>>1094553>I'm thinking of getting one for commuting, but the 20' tires (with a 52x14 lowest chain combo) worry me a bit in terms of speed.
Folding bikes are geared different to accommodate the small wheel size (note the larger chainring) and the smaller wheels actually make for a much more nibble and agile ride. That said, they're geared for city riding (lots of starts and stops) so they'll generally be geared lower than a traditional dropbar road bike.>Calculations say I'm gonna be needing 90rpm+
Anything below 85RPM isn't very efficient anyway. Spin to win!>What are some pros/cons that you've noticed?
The biggest pro would be portability, and like I said above, they're super nimble and fun. As for cons; While there are more tire options today than a few years ago, you'll most likely need to special order them, which can really suck in a pinch. The folding pivots are also prone to develop play over time, which is less of a safety thing and more of a noise issue, but still. Lastly, the bikes generally have rider weight limits which can be limiting if you're heavier.
If you're thinking of getting a folder for city commuting, they'e designed for it and can be a lot of fun!