[QUOTE=Wisper Bikes;183439
A lot of useful information, David, thank you.
On shorter journeys - up to about 15 miles (on the road), I would normally choose the Grace Easy, especially for the city. The BionX system is sophisticated, silent and powerful, I find it great at the lights for accelerating quickly with the traffic. However using the bike on full power for hill climbing does drain the power quite quickly especially if you are on the heavy side. This may be due to the 48A motor but you do have to be careful. There are four regen modes, four power modes and a cycle mode. As the bike weighs under 19KG and there is no noticeable drag in the cycle mode the bike can easily be ridden with no power, however I normally use it on setting 1 of 4 as this makes the bike practically weightless. The regen is useful for very steep hills as setting 4 really does take the heat out of the hill and effectively puts charge back into the battery. I use the regen carefully though, as I have discovered that it is better to keep the kinetic energy stored in the bike and rider, and use it for keeping momentum after a slight to medium decline. This is a far more efficient use of the stored power than recharging the bike. If you are super fit and are riding for exercise, the regen modes add resistance in the same way an exercise bike does in the gym. IMO, this style of bike is for the fitter electric bike enthusiast who likes a nimble ride.
I ride for exercise and pleasure but am by no means super-fit! My normal ride is a maximum of around 20 miles at present, although I'm hoping to increase this as the summer (wishful thinking?) goes on. Mainly fairly level on a mix of backroads and tracks with a few short but steep hills. I like the spec of the Grace Easy, especially the belt drive, but have reservations about the three gear hub - a hark back the Sturmey-Archer days of long-forgotten youth perhaps?
The Bosch crank driven Grace MX is great for off road and trail riding, however it is most important that I keep my cadence high especially on steep hills or the bike will stall. The lowest gears are good for hill climbing and you do get a huge number of assistance settings, 12 in all and none of them regen. Range is good on crank drive bikes considering the battery size due to the efficiency of the motor driving through the gears. The motor is quite but it can be heard. I find the crank drive system asks for reasonable effort from the rider to get the optimum performance out of the bike.
I've tried a crank drive, hub geared bike and decided it wasn't for me.
For longer journeys, especially in the hills, I would choose the Wisper which has a less sophisticated geared hub drive. The range is far better than both of the above bikes but that is down to the 600Wh battery. I can choose exactly how much effort I want to expend at any time but simply twisting the throttle. Occasionally I do have a rest and go throttle only. The motor is not as quiet as either of the above bikes, you can hear it coming in especially under high load. The torque is higher than the others and I find hill climbing more comfortable. The bike and motor as a whole is not as sophisticated as the BionX or Bosch though that is reflected in the near £1500 price difference!
I'm considering Wisper, more for a replacement for my wife's bike, and mean to look into that soon. I could be tempted myself in view of the bike's spec.
There's not a lot of scope for trying out a range of bikes where I live (N/East Fife) without a good bit of travel, however I mean to sort something out.
Thanks again for the info and advice. (As you can see I haven't yet mastered the art of replying to quotes in this forum - apologies if it's a bit disjointed.
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Jim