Disc Brake Installation Question

Wolverbob said:

I am thinking of installing a new rear wheel on my Ryan Duplex with a disc brake. My big question
is how does the brake caliper mount on the frame? In some cases, are new attachement points needed
to be welded on? Thanks in advance for any advice.

Hi Bob! Yes it will likely require additional mounts, since your Ryan probably doesn't already have
them. Here is what my V-Rex looks like with a rear disc. The mounting plate was brazed to the top of
the dropout, so it is the same distance from the rotor as the rest of the dropout. Placement up
toward the seat is the hard part. It would be best to get the wheel and disc assemblies first, then
you can mount the caliper and run it up the seat stay until you get the right clearance. You want
the pads to be fully on the rotor, but you don't want the rotor rubbing against the top of the
caliper slot. biketcba.orgvrex2.jpgOpen ↗ biketcba.orgvrex3.jpgOpen ↗
--

John Foltz --- O _ Baron --- _O _ V-Rex 24 --- _\\/\-%)
_________(_)`=()___________________(_)= (_)_____

[email hidden] (Wolverbob) wrote in message
news:<[email hidden]>...

Quoted message said:

I am thinking of installing a new rear wheel on my Ryan Duplex with a disc brake. My big question
is how does the brake caliper mount on the frame? In some cases, are new attachement points needed
to be welded on? Thanks in advance for any advice.

Bob Krzewinski

Disc brake mounts are available from any frame parts supplier, such as Gaerlan:
gaerlan.combrazeons.htmlOpen ↗

Installing disc brake mounts is a job for a framebuilder. It requires close-tolerance machining and
welding- and your Duplex will almost certainly require some custom fabrication.

Next question: which disc brake do you plan on using? There's very few that are tandem-rated. Most
will warp or otherwise show ill effects from the excessive heat that slowing a tandem on a long
downhill can generate. Just a couple weeks ago I assisted a tandem rider perform a roadside
brake-ecktomy when his rear disc overheated and permanently warped. They finished a century ride on
the front brake alone.

Jeff

Did you happen to notice and will you tell the group what brand and size?

"Jeff Wills" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Next question: which disc brake do you plan on using? There's very few that are tandem-rated. Most
will warp or otherwise show ill effects from the excessive heat that slowing a tandem on a long
downhill can generate. Just a couple weeks ago I assisted a tandem rider perform a roadside
brake-ecktomy when his rear disc overheated and permanently warped. They finished a century ride
on the front brake alone.

Jeff

"Doug Huffman" <[email hidden]> wrote in message
news:<[email hidden]>...

Quoted message said:

Did you happen to notice and will you tell the group what brand and size?

I think it was a cable-operated Formula brake with a 6" rotor. Not tandem-rated, IIRC.

FWIW: there's some interesting reading in the Formula cable-over-hydraulic tandem-specific disc
brake, reprinted by Gears-to-Go Tandems: gtgtandems.comcontents.htmlOpen ↗

This is the sentence that I find most relevant: "A traditional bicycle rim brake is, in fact, a disc
brake, one that is incomparably light and elegantly simple in operation."

Jeff

Jeff Wills said:

This is the sentence that I find most relevant: "A traditional bicycle rim brake is, in fact, a
disc brake, one that is incomparably light and elegantly simple in operation."

They missed three words off the end - "until it rains"

Dave Larrington - legslarry.beerdrinkers.co.uklegslarry.beerdrinkers.co.ukOpen ↗
===========================================================
Editor - British Human Power Club Newsletter
bhpc.org.ukbhpc.org.ukOpen ↗
===========================================================

It's still light and simple. Just ineffective too.

--
David Luecke Ridin' a RANS Vivo (wahoo!) Merritt Island, Florida USA

Quoted message said:

They missed three words off the end - "until it rains"

and

"You may ignore the above by using some Avid SD7s with rim wranglers."

Really, these things stop my rocket almost instantly if I want. Even when wet.

before looking at all the disc work, I'd check into what the Mountain bikers use for stoppers -- and
a lot of them swear by after-market V-brakes.

Also, any reason why the disc on the rear instad of the front?

Seth Jayson said:

Quoted message said:

They missed three words off the end - "until it rains"

and

"You may ignore the above by using some Avid SD7s with rim wranglers."

Really, these things stop my rocket almost instantly if I want. Even when wet.

What about in freezing slush?

Tom Sherman - Quad Cities USA (Illinois side)

Seth Jayson said:

"You may ignore the above by using some Avid SD7s with rim wranglers."

Really, these things stop my rocket almost instantly if I want. Even when wet.

Not on a Speedmachine. Discs only. I now have a Hope M4 on the front and a Mini on the rear and they
do it all over any rim brake I've ever used from a great height.

Quoted message said:

Also, any reason why the disc on the rear instad of the front?

The bike in question is a Ryan Duplex - lots of weight over the rear wheel.

Dave Larrington - legslarry.beerdrinkers.co.uklegslarry.beerdrinkers.co.ukOpen ↗
===========================================================
Editor - British Human Power Club Newsletter
bhpc.org.ukbhpc.org.ukOpen ↗
===========================================================

Dropout spacing for a disc is 135 mm, your frame may need to be re-sized. Paul Components makes a
"no weld" adapter to mount a disc to any bike. Use the 205 disc diameter to soak up the heat. Only
use cable operated style. I have seen the plastic line on a hydraulic system melt off from the heat
and almost turn into a fatality. Almost lost a good friend to something I built. Rim brakes are a
form of disc brakes, so the heat goes into the tire, which can cause a blow-out. I have seen several
accidents cause from this. All on long downhills. Speedy

Wolverbob said:

I am thinking of installing a new rear wheel on my Ryan Duplex with a disc brake. My big question
is how does the brake caliper mount on the frame? In some cases, are new attachement points needed
to be welded on? Thanks in advance for any advice.

Bob Krzewinski

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I have seen the plastic line on a hydraulic

Quoted message said:

system melt off from the heat and almost turn into a fatality. Almost lost a

How 'bout the kevlar line, like on the SRAM hydro disc?

I Asked Paul Componets, below their reply: Erik-

That is the Disk Unit. Right now it only works with our single speed disk hub, but there is an 8/9
speed hub ready to go this fall.

Have a good ride,

Paul ----- Original Message ----- From: Erik Vandamme To: [email hidden] Sent: Wednesday, July
09, 2003 4:54 PM Subject: Disc Brake mount

Hi, In the recumbent cycles newsgroup it says: Paul Components makes a "no weld" adapter to mount
a disc to any bike. Looking at your web site I cant find the product? I have a "standard" 8 speed
cluster. Erik Vandamme

"S. Delaire "Rotatorrecumbent"" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Dropout spacing for a disc is 135 mm, your frame may need to be re-sized. Paul Components makes a
"no weld" adapter to mount a disc to any bike. Use the 205 disc diameter to soak up the heat. Only
use cable operated style. I have seen the plastic line on a hydraulic system melt off from the
heat and almost turn into a fatality. Almost lost

a

Quoted message said:

good friend to something I built. Rim brakes are a form of disc brakes, so the heat goes into
the tire,

which can

Quoted message said:

cause a blow-out. I have seen several accidents cause from this. All on

long

Quoted message said:

downhills. Speedy

Wolverbob said:

I am thinking of installing a new rear wheel on my Ryan Duplex with a

disc

Quoted message said:

Quoted message said:

brake. My big question is how does the brake caliper mount on the frame?

In

Quoted message said:

Quoted message said:

some cases, are new attachement points needed to be welded on? Thanks in advance for any advice.

Bob Krzewinski

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Newsgroup Service in the World! -----== Over 80,000 Newsgroups - 16 Different Servers! =-----

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