acidfast7

Just curious why they're so popular here?

Seems that most reasonable trekking/expedition/commuting bikes run the HS33 or HS11 by Magura:

HS33: https://www.magura.com/en/bicyclecomp...kes/hs-33.html

HS11: https://www.magura.com/en/bicyclecomp...s-11-pure.html

and perhaps that's why we seem to be going through rim sidewalls so quickly.

anyone have specs on the lateral pressure exerted by these compared to "standard" rim brakes?

Wil Davis

To quote my old granny: "…it never ceases to amaze me what folk would rather have than money!"

- Wil

acidfast7

I just did a quick but of shopping and saw maybe 10 bikes with hydraulic rim brakes.

Some even had the front and rear rim wear tracks showing through

Burton

No specs - just a lot of interest myself! I was thinking that a combination of Magura hydraulic rim brakes and Rigida SSC tungsten coated sidewalls would address both issues. People seem to agree that larger rotors are a good idea (at least thats what they're buying), and using the rim as a rotor gives the maximum size possible. After that - it really takes only so much pressure to lock up a wheel - regardless of the kind of brakes used. Hydraulics largely just give better modulation and more mechanical advantage.(less effort)

acidfast7

I also assume they're super low maintenance, as the guys I talk to only flush the system when they replace the rim (usually with a new entire wheel). So, no cable freezing/replacement. However, I don't think people would add them aftermarket, it's just that almost all of the common German trekking bike companies use them:

VSF: https://www.fahrradmanufaktur.de/bikes/trekking/
Gudereit: https://www.gudereit.de/newsite/trekkingline-gesamt.php

unterhausen

I thought they were gone for good. Don't think there are any available in the states

acidfast7

Maybe because they're "Made in Germany", the German OEMs still use them. Never saw them in the states.

This thread is more of a spin-off about rim wear from the commuting on an MTB thread. Most people I know get roughly 10000km to a rim and most run these brakes (the 33s), so I wonder if they're harder on rims?

Dwayne

I used to run Magura Racelines on my old full suspension, bought them when they first came out, was living in Germany at the time. The Magura pads aren't as long as the modern v-brake pads, but that's the only real difference I can think of. You're not applying any more pressure to the rim compared to a v-brake, if you were, you'd be braking harder or locking up the wheel. Doesn't matter how the power gets there, whether via cable or hydraulic fluid. The pad size will make a small difference, but I can't imagine it would be enough to make the rims wear faster. Hmm.. I do remember the standard Magura pads being a hard compound though... I think that might be a big factor, the pads would often get metal slivers embedded in them, that will chew a rim up much faster.

fietsbob

[guess] #1) they are made there.. in Germany.. I have a HS33 set, having bought a NL built KogaMiyata trekking bike.

[on my 3rd set of pads, 2 black, now the red-salmon compound .. Kool Stop, made for Magura.. in Oregon.

The fact that they are low mainenence means most people just ignore cleaning the grit out of the brake pads
just like most people ignore servicing bikes, in general, until things fail.

you have to pull the wheel out, a bit, to pop off the pad on one side (but they do snap in place)


it's when the rim wear track does not show , that is the issue, but then you must know If the track was
part of the rim when new, in the first place .. that means knowing which rims shipped with a wear track
and which don't.. (18 rims here & 0 had rim wear tracks, from the get-go)

not true, but as the US sold OEM stuff ships out of Asia, their bikes got built with parts, made there.
Magura USA, is in Olney Il. your LBS can Order from them, if you want some.

may I suggest going to the mechanical engineering department of the University, and funding a study of that?
someone did give a reasonable answer on basic observation, but if you want Data.. use Science.

martianone

advantage of hydraulic rim brakes ?
they "feel good" - had a set on my street machine a few years ago, before discs were really common, modulation was great & stopping power was consistent, compared to rim brakes at the time.

fietsbob

And Hydraulics , it does not matter how far the master cylinder and the slave cylander are separated.