I've put new tires (Heidenau K60's) on my Enfield and am loving the resukt.
The off road grip is great.
One technical question though: After riding for a while, espcially during heavier off road use, gear changes (especially shifting back down the gears) gets really hard. At times it is even easer to reach down with my hand and pull the shift lever up because it just takes too much strength to do it with my toes.
Gearbox oil is new and up to the right level and I greased it. Any suggestions?