.
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Old 05-06-2013, 09:16 PM
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I also have 20" and a 17" spare when I cranked it down and put it beside my wheels on the truck it was the same height. I have 50 series tires on the truck and the spare i think is 85series (huge looking tire)
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