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Old 01-04-10, 08:09 AM   #1
norris
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Rear Wheel Replacement Help

OK, so I've read the rules for newbies and I'm going to try not to contravene any of them. Whilst I am a hugely keen bike rider, it has become abundantly clear to me in the last month or so that I don't have the first clue about bike repair or maintenance. Apologies if I break any of the rules here.

Here goes:

I buckled both my wheels in an accident a fortnight or so before Christmas. Being a student, I don't have much spare cash and I could only afford 1 replacement wheel. I bought the front one, and asked my Dad for a 7-speed rear wheel as my Christmas present. My previous rear wheel was of the 'traditional freewheel' variety, and of course the replacement I've been given is a freehub and casette dealio.

Basically my question is, if I pick up the necessary casette to go on my freehub, will this new wheel be compatible with my bike?

Please be gentle!
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Old 01-04-10, 08:59 AM   #2
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Without going into too much detail, there could be (most likely will be) a difference with the frame spacing. See Sheldon Brown's site: http://www.sheldonbrown.com/frame-spacing.html . It is possible that you could go from 126 mm to 130 mm just by "jamming" the wheel into the frame.
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Old 01-04-10, 12:42 PM   #3
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You'll also need a spacer for a 7 speed cassette on a 8/9 speed freehub, so while you're over at Sheldon's page peruse this one http://www.sheldonbrown.com/speeds.html.

The rest of the bike is okay but both wheels got trashed? Is there a good story? Hopefully with a happy ending...

A hint for posting, providing as much information as possible is a good thing (like what kind of bike, names/models of components, that sort of thing). Mindreading is hard.
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Old 01-04-10, 12:50 PM   #4
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Quote:
Originally Posted by norris View Post
OK, so I've read the rules for newbies and I'm going to try not to contravene any of them. Whilst I am a hugely keen bike rider, it has become abundantly clear to me in the last month or so that I don't have the first clue about bike repair or maintenance. Apologies if I break any of the rules here.

Here goes:

I buckled both my wheels in an accident a fortnight or so before Christmas. Being a student, I don't have much spare cash and I could only afford 1 replacement wheel. I bought the front one, and asked my Dad for a 7-speed rear wheel as my Christmas present. My previous rear wheel was of the 'traditional freewheel' variety, and of course the replacement I've been given is a freehub and casette dealio.

Basically my question is, if I pick up the necessary casette to go on my freehub, will this new wheel be compatible with my bike?

Please be gentle!
You need a 4.5mm spacer (they make those specifically for your application, a 7 sp cassette on a 8/9/10 freehub. So yes your new rear wheel will work. If your chain is at all any worn, you may encounter skipping with a new cassette in which case you will need a new chain as well.
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Old 01-04-10, 01:07 PM   #5
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Can you return the gift wheel and use the cash for the "correct" replacement?
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Old 01-04-10, 03:39 PM   #6
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Can you return the gift wheel and use the cash for the "correct" replacement?
+1
That would be the cost effective choice.
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Old 01-04-10, 08:21 PM   #7
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Especially if you have an aluminum frame, because you can't spread those to accept a wider hub.
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Old 01-04-10, 09:52 PM   #8
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Also look on Sheldon site for alternate routing of gearshift cabel to make 7 sp cog spacing work with 6 sp shifter. Then when you have more money you could buy 7sp shifters. Keep the 7 sp freehub wheel because the hub is much less susceptible to axle breakage.
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Old 01-04-10, 11:28 PM   #9
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You can find many articles related to this situation here:

http://sheldonbrown.com/gearing/index.html

Personally I'd stockpile the 7-speed parts. They are getting scarce.
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Old 01-05-10, 01:35 AM   #10
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Can you return the gift wheel and use the cash for the "correct" replacement?
+ 1 Billion. Preferably bringing the bike with you and leaving it with them until it's repaired.
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Old 01-05-10, 05:15 AM   #11
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Especially if you have an aluminum frame, because you can't spread those to accept a wider hub.
You can, just not permanently "cold set" aluminum frames.
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Old 01-05-10, 10:57 AM   #12
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Is the new one for a seven speed cassette or for an eight? A seven will have the same rear spacing as your freewheel hub.
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Old 01-05-10, 11:12 AM   #13
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You can, just not permanently "cold set" aluminum frames.
Very true. I wouldn't try to put a 135mm hub in a 126mm aluminum frame but 126 in a 130 has never given me any problems (Cannondale road frames from the late 80's in both cases).
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Old 01-05-10, 11:13 AM   #14
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Is the new one for a seven speed cassette or for an eight? A seven will have the same rear spacing as your freewheel hub.
Not necessarily. I've worked on a few MTBs from the '90s with 7 speed cassettes and 135mm rear spacing.
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Old 01-05-10, 11:14 AM   #15
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Very true. I wouldn't try to put a 135mm hub in a 126mm aluminum frame but 126 in a 130 has never given me any problems (Cannondale road frames from the late 80's in both cases).
I have not tried with an aluminum frame but respaced a steel Schwinn from 126 to 130. The hub would not stay put until I bent the dropouts inward to bear squarely on the ends of the hub, unless I used too much skewer tension, which is a recipe for ruined cones.

I am glad it worked for some people but since I follow conventional advice about how tight to run the skewer, I would say it's not me but the bike. Some bikes will be like that.

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