Have fitted a pair to cyclotricity revolver. Very reassuring. Definitely a harder ride. Fitting requires a bit of muscle, but is perfectly doable. Main problem on my rear wheel is that the internal rim width is beyond the scope of Tannus supplied plastic pins. So I had to make 36 custom size. So its been two weeks and so far so good.... Pricey at £59 each (26" wheels), but having had multiple punctures and replaced tyres, tubes, fitted liners etc I have prob almost spent the same amount already, only to still get flats.! Great idea from Tannus.