Nano Races aren't TLR but they will seal on T-R rims ime. The TCS tyres are just much easier to set up - they'll seat dry on Shimano UST rims whereas the Races needed sealant, the bead edges have those tiny mold lines. The Races aren't paper thin, a lot of local Chilterns use on a set over the last year or more and only one flint cut to date. The TCSs haven't been used that much yet.

Perfect, thanks James