a nice mod for single pivot sidepull calipers....

[Robin Hubert]

Ron Ruff wrote:
> I'm thinking about getting some old calipers now... but my memory is
> foggy...
>
> Are there any issues with leverage ratios using modern levers... and
> how do you deal with the nutted pivot bolt?
>

Do it. I'm running old single pivot brakes on both my bikes and they
are perfectly compatible with modern levers. I get two finger braking
and can easily raise my rear wheel. On top of that I can run my pads a
good enough distance from my rims that I can remove my 28mm tires
without opening the QR's. This also makes wobbly wheels rideable.
Addtionally, these brakes are simple in design and can be easily and
completey serviced. Dual pivot brakes have bolts retained with thread
locking compound. Not necessary on classic sidepull brakes such as the
Shimano, Suntour, and Campagnolo brakes.

My user sets are Dura Ace 7402's and Suntour Superbe (Campagnolo
knock-off). My reserve sets are Campagnolo Record and Super Record.

I cut new threads onto the front and mount it on the rear, and the rear
in front. There was a big discussion about the dangers of this a while
ago. I'll let you know if anything catastrophic happens.



Robin Hubert

 

[John Thompson]

On 2006-04-23, Ron Ruff <[email protected]> wrote:

> I'm thinking about getting some old calipers now... but my memory is
> foggy...
>
> Are there any issues with leverage ratios using modern levers... and
> how do you deal with the nutted pivot bolt?

No problems with leverage here. As to the nutted pivot bolt -- you can
either chop it off, cut some new threads and use a "modern" allen fitting,
or use a washer. You used to be able to get nice shouldered brass washers
for exactly this purpose; Rivendell offers a nylon piece for the same
purpose:

http://www.rivendellbicycles.com/webalog/brakes/15052.html

--

John ([email protected])

 

[Alex Rodriguez]

In article <[email protected]>,
[email protected] says...
>
>
>Sal Bass writes:
>
>> http://i15.photobucket.com/albums/a386/ipodusersmustdie/Mvc-045f.jpg
>
>> has this been done before? is this a common fix?
>
>All dual pivot brakes that I have looked at have such a plastic
>sleeve. Don't worry, that will also get full of road grit and cause a
>non-centered caliper return. The real solution is to make a return
>spring that doesn't have the stoooopid elephant ears, but rather coils
>around the center-bolt. Then there is no cosine error and sliding at
>the retention lug. I've designed such a spring but because I am not
>in the brake manufacturing business, you can't buy them.
>
>Spring articulation is approximately at the center of the elephant ear.

The last generation Suntour Superbe Pro brakes were designed this way. I think
Dia-compe also sold a set of similar braks.
-------------
Alex