Most folding bikes come with 8 -10 speeds gearing ( Road bikes start with 10 speeds) and having so many speeds give owners a better chance of finding a sweet spot for the most efficient gearing ( especially when you have 2 chain rings in front).
We have been working with EDCO and Shimano Distributors, we have been testing how well they work on 11 speed cassettes and THEY DO! SO those with 18 /20 speeds, you CAN upgrade to 22 speeds. And for those 8-10 speeds, step up to 11!
So we have nominated the more popular models to start with. And for Road bikers with 10 speed Shimano/Campy, its a simple process.
One would ask – is it worth it? https://blog.performancebike.com/2013/10/25/our-take-10-speed-vs-11-speed/
Answer: That all depends. In my experience, I love having the extra 11th gear. And yes, I definitely do notice that it’s not there when I switch back to a 10-speed bike. The biggest benefits to me are 1) shifting is smoother and more progressive, since there are fewer big jumps in cog size; and 2) I don’t have to swap between two different cassettes anymore (one for the usual riding, one for climbing). With an 11-speed 11-27 cassette, I basically still have my beloved 11-25 gearing, but with a 27t or 29t cog tacked on the top that makes it perfect for climbing as well. 11-speed cassettes also offer a bigger range of gearing options that make it easier to find that comfortable cadence in any variety of conditions, whereas when I switch back to a 10-speed bike, I sometimes struggle to find the right gear.