Cassette / Freewheel Issue - Need Helps Please
My brother gave me 2 good old rims, front and rear. The only missing is the gear (cassette/freewheel) Please look at the pictures. I have few questions:
1. Why the Hub having 2 threads (inner and outter)
2. The Hub length is about 3 cm or 1 3/16 inches - What cassette-speed I need?
3. The cassette is fixed cogs or loose cogs? Can I buy a 9-speed cassette then un-assemble cogs to put on the HUB one by one until it filled up?
4. Can I replace a freewheel on this?
Thank you for your advices.
Danny