Cheers. I've spent 2 hours cleaning the spare rear rim but now I'm concerned it's too wide! Measures 2.5 inches inside to inside. And has a deep squared well. Tubliss kit says 1.85-2.15. Think I'll check the stock wheel and see what that is before I decide which wheel gets what tyre.
Anyway I got some amalgamating tape from the bay of E coming for the front wheel. I have the proper stuff for the rear.