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Old 05-07-2020, 03:06 PM   #11
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Originally Posted by Twoxentrix View Post
Obviously I/we haven't seen the "chunk" that was taken from the tire, so can only speculate is wouldn't be considered "safe" as a spare either.
Consider purchasing just ONE new tire for the front, and mount your unused spare on the other front. Then use the good used tire as your spare ???
I agree that this is a good idea. that way, everything remains balanced. In fact, that is a good reason to keep the spare new. I hadn't thought of that!



WRT tire rotation, I asked my local Mercedes dealer about rotating tires on our Sprinter. The manual says one thing, but the dealer recommended not rotating the tires at all, to my surprise. The tech said that each gets its own wear pattern, and that mixing them up will affect handling.


Huh.

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Old 05-07-2020, 03:35 PM   #12
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"Consider purchasing just ONE new tire for the front, and mount your unused spare on the other front. Then use the good used tire as your spare ???"

If there is a big difference in size from new/spare to the used tires, now instead of mixing the tires on an axle and stressing the limited slip clutches, you have moved that same issue to the transfercase. Like having two different axle ratios, only on a much smaller scale. Would only be a problem if all four tires were getting good traction and none of them could "slip".
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Old 05-07-2020, 06:40 PM   #13
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Originally Posted by Lilnuts2 View Post
If there is a big difference in size from new/spare to the used tires, now instead of mixing the tires on an axle and stressing the limited slip clutches, you have moved that same issue to the transfercase. Like having two different axle ratios, only on a much smaller scale. Would only be a problem if all four tires were getting good traction and none of them could "slip".
1) Sure, but you shouldn't use 4x4 on pavement unless it's snow or ice covered so this is unlikely to be an issue. If you need 4x4, it implies traction is reduced so a small tire size differential should be inconsequential. At least on a true 4x4 T-Case like the NV271 or Atlas. Absolutely could be a problem an AWD Transfer-case, including the MB system which is planetary based and I'm pretty sure the owner's manual states to replace all tires at the same time.

2) A real T-case can tolerate quite a bit of torque differential. You'd probably see the stress in diffs still, by higher temps if you were measuring. To a point anyways. Running it long enough on dry pavement will cause it to exploderate, especially if there's no fluid it it (which best we could tell, is how this one shifted itself into 4x4 on the freeway).
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Old 05-07-2020, 08:05 PM   #14
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carringb, I completely agree. I was thinking more like a slick rock type trail, which is very hard on drivetrains
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