Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take part in the June Giveaway for a Foldylock Pride bike lock by Seatylock


CB Hub Too Loose? Too Tight? Stripped?
#1
Hey, folks. I'm new to the forums, and new to coaster-brake hubs. Two of them in our shop are experiencing problems. When I grip the brake bar and try to turn the sprocket, it will turn and kinda click as I turn, and it does it in both directions, which tells me the drive chain won't really engage the wheel when you pedal, and the brake probably doesn't work either. That sprocket will also wiggle just a bit. So I'm thinking maybe the hub's too loose. But when I'm gripping the brake bar to hold the axle still, the wheel turns maybe one or two rotations and stops, and you can feel the bearings grinding a bit, like the hub is too tight. I can't test-ride it, but on the other ones we have like these, that sprocket doesn't wiggle (these are basically kids' novelty bikes, called banana peels.)

I've been watching videos and whatnot for them for a week with no success. I've taken one of the two that I'm having problems with apart entirely, which was helpful for me, but I'm stuck as far as actually diagnosing this problem. Any ideas?

PS, on the one I took apart, I'm not seeing any real wear, pits, etc. These are all new, but they were assembled by...folks who aren't bike mechanics, I guess. So it may have been wrong from the beginning.
  Reply
#2
You say the sprocket is "loose". If it moves side to side in conjunction with the axle, it could be loose bearings. But I'm more suspecting that the sprocket is loose where it attaches to the hub itself. In which case, completely unrelated to whether the bearings are loose or tight. Sprockets on coasters are usually held on with a snap ring. I've seen them put together with snap rings that were clearly the wrong size so they were barely locked on to the hub at all. I'd take a look at that.

For bearing adjustment, I like to clamp the axle in a vise and feel at the rim for side to side play. That's the most sensitive way to feel if the bearings are too lose.
  Reply


Possibly Related Threads...
Thread
Author
Replies
Views
Last Post
 
15,263
06-06-2015, 06:53 PM
Last Post: garrett01
 
11,842
05-06-2015, 01:38 AM
Last Post: eastman
 
63,969
01-05-2015, 07:17 AM
Last Post: slythgoe
 
10,924
10-22-2013, 12:26 PM
Last Post: nfmisso
 
3,893
04-02-2013, 02:55 PM
Last Post: RBurrelli
 
5,116
06-14-2012, 09:43 PM
Last Post: FredS

Forum Jump:

[-]
10 Latest Posts
Star blubike lube
Today 02:02 PM
CHANGING 1x8 into 2x8
Today 01:38 PM
Creaking/clicking when putting heavy loa...
Today 08:25 AM
Tubeless users: do you still carry a fla...
Today 12:16 AM
How to keep your bicycle safe?
Yesterday 02:25 PM
It's here! Biking Down a Volcano at 58mp...
Yesterday 12:22 AM
Hello!
06-15-2021 02:21 PM
Looking to get my first proper bike, I'm...
06-15-2021 12:45 PM
Requesting ID/worth for Bianchi
06-15-2021 04:51 AM
One expensive lock vs two cheaper locks?
06-15-2021 03:23 AM

[-]
Top 5 Posters This Month
no avatar 1. ReapThaWhirlwind
54 posts
no avatar 2. Jesper
20 posts
no avatar 3. JoJoJo
10 posts
no avatar 4. Zviedrs
10 posts
no avatar 5. ChaseCal
7 posts