AUDI SPARE COLLAPSIBLE EXPANDING TYRE

[MICKS AUDI SQ5 BEAST]

HI I HAVE A AUDI SQ5 QUATTRO 2015 MODEL. NO SPARE IN THE BACK OF THE BOOT. JUST HAVE THE LIQUID STUFF. I AM BIT WORRIED IF I HAVE A BLOW OUT ON THE MOTORWAY. MY ALLOYS  ON MY CAR ARE 255/40 R21 102Y.  THE TYRES ARE PIRELLI  ZERO . TITANIUM  COLOUR ALLOYS. I AM LOOKING  TO BUY  1 ALLOY WITH  THE PIRELLI ZERO TYRE AS A SPARE.  ALSO I WANT TO   BUY  THE SPARE  COLLAPSIBLE  EXPANDING TYRE WHERE THE SUB WOOFER  FITS IN THE MIDDLE IN THE BACK OF THE BOOT.ANYBODY  KNOWS WHERE I CAN BUY THESE SPARE TYRES.  I PHONED ONE OF THE AUDI DEALERSHIPS THE GUY IN THE PARTS DEPARTMENT SAID THE ONLY WHEEL THEY SELL IS A  COLLAPSIBLE TYRE SIZE 195/75 R18 ACROSS THE WHOLE AUDI  RANGE. THAT IS THE ONLY SIZE THAT WILL FIT MY CAR  . HE SAID IT SHOULD BE OKAY WITH  THE  R21  I HAVE.  HAS ANYBODY BEEN IN THE SAME SITUATION AS ME. ALSO WILL THIS COLLAPSIBLE  TYRE R18 BE SUITABLE FOR MY CAR. I JUST WANT CLARITY ON THIS. I WOULD BE VERY GRATEFUL FOR ANY HELP FROM MY MEMBERS  REGARDS SANTOKH 

[Steve Q]

If it's the only size Audi does then that'll be fine. 

You could look at buying one from eBay instead of audi.