Brit-Car-Nut wrote:The M100 spare has a huge offset compared to a lot of US ones. measure your rim first or bring it with you for comparison.
I can't comment on US availability of wheels - it isn't really something I've had to worry about.....
....just a thought following on though - if the offset is different, it will obviously affect whether it fits over the callipers/discs, but other than that (and hitting on the wheelarch) it isn't a big worry....
....affects on ride and handling are fairly irrellevant!
I can actually see very few times when a 'spare' is really needed (but again, distances are often somewhat different in USA, and I'm unsure of suitable tyre size general availability).
We have very good rescue/recovery systems in UK (and covering Europe) who will collect the car from anywhere and take it somewhere else (home or repair) - not ideal at the side of a busy road at night, or stuck in the middle of no-where with no phone signal - which is when I may consider a spare.
If it's only to go a mile or 2, then the current spacesaver you have with a crap tyre would do the job (at very low speed) - even with a flat tyre.
Maybe a wheel that you can get in USA could be bolted onto the hub 'backwards' so it can be used for a short/slow journey???
Obviously, common sence says that any 'mismatched' spare (spacesaver or otherwise) should go on the back axle - even if it means swapping 2 wheels at the side of the road, and the car should be driven at speeds within it's capabilities.
TBH, as it would take about an hour to empty the boot, jack up the car, put spare on rear, put rear tyre on burst front wheel, repack everything into the boot (as the burst tyre/wheel won't go into the space the spare lives in, so will end up in front passenger footwell (with wife having to hitch a lift

)....
....I'd rather sit in the pub and wait for the recovery truck!
Oh, and one more thought, any sudden/catastrophic failure of the tyre will probably make the wheel damaged, at least cosmetically - but if it's structurally as well, then the car would need to go home on a truck anyway - so any incident more than say 20 miles from home wouldn't be worth the effort of fitting the spare...
....but as I say, distances etc are different for you - and if i knacker a wheel, others are easly available to UK residents - so I may even just drive slowly on a flat tyre to get me to a 'safe' location to wait for the truck.