I stripped down these motors to compare the differences. They're both 201 rpm versions..
The cores with their side-plate can be exchanged between the hubs.
The main difference is the width of the core. The Q100C is much narrower, which must affect the power and torque. They're the same diameter. The photo below is a bit misleading because of the wide-angle lens:
The axles are different. You can see the width better in this photo:
The clutches are different and the bearing has a larger diameter. Those with good ideas will notice a slightly different gear tooth form and the different number of teeth. The Q100C has 75/24 and the Q100 78/33:
Here's the cassette spline that can be removed without dismantling the motor. It's held in place by a nut on the axle. It's quite stiff to slide on the axle:
The clutch and side-plate:
The Q100 clutch and side-plate:
The cores with their side-plate can be exchanged between the hubs.
The main difference is the width of the core. The Q100C is much narrower, which must affect the power and torque. They're the same diameter. The photo below is a bit misleading because of the wide-angle lens:
The axles are different. You can see the width better in this photo:
The clutches are different and the bearing has a larger diameter. Those with good ideas will notice a slightly different gear tooth form and the different number of teeth. The Q100C has 75/24 and the Q100 78/33:
Here's the cassette spline that can be removed without dismantling the motor. It's held in place by a nut on the axle. It's quite stiff to slide on the axle:
The clutch and side-plate:
The Q100 clutch and side-plate: