Difference between daily tires and spare?

Escape2Bronco

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Well I just learned DT buys back tires. I don't know if it's all locations and all tires. But if this is the case, at least I would get something for the other 3 tires.
Depends on the location. I have a brand new Scorpion on a steelie that was my spare that I was hoping to trade in. Now it's being used as a weight to keep my garage ceiling floor from flying away.
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Escape2Bronco

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I know. But will be using 235 70 17 instead, 29" vs 30"
I have a measurement somewhere on here. It's 29.5 I believe for the Badlands. Mine fits with a little room to spare.
 

Escape2Bronco

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What tire you are using on yours, Escapetobronco? And thanks for sharing info
The optional 236/65-17 Falkens.
 


Escape2Bronco

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Mark, don’t you worry about your garage attic floor flying away in a storm? I’m loading mine up with stuff I’ll never probably use. My wife refers it as hoarding. I’m just listening to all the alarmists stating the storms are getting worse and coming to a neighborhood near you. :cool:
 

PugDad

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bouwmatic

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Well I just learned DT buys back tires. I don't know if it's all locations and all tires. But if this is the case, at least I would get something for the other 3 tires.
Not the one I went to... :frown:
 

Cursed Bronco

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I feel like mine would look so ridiculous riding on the factory spare that I would consider just towing it to the tire shop to avoid the embarrassment :cwl:
 


Wolf256

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I feel like mine would look so ridiculous riding on the factory spare that I would consider just towing it to the tire shop to avoid the embarrassment :cwl:
I avoided that by buying a matching wheel and putting the same tire on it. I added a TPMS to it. I also plan to do 5 tire rotations. I’m not very hard on tires.
 

watt-man

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Just bought a '25 Bronco Sport for the wife, so I'm new here. I was surprised that the stock tire diameter is nearly 29 inches, but the donut-spare (155/70-17) is 3 inches smaller (under 26)! I have no experience with 'new car' RDU / PTU function (I'm used to Traction-Lok units from the past that wear out when you mess with dis-similar diameters) - so I wonder why Ford didn't have the donut-spare at a 155/90-17 instead. It would put the diameter much, much closer. Or a 165/90-17 to really nail the diameter, but I don't want to get into a tire-width discussion and full-size spares.

So it would seem that Ford feels the 10% difference in tire diameters is "bad enough you should repair it right away"... yet they could have just reduced this difference to 1% or 2% by upsizing the donut-spare sidewall height slightly - (in fact, the 90 series sidewall tire is cheaper at Discount than the 70 series!).

Text from the owners manual is attached. Being okay with a donut-spare width, I'm inclined to spring for a 90-series sidewall tire on the donut-rim on a '35,000-dollar-loaded-with-4WD-electronics' car. Just wondered if others have any proof that the 3" tire diameter doesn't cause damage, even though Ford thinks it's a big enough deal to put it in the manual. This seems to be conflicting advice, I think I'll rest easier with a 155/90 or 165/90.

Thanks in advance.

Ford Bronco Sport Difference between daily tires and spare? Spare in Manual.JPG
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