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Using 275/65r18 spare tire with 3 other 275/70r18s - long term

Cartgreg

Member
First Name
Greg
Joined
Jan 12, 2022
Threads
2
Messages
13
Reaction score
8
Location
Las Vegas
Vehicles
2021 F-150 XLT FX4 302A
Occupation
Commercial Windows
I had new 275/70r18 Firestone Destination X/Ts installed on Monday. Tuesday morning 1 rear tire was flat due to defective tire. I am now riding on a spare and thanks to me buying a hard to find / low inventory tire I will need to drive this way until a new tire is shipped in from out of state.

If I have the smaller spare on my rear axle could this cause damage to my transmission? 50+ mile commute per day, in slow lane to be safe. The size difference isn't huge (1.5" measured) but still concerning. Might relocate spare to front axle in the morning.

Side note: this does make me sorta glad I didn't go to a 34"+ tire like I truly wanted for appearance purposes. Not sure at what point the spare tire diameter should be increased to avoid this lack of inventory situation.
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