Just thought I'd let anyone who might be wondering whether to switch to balloon tyres how pleased I am with the Fat Franks on my Wisper 705. Previously it was a real effort to cycle without the motor, not very enjoyable. With the Fat Franks I find that I'm happily cycling under my own steam most of the time (admittedly not very fast but I'm not a speed merchant). The only drawback is that I've had to remove the rear mudguard but I've decided that's an acceptable trade -off. I took a while to make the switch but I'm really glad I did