Can you change a tyre?

[Midnitemo]

I had a puncture last Saturday on my bike whilst I was 120 miles from home....AA came and did a temporary repair with a nifty rubber plug and glue.....would have to be the same were it the car as Vauxhall in there wisdom don't supply a spare(tis on the "options"list though! robbing fekkers) am currently scanning ebay for a used steel for my Antara....yes I can change wheels/tyre's but there is currently no need with the AA at hand only want a spare for the car as its a pain waiting sometimes(late for work etc)