If you remove the rear wheel ti change a flat you have to re-tension the belt or else it starts to skip. I could never figure out how to do this without the special tool (who wants to carry that) so it was $20 at the LBS. I lived in fear of flats.
Note use of the past tense as I don't ride the bike anymore...was going to sell it but the the belt drive developed a creaK...or maybe it is the ugh, butbthe two are joined at the hipk...back at the shop fir warranty service again.
Never again