Originally Posted by
Plainsman
Why the extra reach? Guessing you're tall?
My only concern is the length of the extension, it's quite a bit of a change.
On the bright side, you can decrease the extension if necessary by installing at a greater or lesser than 0 degree rise.
Folding. Probably shouldn't interfere with folding. I installed a fixed stem of about 30-40mm on a Dahon and it didn't interfere at all.
Your mileage may vary.
Also, the handling shouldn't change in a negative way. Stem length does not significantly change the handling or stability of your ride.