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PostPosted: Tue Dec 27, 2016 6:41 pm 
Old School Hero

Joined: Tue Dec 20, 2016 11:14 am
Posts: 158
I've just taken off my knackered 10T Jockeys off a STX-RC derailleur which is running a 7 speed block. It's narrow bio-pace chain, and the TAC-X top hat bushes for their 10T wheels mean the bolts are just that bit short.

Can I just carefully rub a mm down on each side of the nylon top hat bushing? (I presume I'm not meant to re-use the original Shimano metal covers too...)


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PostPosted: Wed Dec 28, 2016 5:05 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 9181
Location: New Forest, UK
Tacx usually come with two or three different sets of top hats - make sure you use the right ones. I suspect you have fitted the Campagnolo set. It's in the instructions.


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PostPosted: Thu Dec 29, 2016 10:23 pm 
Old School Hero

Joined: Tue Dec 20, 2016 11:14 am
Posts: 158
no, I have the right ones. but the original wheels are "narrow" and the Tac-X ones, with the width of the top hats, are only going to get me a couple of turns on the securing bolts for the cage. So I'm considering sanding down the flats of the top hats by a mm or so...


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PostPosted: Fri Dec 30, 2016 10:18 am 
Old School Grand Master
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Joined: Mon Jun 14, 2010 9:06 pm
Posts: 4861
Location: Herts UK
ISTR having done similar without any issues. Place sandpaper on a flat surface and move part across it checking visually and using calliper to ensure even removal of material.


Or if you have a drill press, push down onto a file, a lathe would be ideal.


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PostPosted: Fri Dec 30, 2016 10:19 am 
Old School Hero

Joined: Tue Dec 20, 2016 11:14 am
Posts: 158
ooh - very good idea about the drill press... thanks!


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PostPosted: Fri Dec 30, 2016 12:15 pm 
Old School Grand Master
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Joined: Mon Jun 14, 2010 9:06 pm
Posts: 4861
Location: Herts UK
Drill press method will keep the end square, using a file may work if not, coarse sanding sheet, cloth based as paper is likely to tear will work, placed on flat surface, will do the job. Take it sliw as you dont want to take too much.


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PostPosted: Sun Jan 01, 2017 9:30 am 
Retro Guru
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Joined: Tue Jun 25, 2013 10:47 am
Posts: 1145
But keep in mind that the top jockey wheel needs some play sideways for correct operation!


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 Post subject: Re:
PostPosted: Sun Jan 01, 2017 11:52 am 
Old School Hero

Joined: Tue Dec 20, 2016 11:14 am
Posts: 158
hmm. hadn't thought of that and it might be a problem..

Do they still make narrow 10 tooth jockeys?


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PostPosted: Mon Jan 02, 2017 12:26 pm 
Retro Guru
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Joined: Tue Jun 25, 2013 10:47 am
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As far as I know, the tracx wheels for 7 and 8-Speed are the same. Same width. They come with different width shims. You can trim down the 7speed shims to 8speed size. But you must take care of the sideways play. Dont file off too much in the wrong places. ;)


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PostPosted: Tue Jan 03, 2017 10:11 am 
Old School Hero

Joined: Tue Dec 20, 2016 11:14 am
Posts: 158
OK, so if this 86-ish bike is Biopace and 500LX, it has "narrow" marked in places on the chainset.

Do I thus assume that comes from its then-newness in comparison to a formerly even larger chain size that was fitted to pre-7 speed ??


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