El Zorro said "Biker, since you have the exact model he is looking for (T100), how do they ride? Are they reasonable good highway drivers? His current Ural doesn't go much above 50 mph."
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For me they give a classic ride in a classical riding position which is why I bought it, Some people like to mess around with the front suspension, rear shock breakers or chain sprocket ratios but I like it fine just as it is. Some people change the T100 seats for the Scrambler seat but again I like it the way it is.
There are probably better highway bikes if you're looking for coast to coast travel (if it were me I'd look at a BMW F 800 or R 1200 for example) but that's not the reason to buy a Bonneville T100.
I like the Bonneville T100 as a really nice jump on and ride, responsive, feel good factor bike - not a modern sports bike, not a conventional street bike and not a cruiser. There are other much faster bikes including the Triumph range but 80mph plus or whatever you want in reason comes up plenty fast enough for me.
Somewhere there's a way to find out if each bike is made in the UK or Malaysia. I suspect mine is made in Malaysia but never bothered to find out as for me it's not an important factor. The engines in the Bonneville and Scrambler are similar but the Bonneville is a 360 deg crank and the Scrambler is a 270 deg crank.
The Kawasaki VN900 is used for when Mrs. BikerEm and I want to go out together but for a solo ride I usually chose the T100. The bike is in its element on back roads. Some people use the T100 two up but we think it's too cosy for two full grown adults. A couple of teenagers or parent and child are fine but otherwise we think it's a tad too cozy.
The Triumph that I saw with a sidecar was the earlier generation three cylinder Thunderbird which is a bike I regret not buying when I had a chance a few years ago (sans sidecar). The new Thunderbird is a very different beast. I think the Bonneville would be physically a bit small for a sidecar although it would not surprise me if it's been done already