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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 09-28-04, 12:58 PM   #1
karl210
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wont pedal ?

today i was doin a few miles on my mountain bike and i was just goin up a 1 degree hill at about 10 mph in a normal gear nothin to high or nothin to low and there was a snap. i stopped and i thought the chain snaped so i felt for it and it was still there so i got off and i could spin the pedals forwards and backwards without turning the wheel the cassete will just spin instead of catching and going. do any of you know what i have broke any help will be greatful thanks
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Old 09-28-04, 01:35 PM   #2
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Sounds like to me your broke the freewheel assembly in the rear hub. You should be able to freewheel (spin the cranks "backwards") but obviously you shouldn't be able to spin the pedals "forwards" without the rear wheel moving. Inside the rear hub, there would have to be pins (for lack of a technical term) that catches on the gears when you pedal forward which perhaps have broken off so now you can freewheel in both directions.
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Old 09-28-04, 01:38 PM   #3
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Originally Posted by Jay H
Sounds like to me your broke the freewheel assembly in the rear hub. You should be able to freewheel (spin the cranks "backwards") but obviously you shouldn't be able to spin the pedals "forwards" without the rear wheel moving. Inside the rear hub, there would have to be pins (for lack of a technical term) that catches on the gears when you pedal forward which perhaps have broken off so now you can freewheel in both directions.
I think they are called 'pawls'?
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Old 09-28-04, 01:42 PM   #4
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yeah that sounds about right thanks but can i just go to my local store and buy or order these things eisily and im guessin that they are not too much or do i have to but a full new thing or something
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Old 09-28-04, 01:47 PM   #5
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yeah that sounds about right thanks but can i just go to my local store and buy or order these things eisily and im guessin that they are not too much or do i have to but a full new thing or something
Take the wheel off and to a LBS. They will inspect- perhaps they can fix. Probably not a novice job.
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Old 09-28-04, 01:48 PM   #6
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are you trying to say something lol as soon as i fix something, something else breaks aaahhhh
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Old 09-28-04, 01:52 PM   #7
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A good Mech is a friend indeed. Some jobs I let the pros do, like lacing wheels- rebuilding a hub ya. I don't think I would know a 'pawl' looked like even if it crawled up my leg and bit me.
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Old 09-28-04, 01:59 PM   #8
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Yes, "Pawls" is the term I was looking for...

If you want to know what they sort of look like, I remember when I was biking to Maine from NJ, my friend and I biked right up Rt 1 for a bit near Searsport, just north of Belfast, ME and stopped by the Penobscot Marine Museum. They have a giant freewheel (basically) on the outside of their lawn which is used on large schooners or full-masted ships to raise the anchor and stuff. Basically it is a large round cog with triangle shaped teeth, which the pawls catch when the cog is rotated the right way. However, when the cog is reversed, the pawls simply ride the teeth and then drop down into the next tooth but don't catch. (Which is why some freewheels are loud (such as the Hugi 240)) If these pawls are broken or misaligned, etc, then you will be able to spin in both directions. It's kind of odd that all of them would be broken so my layman's guess is that the internals of your hub is out of whack but yeah, they could break...

Jay
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Old 09-28-04, 02:06 PM   #9
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thanks for the help guys ouch my leg is hurtin i whacked it on the frame lol
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Old 09-28-04, 02:16 PM   #10
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Just to add to this...
To fix this you need to replace the "cassette freehub body" which will involve pulling off the cassette, pulling the axle out, pulling the driveside bearings, dust seal. The freehub body comes off the hub by removing a large bolt with a 10mm allen, or so, and then replacing with a new freehub body and then overhauling the hub while your at it with new bearings and grease. Whew.....yep, it's a job for shop. I usually charge somewhere in the neighborhood of $50 or so. You can usually just pick up a whole new wheel for that price.
Now if your lucky you just have an older 6-7 spd wheel with just a freewheel. This is different than a freeub. A feewheel has the cogs and the freehub mechanism all in one piece. They thread on to the hub. This would be easier to fix and cheaper, definately a novice job with a freewheel remover.....
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Old 09-28-04, 02:22 PM   #11
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Also, check this link out...
http://www.parktool.com/repair_help/..._freehub.shtml
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Old 09-28-04, 02:23 PM   #12
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Is there any quick fix in his case when ur on the road?
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Old 09-28-04, 02:28 PM   #13
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Ususally no, but I did forget to mention that sometimes the "pawls" just get stuck in the open position and that will cause the freehub to not engage. This can be fixed by having the freewheel or cassette freehub body flushed out with lub and reinstalled. It's just regular maint. that should be done in a yearly tune-up. All this needs to be done with multiple tools in a shop. If this happens to you on the road just walk to your nearest pub and get your drink on.......
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Old 09-28-04, 02:29 PM   #14
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wow that looks like a big job i think ill take it into the shop and get it fixed thanks oohh damn i was savin up for things for it aswell
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Old 09-28-04, 02:31 PM   #15
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hey namasate 1978 could i do that by myself or is it a job where profesionals are needed
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Old 09-28-04, 02:36 PM   #16
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Yep, good idea. On a second note, when you go to your shop ask them about repair classes. If you can learn to overhual a hub, it will give you the basic skills to be able to work on headsets and bottom brackets.
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Old 09-28-04, 02:47 PM   #17
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Well I don't know if you can do it yourself or not!!! Take a look at that link I sent and go for it. At my shop we offer a service where you can stand in and watch the repair being done for a small charge. Ask them about it.
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Old 09-29-04, 06:42 AM   #18
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Quote:
Originally Posted by karl210
today i was doin a few miles on my mountain bike and i was just goin up a 1 degree hill at about 10 mph in a normal gear nothin to high or nothin to low and there was a snap. i stopped and i thought the chain snaped so i felt for it and it was still there so i got off and i could spin the pedals forwards and backwards without turning the wheel the cassete will just spin instead of catching and going. do any of you know what i have broke any help will be greatful thanks
Hi
Sounds like your pawl springs in the freehub have gone. Assuming its Shimano freehub , it's a simple business to replace it. Take off the cassette, remove the axle and bearings, then remove the freehub with a 10mm allen key. Take it to your friendly LBS and ask them for a replacement. Re-assemble, making sure the freehub is on TIGHT!
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Old 09-29-04, 10:32 AM   #19
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Karl - there is a quick fix. It's called a mobile phone and a friend with a car . Never bike around without it...
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Old 09-29-04, 02:40 PM   #20
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lol luckily i was about 100 meters away from my home and all down hill so it was ok. i took it half apart today but i got stuck on gettin the cassete off yeah its a shimano i just dont know how to do it
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Old 09-30-04, 12:05 AM   #21
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Quote:
Originally Posted by wrench
Hi
Sounds like your pawl springs in the freehub have gone. Assuming its Shimano freehub , it's a simple business to replace it. Take off the cassette, remove the axle and bearings, then remove the freehub with a 10mm allen key. Take it to your friendly LBS and ask them for a replacement. Re-assemble, making sure the freehub is on TIGHT!
Hey, another echo.....
Dude, scan up to the begining of the post. What you just typed has allready been posted.
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Old 09-30-04, 10:23 AM   #22
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ive hit a problem. i dont know how to get the cassete off lol
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Old 10-01-04, 12:10 AM   #23
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Oh man, for the love of all, just go to your bike shop and have them show you what's up! If you can't get your cassette off you shouldn't be overhauling your hub!!!! It's for your own safety man! Jez.......
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