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Tandem Cycling A bicycle built for two. Want to find out more about this wonderful world of tandems? Check out this forum to talk with other tandem enthusiasts. Captains and stokers welcome!

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Old 12-24-07, 12:11 PM   #1
ricardo kuhn
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Chop, Chop V-brakes, possible STI compatible for use in Tandems

I modified this brakes for my cross bike and so far the results are very Impresive, to the point I beleive they will work for tandem use so I'm posting it here.

Keep in mind I asume no responsibility on this modification (I'm becoming so american scare of ambulance chasers) since the brake arms are not design to be tread it at that point like you need to do to make them work, then again is more than sufficient wall thickness so for all practical porpuse I think they will for a long time..

Ps: If you are not worry about mud clearance or things like fenders, you can run this brakes using the typical V-brake horizontal set up, just move lower, in the case of the cyclocross bike you need as much mud and tire clearance as possible.


Now for the proper posting
Okay I got tired of adjusting Standard Canti brakes trying to make them stop a little better, so I end up hacking up a set of the newer XT brakes that I never really like, yes to see what will happen.

Yes I know my Hybrid front tire is lamme, I'm waiting for a Little Bro-deal coming soon

As you can see they have tons of mud clearance


I cut them about 3 milimiters above the spring retainer.


For the Quick release side I use a piece from a WTB canti brake, i just tap a 4 mm tread, shape the head of the bolt so the QR WTB piece will not come off no matter what (Shave sides) then I use a spacer about 8MM long (Two spacers from the rollers of a 8speed chain)


The quick release action is super easy.


More than sufficient clearance in between the bolts and the seatstays, at least on the Empella frame


Same thing for the back


Well the best part is that they work a lot better, no mussy feel at the lever, much more braking power,(I can not even run the RED pads in the front since they have to much stoping power)

I don't think they are perfect but for sure they are far better than any cantilever brake I have ever try.


I keep you guys and gals Updated when I find the parts to make prototype number II

Last edited by ricardo kuhn; 12-25-07 at 06:55 PM.
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Old 12-24-07, 12:37 PM   #2
Leigh_caines
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Neat work
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Old 12-24-07, 02:41 PM   #3
JanMM
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Clever.
But, why not use V-brakes?
STI lever compatibility?
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Old 12-24-07, 02:56 PM   #4
LWaB
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Close clearances on the pads, just saying...
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Old 12-25-07, 04:33 PM   #5
ricardo kuhn
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Quote:
Originally Posted by JanMM View Post
Clever.
But, why not use V-brakes?
STI lever compatibility?
Because you need a "Potentiometer" A device that will change the short pull of the STI lever to the long pull require to operate the ful length V-brakes.

Generation II will use full size V-brakes with a set of "Cams" operated on a linear fashion to decrease cable damage and improve lever feel and performance.
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Old 12-25-07, 04:38 PM   #6
ricardo kuhn
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Originally Posted by LWaB View Post
Close clearances on the pads, just saying...
Well they are the same as any other V-brake will be, unless I'm not understanding the comment.

so far with about 30% of the STI lever travel I can move the pads from about 1MM away to full stopping power, if I set them loser (more cable travel) I can have about 2mm of brake pads distance for mud clearance but still only need about 55%/60% of the lever pull.


In contrast using cantilever's (even wide type like Mafac's) the brake lever was bottoming out with out reaching full stoping power.

Last edited by ricardo kuhn; 12-25-07 at 04:57 PM.
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