I've fitted Tannus tyres to my Brompton. Fitting them is probably worth a thread of its own, but suffice to say it's doable at home but very difficult - and I consider myself a fairly competent home mechanic. I've done 10 miles on them and my initial impressions are that they're absolutely horrible and very close to being dangerous. There are 3 issues: The drag. It's not quite as bad as riding through sand, but it's very noticeable. I need to be in at least a gear lower (on a 6 speed) if I want to put the same effort in. Obviously this means a slower speed, which I could live with, but the feel of the tyre is horrible. Cornering. Taking a corner at anything over 10mph is a nightmare. The tyres feel as if they're trying to squirm off the rim. I'm an experienced cyclist and managed to control the bike, but I really think someone with little experience or poor bike handling skills would have been off. They track horribly along any road defects - the edges of filled in trenches, manhole covers etc. On the positive side they were OK on a straight hard-packed gravel track and I didn't get any punctures I've read reviews that say they get better after a few miles, so I'll give them a hundred miles or so and report back. (TLDR - they're a nightmare to fit and ride horribly, but may improve over time - I'll update in due course).