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I didn't think you needed details, just identification, but from memory here goes.
Rigid axles 1/2 inch in dia.
Swinging-arm axles 5/8 inch in dia.
First swinging-arm frames introduced in 1949
Up until 1949 the axle was the inner race for the wheel bearings.
Up to 1950, 6 bolts hold on the sprocket cum brake drum.
1950 to 1954, 5 bolts hold on the sprocket cum brake drum.
1950 can be either 5 or 6 bolt.
Full width hub introduced in 1955.
Please note that we are talking about rear hubs only here.
If you want me to check my facts please ask, but I am pretty sure they're right. In my younger days I raced these bikes a lot.
Rigid axles 1/2 inch in dia.
Swinging-arm axles 5/8 inch in dia.
First swinging-arm frames introduced in 1949
Up until 1949 the axle was the inner race for the wheel bearings.
Up to 1950, 6 bolts hold on the sprocket cum brake drum.
1950 to 1954, 5 bolts hold on the sprocket cum brake drum.
1950 can be either 5 or 6 bolt.
Full width hub introduced in 1955.
Please note that we are talking about rear hubs only here.
If you want me to check my facts please ask, but I am pretty sure they're right. In my younger days I raced these bikes a lot.
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