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This first was drilled home to me when I got to thinking about the real issues as far as the effects in real world driving. My Subaru WRX is also my trailer puller for my dirt bikes. So say I am on the road heading for a race on a Saturday morning maybe a 100 miles from home. Halfway there I get a flat on the car. So what would the space-saver 'spare' do for me? Basically I would not be racing that day.This is why I bought a factory wheel/tire the same as the car was using and made accommodations for it to be secured in the back. Gone is the donut!
Don't you have tire-repair stuff in the dirt-bike tool kit? Throw a tube (er, maybe two) in that Subaru tire, wrap it in safety wire, and you should be able to make the race..