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Old 04-25-14, 10:23 AM   #1
mrshinsa
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specialized hotrock 20 rear wheel issue

Just picked up a used hotrock 20 on craigslist.
Specialized Bicycle Components

Everything looks good, except the rear wheel. When I try to to spin it by hand, it slows down within 3~4 seconds.

Is this inherent issue with kids bikes with coaster brakes?
Would overhauling the hubs, or replacing the bearings help?
How difficult is it to service?
I've replaced bearings on Shimano LX hubs before, but I'm under the assumption that these kids bikes aren't as easy to overhaul.
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Old 04-25-14, 02:09 PM   #2
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Yes, it's inherent with coaster brakes, and varies by brake and brake design. However it's hard to know if yours is better or worse than average. If you're used to overhauling hubs it won't hurt to do so, but you may not get radical improvement.

Unloaded hub drag is often asked about here, and the reality is that it's a non-issue in the real world because you're looking at a small bit of friction which is negligible compared the the forces when riding the bike.
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Old 04-25-14, 03:19 PM   #3
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Sturmey Archer is advertising a better than average coaster brake hub , currently .. 'for adults'..

The one used in that bike is probably well below premium .. I'd Guess
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Old 04-28-14, 11:38 AM   #4
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Quote:
Originally Posted by FBinNY View Post
Yes, it's inherent with coaster brakes, and varies by brake and brake design. However it's hard to know if yours is better or worse than average. If you're used to overhauling hubs it won't hurt to do so, but you may not get radical improvement.

Unloaded hub drag is often asked about here, and the reality is that it's a non-issue in the real world because you're looking at a small bit of friction which is negligible compared the the forces when riding the bike.
Thanks for the quick reply.

I guess I'll abandon the idea of overhauling the hub and perhaps upgrading instead.
I've started a new thread about upgrading here:
Upgrading Specialized Hotrock 20 coaster
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