Mismatched Tire Sizes on Drive Axle? Problem or Not?

[Broseph Stalin]

The reason I ask is I have a stock 225/60/16 spare and 225/70/16's on each corner. Those are apx 1" taller than stock.

I've heard that having mismatched tires can ruin a differential, something I did not know. So bad idea to mismatch, or workable with only 1" difference?
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'68 Bus in West Germany, 1977-1979
'67 Riviera poptop conversion in the US, 1984-1990
'95 EVC Winnie, 2018, Sold
'03 EVC Winnie, 2018, Sold

[RichBenn]

I would replace one as soon as possible. Besides any transaxle stress, emergency handling could be an issue.

Edit - if it's only the spare, you never have those on long enough to be a problem, IMHO
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Rich

[Abscate]

You can run that until the cows come home.
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.ssS!

[Broseph Stalin]

Thanks for the replies. Yeah, it would only be the spare, and I could put one of the rear tires on the front.

Actually I shouldn't make a big deal out of putting a matching 225/7016 tire on the spare wheel. Probably the smart thing to do.
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'68 Bus in West Germany, 1977-1979
'67 Riviera poptop conversion in the US, 1984-1990
'95 EVC Winnie, 2018, Sold
'03 EVC Winnie, 2018, Sold

[TDCTDI]

Since the differential is not a locking or limited slip unit, it will be fine. This could cause some confusion/weirdness with the ABS system though.

There’s nothing like the ABS grabbing the brake on one side when you least expect it.
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[Broseph Stalin]

[Broseph Stalin]

2003 EVC, looked at the spare tire carrier, there isn't much room for a larger diameter tire. Stock 225/60/16 is 26.63" diameter, 225/70/16 is 28.4" diameter. https://www.tacomaworld.com/tirecalc?tires=225-60r16-225-70r16

Eyeballing the clearance available with the stock spare in the carrier there's maybe 1" more space available.
_________________
'68 Bus in West Germany, 1977-1979
'67 Riviera poptop conversion in the US, 1984-1990
'95 EVC Winnie, 2018, Sold
'03 EVC Winnie, 2018, Sold