If you are mostly riding on tarmac I wouldn't bother with those tyres mate. They don't grip too well on the road and feel a bit unstable. They look the part, but I am actually thinking of putting some more tarmac biased tyres onto it. These are them if you are fussed -
http://accessories.hitch*******smotorcycles.com/accessory-shop/Ensign-Universal-Trials-Tyres/17352
Mine is a Watsonian special model - An Enfield EFI Trials - so came standard with those tyres, the alloy mudguards, sump guard, handlbars, and high level exhaust, the latter since replaced with a very noisy Hitchcocks stainless job.