Cycling Mob: Road Cycling, Mountain Biking and More - View Single Post - Front shifter fails after replacing crankset

07-11-2004, 09:26 AM

On Sun, 11 Jul 2004 17:05:14 +0100, "Daniel Kelly \(AKA Jack\)"
<d.kellyNOSPAM@NOSPAM.ucl.ac.uk> wrote:

>Hi,
>
>I've just upgraded my crankset and bottom bracket. And now I can't change
>gears on the front derailleur. I've tried moving and adjusting the front
>derailleur.
>
>I think the problem may have 2 causes:
>
>1) I have an old, worn, 8-speed chain. The crankset is 9-speed. The
>8-speed&9-speed combo shouldn't be a problem but I suspect the old chain
>might be too worn to work. My worry is that although people did tell me
>that shifting performance would be 'poor', they didn't say the performance
>would be non-existent. Since upgrading, it's actually impossible to
>controllably change gear, even if I push the derailleur way out. It's
>possible to change from the large to the middle but impossible to go from
>middle to large.
>
>2) Before buying the BB and crankset, I read that the crankset needs the
>longest available BB axel, so I got 121mm BB. But perhaps this is a little
>too long, resulting in the front chainwheels being pushed too far away from
>the frame?
>
>My new BB is the Shimano LX Splined ES51 and the Crankset is the LX Splined
>9sp M571 170mm 22.32.44
>
>I've taken some photos to illustrate my problem:
>
>http://www.xlk.org.uk/forum/modules....view_album.php
>
>Thanks in advance for your help,
>Jack
>

Looking at pictures 5, 6 and 7, your front derailleur is positioned
very high, far away from the chainrings. It's going to be hard to get
clean shifting with it so high.

http://www.sheldonbrown.com/derailer...ent.html#front

You might start from scratch and follow these steps one by one.

07-11-2004, 09:26 AM	#6 (permalink)
Dan Daniel Posts: n/a	Re: Front shifter fails after replacing crankset On Sun, 11 Jul 2004 17:05:14 +0100, "Daniel Kelly \(AKA Jack\)" <d.kellyNOSPAM@NOSPAM.ucl.ac.uk> wrote: >Hi, > >I've just upgraded my crankset and bottom bracket. And now I can't change >gears on the front derailleur. I've tried moving and adjusting the front >derailleur. > >I think the problem may have 2 causes: > >1) I have an old, worn, 8-speed chain. The crankset is 9-speed. The >8-speed&9-speed combo shouldn't be a problem but I suspect the old chain >might be too worn to work. My worry is that although people did tell me >that shifting performance would be 'poor', they didn't say the performance >would be non-existent. Since upgrading, it's actually impossible to >controllably change gear, even if I push the derailleur way out. It's >possible to change from the large to the middle but impossible to go from >middle to large. > >2) Before buying the BB and crankset, I read that the crankset needs the >longest available BB axel, so I got 121mm BB. But perhaps this is a little >too long, resulting in the front chainwheels being pushed too far away from >the frame? > >My new BB is the Shimano LX Splined ES51 and the Crankset is the LX Splined >9sp M571 170mm 22.32.44 > >I've taken some photos to illustrate my problem: > >http://www.xlk.org.uk/forum/modules....view_album.php > >Thanks in advance for your help, >Jack > Looking at pictures 5, 6 and 7, your front derailleur is positioned very high, far away from the chainrings. It's going to be hard to get clean shifting with it so high. http://www.sheldonbrown.com/derailer...ent.html#front You might start from scratch and follow these steps one by one.