I had my X5 for a couple of months now although with Holidays and a trip for work, I did not get to enjoy it as much as I would like.
I have a potentially very stupid question (but then again I am French so what can you expect from us lot

I assumed that, since I have RTF on my X5, there would be no spare wheel so I never looked for one.
However, I found that there is a spare wheel compartment on my X5 and it has a spare wheel in it.
My X5 edition has 20" rims (315/35 front and 275/35 back) the spare wheel is a 235/65R17.
The overall diameter is similar for both, in case of issue, can I use this ? or it is one for EBAY ?
Only reason I ask is that I have been considering going non RTF as the ride is a little firm and since I have the spare wheel.. well....