Out of all of the 70's trail bike ranges it's the 175/185 versions that work best as trail bikes. They weigh little more than a 125 but have much more stonk so are more fun. All of the trail bikes don't do more than 70 on the road so really you are looking at cruising at 50mph. Even the toddler 100cc versions can do that but they are tiny and you need to be a small rider, but they go faster than you would think. Probably my favourite is the Suzuki TS185 with it's twin shocks. The TS250 (the Savage) is also really good, but heavier, so less fun on green lanes. The build quality of these early japanese bikes was poor. Crap welding and they rust well. Parts are really expensive and are getting very hard to find, so that limits the mileage you can put on it. The smallest one I have ridden was the DT50 and that was the slowest bike I've ever tried and really tiny. The 400cc versions are a waste of time, they add nothing to the experience. From time to time I look at TS250/185 imports and think about getting one but it's a rose tinted view. With all the green lane restrictions these days I'm giving up on trail bikes and my attention is pointing more towards an electric mountain bike to ride the byways. There are so many more routes to ride them in the UK. As a road only bike these old stroker trail bikes are good for local journeys in the summer on back roads. To be honest, an old RE350 with knobbly tyres could do more these days...but with a different soundtrack.