Wayne asked about Trials bicycles. I am not aware of them either but can
only think that some other popular bicycle sports such as Polo or 'Trackers'
used these small rings. The 'tracker' was a bike built or more likely
modified for racing around urban bombsites after the Second World War. I had
one. It was fished out of the River Wandle by a mate at college and turned
out to be made specifically for this sport by Pearsons of South London. They
restored it for me. It had STRAIGHT forks. I have a photo of it somewhere. I
will try to find it. I do remember it had a small chainwheel and was single
speed with a freewheel. Bars were 'Comfort' bend.
Claud Butler made Polo bikes amongst others. The other UK Savants may no
more.
Mark Stevens Evanton Scotland