I have a pair of weinmann symmetric brakes (Raleigh Super Tourer), which I too think are an exact copy of the Altenberger / GB Synchron brakes. Mine seem to work fine, although the bike has been out of service for a while since I broke the rear axle. It would be good to know :
- was the idea of a dual pivot patented? - why did they take such a long time to catch on ? - why were the first 3 instances of dual pivots so very very similar ? - was the Raleigh Super Tourer (1974) the first production bike to use them ?
- Don Gillies
San Diego, CA, USA