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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 01-13-03, 04:57 PM   #1
dan the gimp
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Possible solution to the singlespeed Gimp bike!

Well one of you awesome guys posted a link to a site about friction gearing, I clicked it and browsed. Then to my disbelief I saw these little things!

http://www.rivendellbicycles.com/web...urs/17095.html


Anyone want to guess the problem with them on my frame??!!

Apart from that they could be one of the only solutions to getting my bike shifting.
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Old 01-13-03, 05:09 PM   #2
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Originally posted by dan the gimp
Well one of you awesome guys posted a link to a site about friction gearing, I clicked it and browsed. Then to my disbelief I saw these little things!

http://www.rivendellbicycles.com/web...urs/17095.html


Anyone want to guess the problem with them on my frame??!!

Apart from that they could be one of the only solutions to getting my bike shifting.
Yeah,wrong size.they go on a downtube. I have a clamp on that goes on a chainstay.Never saw another like it.Gonna keep it.Sorry.
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Old 01-14-03, 09:41 AM   #3
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Dan,
Funny you should post this. I was browsing the QBP catalog last night and came across a clamp-on stop that made me think of your problem. The one in the QBP catalog is better looking, all smooth with a little recessed allen screw. Unfortunately, Pokey is right. These clamps are for top, seat, or down tube, sizes 1.125, 1.25, 1.375. You still need something for the chainstay to anchor that final cable housing loop to the der. You could use an Avid Rollamajig, which might be better in this case, but you still need something to direct the cable straight back.

Here is a possibility. Is there a threaded hole in the bottom of your bb shell? Even if there is not you could have your LBS drill one of appropriate size and tap it for a screw that will attach a plastic cable guide. That might solve your problem. Here is the whole picture. From your shifter a piece of cable housing down to on of the clamp on stops on your downtube, positioned about where a downtube shifter would be. Bare cable from there down to the bb, through the plastic cable guide, straight back to the Rollamajig on the rear der. Obviously you will have to check whether such a setup would work on your frame. You may have to adjust it here and there so that the cable doesn't rub the frame. One of my road bikes has this type setup except that it does have a chainstay stop so I am using a regular setup with a housing loop to the der. The plastic under-bb cable guides are in the QBP catalog, too.
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Old 01-14-03, 07:47 PM   #4
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Pokey:

Where did you get this clamp that you have that is rare?? If you knew that would be awesome!

RainmanP:

Happy Birthday! Thanks for the suggestion of having BB shell guides, but I live in the UK! Rain is frequent here, and on a steel frame, with a large BMX BB and crank, the cold and damp will do nasty things to my 'steed'. Do you know where I can get one of these catalogues you mentioned?

Oh and I just got a Hope Bulb Disc Hub, laced to a Mavic D521CD rim, very secure and loud 'clicks'
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Old 01-14-03, 07:52 PM   #5
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Shall i just buy a high quality gear outer and run it from shifter to derailleur? that will act as the 'stops' I need, right?

I am buying a XT rear mech on friday, and already have an XT shifter, with my new wheel too, and if I buy a rollamajig- surely that will help make things run nice. Should be able to get more than 3 gears. Even if the shifting still isnt perfect, its better than no improvement.
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Old 01-15-03, 08:00 AM   #6
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Originally posted by dan the gimp
Pokey:

Where did you get this clamp that you have that is rare?? If you knew that would be awesome.
It came off a old bike I fonud in a thrft store.A real one of a kind.
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Old 01-15-03, 08:03 AM   #7
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Originally posted by dan the gimp
Shall i just buy a high quality gear outer and run it from shifter to derailleur? that will act as the 'stops' I need, right?

Might work if it does not create too much friction.Many old briction systems used long lengths of cable,but indexing precision over 9 cogs was not an issue either.
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Old 01-15-03, 10:04 AM   #8
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Dan,
It is the Quality Bicycle Products (QBP) catalog. QBP is one of the largest distributors of bike products. Almost all bike shops purchase from them. I was always asking my LBS "Can you get me such-and-such?" One day he asked if I would just like to buy a catalog so I could browse at leisure. It cost about $8, but it has been worth it.

You know, sometimes I could just slap myself. I just had one of those "Doh!" minutes. Thethirdhand.com has a clamp on chainstay stop. Sounds like the one Pokey mentioned. Check it out:

http://www.thethirdhand.com/index.cg...id=34219729151

If this link doesn't work, go to the site then select
Cable/Casing > Clips and Stops > Casing Stops

They also list a clamp on cable guide that clamps to the seat tube just above the bb. It only comes in 1 1/8", standard road bike tube diameter, so I don't know if that will work on your bike or not.

The chainstay stop is $1.00 and the guide is $3.75. Both are Shimano products. If you have something like Loose Screws in the UK you might check with them since shipping would probably cost a lot more than the parts.
Regards,
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Old 01-16-03, 07:04 PM   #9
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cheers Raymond!

However I am unsure of how to order from them, there info is unclear, and i dont want to be charged a bomb for delivery- i live in the UK.

If i can get something similar in england i'd be v.happy, suppose il have to try google.com

thanks for your help, let me know if you find anything in 's and other details.

Thanks

Daniel
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Old 03-24-07, 01:43 AM   #10
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