Discuss.


Found on a 41cm (!) Mixte on CL in portland.

Dual pivot

Jake

KO. End of discussion.

Does it work? Took me a while to figure out how to tune it, but it shouldn't be a problem (in theory). Looks cool/dorky.

So would both brakes pull at the same time? Interesting. I saw a friend's 70s tandem this morning, which had a rear canti brake plus a rear sidepull brake, but they operated from two separate levers.

Neal

I assume ( as long as return springs have even force) that the cable pull from the brake would be distributed evenly between the two calipers, and while it may work in theory, even in practice, why?

Edit: perhaps on a loaded bike on descents it would be handy to have the heat spread over 2X the pads, and in the rear not as much modulation is needed. But its only applicable on tandem and mixte frames. I have seen double length pivot studs for double brake arms, again I feel like modern longer brake pads or just modern brakes would solve any issue.

that is an excellent setup.

Now what somatotype would require both a 41 cm frame and two rear brakes? Or maybe it's someone who likes to do skidz . . .

Double brakes! What does it mean?

My guess is that some previous owner (or, given it's a 41CM, some well-meaning dad or boyfreind) saw that the brake bridge had a hole in it and believed that it was for another brake that had gone missing, and "replaced" it. It looks to be a sano setup, and my bet is that it would work well. Or at least as well as calipers on a steel rim in the rear ever do.

i think its b@d@$$

I had never really wanted a mixte... Before.

As I see it, the brakes would pull evenly if their springs are equally tough; otherwise, the brake with the softer spring will engage first. As soon as that happens, the brake with the stronger springs will engage. Neither brake will put much pressure on the rim until both do.

The problem, I guess, will be the amount of cable travel. This system will require twice as much cable travel as one brake. So as long as the wheel is (very) true, and both brakes are adjusted pretty tight, the lever should have enough travel to engage both. But if the lever bottoms out before both brakes are fully engaged, this will be worse than a single brake.

Cool idea, either way, though!

Designed by company legal department.

lol!

Double brakes all the way!

Getting rear side pull brakes (old ones) to work decently is a major PIA. THAT may be the best answer I have seen (besides a decent centerpull).

I'd be concerned about the amount of lever pull needed for this setup.

That's really just too cool...

Love it!

Fodder for those who believe the front break is dangerous and will flip you.

In other news, that's a small bike!

It seems to me that the tires would skid before the pads would slip on an aluminum rim of a single rear brake set-up.
Maybe this set-up was designed as an answer to wet steel rims?

HAHAHAHA, what's next, calipers in front of AND behind the fork?

Oh PLEASE, someone try that. I do enough 'sperimentin'

it just needs a U-brake under the chain stays

wait if i'm following this right we could put a total of 5 caliper brakes on one mixte?

one of the upper seatstays
one on the middle seatstays / downtube things
one under the chainstays
one infront of the fork crown
and one behind the fork crown

i think i could stop an elephant with that much braking force