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myopic
Joined: 07 Jan 2009
Posts: 220
Location: Edinburgh, Scotland
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 Posted Sat Nov 7, 2009 9:18 pm |
My son's BMX (Felt Fuse 09) rear wheel has developed a very small bit of play. THe spec fo the hub is that it is an "alloy rear 4 sealed bearing cassette hub w/ 9T driver, 48H, 14 mm axle".
I thought that maybe the cones had worked loose, but when I took it to bits I discovered that it has what looks, from the ParkTools Webiste, like sealed cartridge bearings. They have the number 6902RS on the black ring on the bearing unit.
The website says that the these units cannot be adjusted but should be replaced if play develops but that is not covered on the site. I have 3 questions I hope someone can help with:
1. Where can I order new bearings?
2. Where can I find instrctions to replace these?
3. Will it do any harm to the hub to use the bike in the meantime? The play is quite smalll - maybe 1 mm each way at the rim.
Thanks for any help!
A wet day on a bike is better than a sunny one in the office |
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nicklouseLives Here
Joined: 20 Mar 2003
Posts: 48093
Location: A Yorkshire man in Sweden
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myopic
Joined: 07 Jan 2009
Posts: 220
Location: Edinburgh, Scotland
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Posted Sat Nov 7, 2009 9:29 pm |
Cheers, Nick. Is there a description anywhere about how to replace these units beside using a hammer? I can think of several ways to try and get them out, but I would like to do it right! Would it be the same as some oof the routines I've seen in mags for Hope type hubs?
A wet day on a bike is better than a sunny one in the office |
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nicklouseLives Here
Joined: 20 Mar 2003
Posts: 48093
Location: A Yorkshire man in Sweden
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myopic
Joined: 07 Jan 2009
Posts: 220
Location: Edinburgh, Scotland
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Posted Sat Nov 7, 2009 9:58 pm |
Cheers, thanks, Nick!
A wet day on a bike is better than a sunny one in the office |
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dave_hill
Joined: 16 Oct 2007
Posts: 3625
Location: Burnley, Lancs.
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Posted Sun Nov 8, 2009 12:06 pm |
When you're fitting the new bearings, use an old socket to knock them back in - it will need to sit on the outer race of the bearing so that you can hit it square on. DON'T hit the new one on the inner race - you risk it popping out.
A trick I've used in the past with motorbike wheel bearings is to put them in the freezer overnight. It makes then contract a minute amount which can make the difference between having to belt them or give them a firm tap to get them in.
Give a home to a retired Greyhound. Tia Greyhound Rescue
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Salsa
Joined: 03 Aug 2007
Posts: 316
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Posted Sun Nov 8, 2009 1:09 pm |
The Profile Mini's on my BMX have had a slight 1mm sideways play for ages (like 2 years +) with no noticeable damage. They still feel silky & spin for ages so if yours are the same you can probably leave them as they are.
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myopic
Joined: 07 Jan 2009
Posts: 220
Location: Edinburgh, Scotland
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Posted Wed Nov 11, 2009 1:01 pm |
Thanks for the tips, Dave and Salsa! Dave, I guess once they are almost exactly in place, thightening up the nuts will seat them nice and square as well? Or could you use that approach in place of the tapping in with a old socket?
Salsa, Think I will order some spares but not replace yet unless I notice a worsening.
Now for a really stupid question..... How many do I need? I'm sure its 2, but I've never done this before and don't want to discover its 4 once i have it a bits have a sullen kid glaring at me!
A wet day on a bike is better than a sunny one in the office |
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nicklouseLives Here
Joined: 20 Mar 2003
Posts: 48093
Location: A Yorkshire man in Sweden
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myopic
Joined: 07 Jan 2009
Posts: 220
Location: Edinburgh, Scotland
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Posted Wed Nov 11, 2009 1:07 pm |
Cheers, Nick
A wet day on a bike is better than a sunny one in the office |
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myopic
Joined: 07 Jan 2009
Posts: 220
Location: Edinburgh, Scotland
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Posted Wed Nov 11, 2009 1:16 pm |
Actually, had another couple fo thoughts:
Is one more likely to have gone than the other, or if you are goign to replace one is it as well to rpelace both?
What type of things might cause the bearings to go? Its only 5 months old and never been used in wet, muddy or dusty conditions.
Could having the chain too tight be a problem? He tightened it up a few weeks back because it was slapping a bit on the chainstays. If a tight chain is the problem, can anyone advise on correct chain tension? Thanks!
A wet day on a bike is better than a sunny one in the office |
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nicklouseLives Here
Joined: 20 Mar 2003
Posts: 48093
Location: A Yorkshire man in Sweden
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myopic
Joined: 07 Jan 2009
Posts: 220
Location: Edinburgh, Scotland
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Posted Wed Nov 11, 2009 1:24 pm |
Thanks, again, Nick!
A wet day on a bike is better than a sunny one in the office |
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