Mark_A_W wrote:I've never seen a bike with 6 speeds. All mountain bikes since forever have been 7 to 9 on the rear.
There are literally millions of 6 speed freewheel equipped bikes around. I have two, both reasonably recent. The commonest freewheel used is the cheap Shimano MF-TZ30 - Google it, you'll get loads of hits.
The popularity of six speed comes from the budget bike market, all those tens of millions of cheap bikes sold in the Far East etc. Many just have 6 gears.
On an ebike I'd say that you don't need a lot of gears, or really any of the very low ratio gears, as you have the motor to help out. My electric folder stays in top gear most of the time and I don't think I've ever used the 28t gear.