bagirafutar said:
On the TSDZ2 I regularly reach the motor's max. cadence, when I loose all support from the motor. It is very annoying, because with my current gearing, my max. speed is around 34-35 km/h, after this the motor cuts off. The Bosch has much more flexibility in this concern, as I can spin the cranks faster, and still get help from the motor.
From my limited 50 or so miles of testing a freshly built TSDZ2 conversion on a '99 Trek 6000 hardtail 26" mountain bike, it works best with a fairly tall gear, and around 60 cadence. My brother's bike originally had a 42-xx-yy triple and a 11-30 8-speed rear. I installed it with the default 42T, and found my self almost always in the 42:11 top gear, which is doing 28mph/45km at 90 cadence where the TSDZ2 kicks out. It seemed to give me the best torque feel on the flats in PAS 3, at around 60 cadence, I was pedalling lightly going 20+ MPH on a 26" mountain bike. going up the hill I live on thats +100m in about 1km, and has stretches of 6-8%, I was maintaining 10-15 MPH (16-24 km/h) pedalling lightly around a 60 cadence with a 42:15 or 42:17 gear (6th or 5th gear, where 8th is high) at PAS 3. PAS 4 doesn't seem to put out any more power, but its more sensitive to your pedal torque, so the power comes on stronger when you're pedalling lightly.
My next build is a 700c hybrid, it has a 13-26 8-speed freewheel, and I'm thinking of using a 52T front ring. I'm currently running a 46-36-26 on that bike. 52:13 is 4:1 while 42:11 is 3.8:1... my hybrid with 700x32 is much lighter and naturally goes faster than my brothers 26" mountain bike with its 1.95" wide knobbies.
instead of the typical 13s 5p Shark packs, I am going to get a 13s 3p 3000mAH pack, 48V 9AH, 432 WH, to save weight. I think that will give me a 40-50 mile range of riding fast but light.