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My experience with the SA S2C

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My experience with the SA S2C

Old 09-12-15, 10:38 AM
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colinm
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My experience with the SA S2C

Hi!

I bought an S2C hub built into a wheel off of CL from an English bike enthusiast. While it did work, the braking action was lumpy and play in the hub was considerable.

I decided to disassemble it to add grease, reduce play, and inspect for the infamous support ring mod. See here for details:

Sturmey Archer S2C duomatic hub review ? Dave McCraw

After initial disassembly, I did not find the ring. Upon adjustment and reinstallation, however, I managed to mangle the pawl spring. I ordered the support ring and a new spring from SJS Cycles in the UK. Total delivered cost, $12.

Once received, I reassembled the hub again. As it turns out, my hub must be post-mod production as the ring would not allow proper assembly, and I do have sharp edges on the fittings between the brake actuator and the pawl assembly. I suppose the ring is only for those hubs that were manufactured incorrectly, and is not necessary on properly made hubs. I'm not certain, but there was no way I could assemble the ring into my mechanism. The new pawl spring worked perfectly.

I need the proper spanner to adjust the left-side bearing just right, so the play I originally set out to remove remains. I do understand that coaster brake hubs do have play in them by nature, but I think it can be better. I'll keep trying.

After liberal application of the proper grease, braking action is now as it should be, smooth and easily modulated. Shifting is as before, predictable and confident. I was worried that packing the hub with too much grease would impede the shifting action. I would say that the hub is not "packed", but rather is liberally coated, with special attention given to bearings and the brake-end.
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Old 09-12-15, 08:37 PM
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Velocivixen
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@colinm - Thanks! Nice photos too. I haven't worked on one of those, and the link you had went into some nice detail. Makes me wanna take something apart.
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