eBay


TSDZ2 Torque Sensor Central Motor. Power: 500W. Voltage:48V. No Throttle. No Brake Grid.

PS:  39 usd extra payment needed if you need throttle and cutoff brake.

Feature:

1. Easy assembling;
2. Maximum Torque: 80N.M;
3. Built-in Controller and both side torque sensor;
4. Weight: 3.6Kg;
5. LCD Display.
6. Power: 500W;
7. Power Assistant Ratio: 36%~300%;
8. Limited Speed: 25Km/h;
9. Chainwheel: 42T;
10. High efficiency, low battery power consumption, safety long riding.
11.BB SIZE:68mm-73mm

It fits all 48V battery packs.

TSDZ2  Central Mid Motor With Torque Sensor,48V 500W 42T Conversion Ebike Kit
Advantages:
1.Easy installation,aplicable for most normal bicycles
2.Most powerful about 80N.m,strong ramp-climbing capability
3.Internal controller+axial torqure sensor(real two-side torqure)
4.Compact size and elegant shaape,weigh about 3.4kg
5.Comfort ride,high efficiency,low battery consumption and longer range
6.Safe,reliable and excellent performance
Main parameter:
Max.power:500W,Max.torque:80N.m,Power assist ratio:36%-300%,Speed limited:25km/h, Rated voltage:36v/24v/48v
Installation Step:
1.Push motor BB axle into BB tube,the exxposed axle length on left side is 11mm(Put securing plate onto BB axle, Put 2 washers between motor and securing plate,Tighten the securing plate and the motor with two m5*6 screws)
2.Screw the M33.5 nut onto the BB axle,do not tighten the nut
3.Install the fixing block onto the motor with m8*40 bolt, do not tighten,Using a m8*45 bolt and the hang-plate to tighten the fixing block and motor
4.Tighten the bolt with 40nm torque force,tighten with affiliated wrench by over 40n.m torqure
5.Using m8*14 bolts to install the arm-cranks.the locking torque is over 40n.m
 
HOW DO I KNOW IF THE MID DRIVE CONVERSION KITS WILL FIT MY BIKE?
The Mid Drive Kits are designed to fit bikes with a 68mm (2.68 in.) or 73mm (2.87 in.) wide bottom bracket shell and 35mm inside diameter.  This encompasses the vast majority of bikes excluding some newer high end bikes with an Integrated Bottom Bracket.