Old 11-11-16, 04:56 PM
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I haven't torn down that many coaster brake hubs. But I can tell they're not all created equal. Nor are they all lubed equally either.
The older, presumably higher quality units have a circlip that pull the brake shoes inwards, out of engagement. These tend to have - at most - a very marginal extra drag compared to other hubs.
But I've also seen a few newer/cheaper hubs w/o that circlip. In these, the brake shoes stay in engagement - but not under pressure - even when coasting, resulting in noticeable drag.
Then there are the lubes. Some of the cheaper hubs have had very sticky lube, almost tar-like.
If you add sticky lube AND the lack of a disengagement mechanism, then you do get something quite obviously draggy.
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