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Old 12-04-21, 10:13 AM
  #25435  
gster
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Location: Toronto
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Bikes: 1971 Hercules, 1978 Raleigh Superbe, 1978 Raleigh Tourist, 1964 Glider 3 Speed, 1967 Raleigh Sprite 5 Speed, 1968 Hercules AMF 3 Speed, 1972 Raleigh Superbe, 1976 Raleigh Superbe, 1957 Flying Pigeon, 1967 Dunelt 3 Speed

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Originally Posted by dirtman View Post
I've had a few broken axles and stripped pinion gears but I've not seen one locked up or twisted like that. All of the hubs that had broken axles that I found were badly abused and run till they just wouldn't go any further. The few stripped pinions were in hubs that were badly worn internally, likely run dry for years.
I could imagine what sort of havoc a loose or protruding pin could do when moving along at speed, especially with a heavier rider

As a kid, I broke an axle on a road bike and the rear end locked up while descending a hill, it wasn't a fun experience

I would suppose with a three speed hub, if something broke or locked up at speed, the forces could be amplified even greater than with a straight axle. If the driver locked up, the effect would be simply a fixed gear situation, but if you lost a set of pawls combined with a loose pin or some shrapnel in the mix, the planetary gears could exert some serious force on the axle as various components stopped turning. I wonder if the planetary gears could create a reverse gear situation if one set of pawls were either engaged or not there in the right combination.
Either way I can imagine the crunching and grinding sounds that had to make as it locked up.
Years ago, I gave an old 3 speed to a young friend. A 1969 CCM Galaxie. I didn't know much about SA hubs at the time and thought he could figure it out.
He complained that it just wouldn't shift so I took it back and swapped him another bike (5 speed deraileur).
Eventually I got around to taking the hub apart to have a look.
The pin was loose and half way out and the axle was quite badly warped.
In any case, the hub was fixed and they bike found a new home.
I might add that the person i originally got the bike from was also quite heavy.....
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