Getting a matching spare for upsized tires: what is Jeep's spec for a 'match'? - Jeep Garage - Jeep Forum

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Old 08-30-2016, 07:47 PM
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Getting a matching spare for upsized tires: what is Jeep's spec for a 'match'?

I have upsized my tires and I need to upsize my spare tire so that its circumference (or OD, or RPMs / revs per mile) matches the other tires. If they don't match, then the 4WD system will sense the difference and might think there is slippage and will want to compensate - not good. The question is, what is Jeep's specification on how different the tires can be and still 'match', and where is that documented? For example, must the RPMs be within 5% of each other? I imagine that specification is defined for each 4WD system. I have Quadra-Drive 2 on my 2016 WK2.

For Goodyear Wrangler Duratracs:

275/55-20: 31.9" O.D., 655 RPMs - I have these tires mounted
255/70-18: 32.1" O.D., 651 RPMs - the spare tire I plan to get, on the OEM 18" wheel

Those tires are probably close enough to be a match, but I want to know what the Jeep requirement is. My current spare is 10.5" wide, and the Duratrac spare would be 10.2" wide, so it should fit in the spare tire case, and the case's lid should close fully flat.

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Old 08-30-2016, 11:32 PM
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Re: Getting a matching spare for upsized tires: what is Jeep's spec for a 'match'?

I too run the DuraTracs - I found too
like them better than the KO2s I had for 6 months. Running 18" wheels I have 275/65R18 on all for corners, and for the spare I have a 255/70R18. Dimensionally it is the same size tyre(almost), but narrower as to fit in the wheel compartment with the cover closed.
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Old 11-26-2016, 02:21 PM
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Re: Getting a matching spare for upsized tires: what is Jeep's spec for a 'match'?

To resolve this question,
Quote:
Originally Posted by echo7tango View Post
Bottom line is, we should be good if we're within 3% (for O.D.), as GoPlzGo and Milous have also said.
Some details are in Sibze's thread here: Is .8" difference ok for spare?
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