Thanks, for your reply. I used a
http://heidenautires.com/motorcycle-sidecar-tires/ K37. Square profile, very large sidewall, suited more to the ural 3 wheel outfit. This was a 400/19, fitted to the rear of the enfield. A few problems to make it fit & not perfect, for the width of the swing arm and height of the rear fender.
The bike did roll real nice on the road, always got the feeling that the rear of the bike was always pushing the front of the bike, a higher side wall tyre on the 19 inch front wheel or a 21 inch front wheel would maybe have corrected this ????????? Maybe.
I rode a mountain fire road/track which was rough, with a lot of channels dug across every hundred feet, to stop washout. The 19 front wheel with a heidenau k60 fitted, fell into every channel, a real pain. The larger side wall tyre to the rear just rolled over it, with out any problems. The rear of the bike felt like a steam roller, just took on the rough terrain with ease, with the tall tyre.
The hard compound of the german tyre, is a little vague, on our, cold / damp / wet roads. I can see where there is a problem with these tyres on a larger heavy bike, being pushed into the corners ect.
I will try one of the Ensign Trials to the rear, very soon, will be interesting to how it feels when the bike is loaded with luggage. I hope it will suit my needs, because running 2 wheels the same size and 2 tyres the same, makes for bringing, only one spare tube when the bike is on the road for longer trips. Tyre choice is so easy and simple with modern bikes, not so easy with our old school enfields, as always the search goes on to improve a old design, in our modern world. Keep Smiling & Keep The Wheels Rolling.

