Spare Tire.

[Aren Jay]

I'm just wondering about our spare tires.

I have the little donut spare. I'm thinking about replacing it with an Assurance Comfortred. Sized to be about the size of our rear tires.

I understand that with a flat rear tire our donut spare is only good for about 50 miles before it will do damage to the transmission. But won't hurt if on the front.

I would rather have a spare I could drive home on, even beyond 50 miles, without screwing up the transmission, even if it disables the ABS and TC.

Is this right?

Would a 225 70 16 Goodyear Assurance Comfortred on a steel wheel be better than a donut?

Can you use the larger tire up front without damaging anything?

[Bradley G]

That does not sound right to me.
temp spare on rear will damage trans?

[RoyLPita]

I have one of my original rear tires for my full size spare.

[PonyGuy]

That does not sound right to me.
temp spare on rear will damage trans?

Yes, it can.

Think about it... the rear tires will rotate at different speeds, working the devil out of the differential. And the transmission doesn't know what the actual vehicle speed is...
I can see a lot more potential damage to the differential than the transmission, though. Ideally, with a flat on the rear, you put the donut spare on the front, and you move that front tire to the rear.

Or just call road service... :rolleyes:

[Aren Jay]

I suppose even one front on the back would be bad too, if you had a long way to go. You might have to put both front on the back and then the good rear up front with the donut.

I don't want to play musical spares. I just want a full sized spare.

[magindat]

It is specifically the clutches in the differential that suffer.