I'm keeping my spare in the boot, had too many incidents to prove its worth.
I was coming back from France last year when in some small town I hit a sticking out bit of high curb and bulged the sidewall of the tyre.
The peace of mind from being able to change it was priceless.
Years ago when I was driving to Barcelona in a volvo, I took 2 full size alloy spares, only used one
