i need to get one of my wheels fixed and don't know if it's a good idea to drive even for a short while on my spare tire. i know having different diameter tires on an AWD is bad for the system but how much damage will i do driving for about 15 miles on the spare?

 

you'll be fine... just make sure it's properly inflated (60psi IIRC) and know you'll get a TPMS warning as a wheel/sensor is missing.

Just follow common sense and allow for extra braking time and maneuvering.

As w/ any car(w/o staggered wheel set up), rotate your wheels so spare is on rear axle not the front.

 

thanks burgboxstr. could you explain why the spare should be on the rear axle?

 

I can... The reason is because youll screw up the alignment of the car... Due to both tires not being the same lol... Tried and test [not the lexus]

 

... more importantly, it's for safety.

The donut spare has a much different and smaller contact patch and likely material composition as well as tread depth, service rating, etc. than stock tires. All of which will adversely affect handling and braking. As such, you'll be able to maintain better control of vehicle w/ it on rear axle especially if it [pick any of the following]: hydroplanes, understeers, skids, blows out, etc.

 

thanks very much burgboxstr and xxgokouxx!

 

I remember i drove on the donut for over 100 miles going 60mph. It doable but it really isnt save. Just drive slow and get it replaced asap.

 

Ohh yeah, and for anyone who's RWD, most definitely DEFINITELY don't put your spare tire in the side of the rear that the rear diff gives power, you'll slide into eternity if you hit the gas just one time wrong.

 

what do you mean "the side the rear diff gives power?"

 

Totally safe after watching this video.