Pacific Cycles

Above is manufacturer's site. Unfortunately, to go to the store, it is in chinese. You can find also Birdy parts on Ebay. The rear suspension is available, not cheap though. Finally, I thought I saw a recent post here where a new Birdy distributor was setting up shop in NYC (?).

www.bikeforums.net/folding-bikes/473415-birdy-thread-35.html

Post #868