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Bad Chainline, Noisy Hub on a Bike Shop Conversions - Help!

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Bad Chainline, Noisy Hub on a Bike Shop Conversions - Help!

Old 04-24-08, 08:02 PM
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theconquerorwor
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Bad Chainline, Noisy Hub on 2 Bike Shop Conversions - Help!

There is a used bike shop around here, specializing in old lugged frames and conversions, etc.

Anyway, tonight I got back my Fuji Espree from them, after they finished converting it to single speed. However, when I got it home and elevated it to add some lube, I noticed that when I turned the cranks:

1. The chain begins to vibrate like crazy back and forth and make a bad grinding sound

&

2. When I stop turning the cranks, the back wheel only spins for a few more seconds and there is a terrible rattle sound coming from the hub, like the bearings are rolling around in there with no grease.



I checked out my wife's old Schwinn Sprint, which was also converted, and the chain does the same thing with the terrible back and forth vibration and grinding.


Are they doing these conversions on the cheap? What's the best way to fix this chainline?

I feel like I've spent too much money on these bikes already!

HELP!!

I can take some photos if I need to..


Thanks!

Last edited by theconquerorwor; 04-24-08 at 08:41 PM.
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Old 04-24-08, 08:13 PM
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Sounds like they pulled the whele back too much and the drivetrain is now binding eveywhere. It's simple to fix. I doubt it's the chainline unless it's off by a meter.

Last edited by operator; 04-24-08 at 08:28 PM.
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Old 04-24-08, 08:17 PM
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You should be able to see for yourself if it's the chainline. Just see if the chain is straight or if it leaves the chainring at an angle.
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Old 04-24-08, 08:20 PM
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how much can you jiggle the chain?
a little slack is a good thing, and it sounds like it's really too tight and that's why it's rattling side to side and not spinning on its own.
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Old 04-24-08, 08:28 PM
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Originally Posted by 666pack View Post
how much can you jiggle the chain?
a little slack is a good thing, and it sounds like it's really too tight and that's why it's rattling side to side and not spinning on its own.
You should have about 1/2" play up and down. My bet is on too tight chain.
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Old 04-24-08, 08:40 PM
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yeah, the chain was definitely super-tight. i just loosened the wheel and a lot of the noise went away. the wheel even seems to spin a bit better as well.


however, i'm just not sold on the chainline. see below:





here is my wife's chainline, for grins. they put a new back wheel on hers though:

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Old 04-24-08, 08:49 PM
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Wow. What a ****ty job from your shop. Please, go ahead and post the name so others can avoid it.
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Old 04-24-08, 08:50 PM
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The chainline is deffinately off.

Double check to make sure the rear wheel is straight
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Old 04-24-08, 09:00 PM
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i cant believe someone sold you a bike with a chainline like that. how unscrupulous.

probably have to respace/redish the rear wheel to get the cog out towards the stays, which is what the shop should have done before they sold it. see that fat spacer between the cog and the stays? that shouldnt be there.
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Old 04-24-08, 09:06 PM
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The chain makes like a 45 deg angle off the chainring, lmao.
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Old 04-24-08, 09:08 PM
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the place is called nearly new in chicago. you probably won't find it, but if you do. steer the f8ck away.


alright. so better question is, now what? just an axle respacing? new back wheel?

hating bikes...
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Old 04-24-08, 09:20 PM
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Originally Posted by theconquerorwor View Post
There is a used bike shop around here, specializing in old lugged frames and conversions, etc.

Anyway, tonight I got back my Fuji Espree from them, after they finished converting it to single speed. However, when I got it home and elevated it to add some lube, I noticed that when I turned the cranks:

1. The chain begins to vibrate like crazy back and forth and make a bad grinding sound

&

2. When I stop turning the cranks, the back wheel only spins for a few more seconds and there is a terrible rattle sound coming from the hub, like the bearings are rolling around in there with no grease.



I checked out my wife's old Schwinn Sprint, which was also converted, and the chain does the same thing with the terrible back and forth vibration and grinding.


Are they doing these conversions on the cheap? What's the best way to fix this chainline?

I feel like I've spent too much money on these bikes already!

HELP!!

I can take some photos if I need to..


Thanks!
im pretty sure i know where you went....just take it back up there, they will help you out

edit: didnt read the rest of the thread before i posted this. They are cool guys...just go talk to them, I wouldnt say stay away...alot of people in Chicago like that place
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Old 04-24-08, 09:23 PM
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Originally Posted by Judge_Posner View Post
i cant believe someone sold you a bike with a chainline like that. how unscrupulous.

probably have to respace/redish the rear wheel to get the cog out towards the stays, which is what the shop should have done before they sold it. see that fat spacer between the cog and the stays? that shouldnt be there.
Regardless of the fact that they did a botched job on it (I hope they didnt charge you more than 20 or 30 dollars), the fix is most probably in the bottom bracket. Measure how far off the chainline is in front by sighting down the chain from where the chainring should rest to put it at an even chainline. Measure the error in millimeters. Then pull the bottom bracket out and find the spindle length and subtract double the number you found before and find a bottom bracket with a spindle of that length. You can probably find a sealed bottom bracket for 20 or 30 dollars that should do well for you and fix your chainline issue.


Edit: that "big spacer" is there because they replaced a presumably 5 or 6 speed freewheel in the back with a single speed one.
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Old 04-24-08, 09:32 PM
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dude, take the bike back and demand they fix that ****. no way should a shop let a bike leave that's put together wrong. i don't care if people do like that shop; they clearly don't know what the hell they are doing. it's not even that hard to get a straight chainline! respace, redish, call it done.
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Old 04-24-08, 09:37 PM
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the reason i went there in the first place was because they were "nice guys" and "people in chicago liked them" - but to be honest, they charged $75 dollars for this bullsh&t and i'm going to be sure to let everyone know how terrible things are there.
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Old 04-24-08, 09:48 PM
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Originally Posted by theconquerorwor View Post
the reason i went there in the first place was because they were "nice guys" and "people in chicago liked them" - but to be honest, they charged $75 dollars for this bullsh&t and i'm going to be sure to let everyone know how terrible things are there.
I would try and get it fixed before you go sounding the war horns. Everone on the internet can tell you the right way to do something, but there is something to be said for good old fashioned bike shops, go see the guys, if they were nice guys to begin with it's worth a shot.
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Old 04-24-08, 09:54 PM
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What they neglected to do was re-space the hub and re-dish the wheel. That fact is painfully obvious in the picture.
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Old 04-24-08, 09:57 PM
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its not even a bike shop...its a used shop and because the trend now is ss/fixed they will convert for people. One guy on the net pissed off isnt going to change things...If your going to a used bike shop (again, i stress, its just a empty room w/ bikes piled on top of each other) you should probably have an idea of what your buying.

just go up there and see what they say
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Old 04-24-08, 10:03 PM
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For $75, eek.
Maybe ~$20 for a freewheel. So they charged you $55 to pull the old freewheel and put another one on with out the decency to dish the wheel or check the chainline. Well I guess they did pull off a chainring to keep in their parts bin. Soooo...
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Old 04-24-08, 10:28 PM
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Originally Posted by jilla82 View Post
=If your going to a used bike shop (again, i stress, its just a empty room w/ bikes piled on top of each other) you should probably have an idea of what your buying.

ah, so it's my problem that they did a sh*tty job on this conversion? if i knew what to do, i'd have done it myself.

the worst part is, i knew enough when i dropped it off to ask if they would redish the back wheel and he told me "it probably doesn't need it, but we'll do it if it does.."
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Old 04-24-08, 10:36 PM
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Originally Posted by theconquerorwor View Post
ah, so it's my problem that they did a sh*tty job on this conversion? if i knew what to do, i'd have done it myself.

the worst part is, i knew enough when i dropped it off to ask if they would redish the back wheel and he told me "it probably doesn't need it, but we'll do it if it does.."
go back and have them fix the problem, he said he'd fix it if there was a problem. It's definitely not your problem at all, a shop should stand behind their work further than just out the front door.
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Old 04-24-08, 10:56 PM
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Originally Posted by theconquerorwor View Post
ah, so it's my problem that they did a sh*tty job on this conversion? if i knew what to do, i'd have done it myself.

the worst part is, i knew enough when i dropped it off to ask if they would redish the back wheel and he told me "it probably doesn't need it, but we'll do it if it does.."
im not the one crying over the net w/o even going back to the shop to see what they say.
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Old 04-24-08, 11:13 PM
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It's not off by 45 degrees (cause no chain can handle that) but they did do a poor job... a different bb, mounting the chain ring to the inside (if possible), or re-spacing and re-dishing the wheel are all options.

When I convert 5 and 6 speed bikes to ss (with a freewheel) I can usually get a very good and usually excellent chain line by simply mounting the chain ring to the inner or middle ring position and with a cassette hub it's child's play.

I would take it back and give them the opportunity to rectify the situation as they did not deliver as promised.

75.00 ?

Damn.
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Old 04-24-08, 11:19 PM
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Both are fixed drives and are my work (and my rides).

Chainline on my ghetto hub with a re-spaced and redished wheel.



Sag... just a little so that there is no point where the chain binds.
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Old 04-25-08, 04:19 AM
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Originally Posted by Sixty Fiver View Post
Both are fixed drives and are my work (and my rides).

Chainline on my ghetto hub with a re-spaced and redished wheel.

Sag... just a little so that there is no point where the chain binds.
Whoa. What ratio do you have on this bad boy? Looks pretty epic.
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