Cantilever brakes ..... HELP !!!

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landsurfer
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Cantilever brakes ..... HELP !!!

Postby landsurfer » 13 Sep 2019, 8:07pm

Tuesday this week i decended Whinlatter pass.
With a group of like minded friends ..
P went down the hill without the use of his brakes .. really .. it's on Strava ...
I went down deciding which car i would crash into at 20 mph ..
To stop me ......
My cantilever brakes would not stop me .... AT ALL .

Why can i not get my super simple Tektro Canti's to work ?

Which pads? Rim to pad clearance ?

Or ..

Are Canti brakes simply unable to stop 100kg @ 39.1 mph in 30 meters .... ??
It's just like that, it's just the way it is.
The road goes on forever.

fatboy
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Joined: 5 Jan 2007, 1:32pm
Location: North Hertfordshire

Re: Cantilever brakes ..... HELP !!!

Postby fatboy » 13 Sep 2019, 8:09pm

What sort of cantis? What sort of levers? I have cantis on the rear of two bikes and find them good. I use mini vees on the front as the light mount is easier.

To make them work the usual suspects are cables and blocks. Was it raining?
"Marriage is a wonderful invention; but then again so is the bicycle puncture repair kit." - Billy Connolly


reohn2
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Joined: 26 Jun 2009, 8:21pm

Re: Cantilever brakes ..... HELP !!!

Postby reohn2 » 13 Sep 2019, 8:29pm

robgul wrote:Ditch the cantis - get Vee brakes.

Rob

+1
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I cycle therefore I am.

djnotts
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Joined: 26 May 2008, 12:51pm
Location: Nottingham

Re: Cantilever brakes ..... HELP !!!

Postby djnotts » 13 Sep 2019, 8:53pm

reohn2 wrote:
robgul wrote:Ditch the cantis - get Vee brakes.

Rob

+1


+ another. Simply never good enough to justify the effort of getting the "best" out of 'em.

landsurfer
Posts: 4996
Joined: 27 Oct 2012, 9:13pm
Location: Rotherham

Re: Cantilever brakes ..... HELP !!!

Postby landsurfer » 13 Sep 2019, 8:54pm

My bike is based on a Jamis Aurora ..... which V brakes would you recommend ?
That fits on the stock forks ...
And why does a braking system that is held to be ineffective by it's users, still in production .. ?
There must be liability issue here ... ?
It's just like that, it's just the way it is.
The road goes on forever.

slowster
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Joined: 7 Jul 2017, 10:37am

Re: Cantilever brakes ..... HELP !!!

Postby slowster » 13 Sep 2019, 8:59pm

landsurfer wrote:Why can i not get my super simple Tektro Canti's to work ?

Which pads? Rim to pad clearance ?

If you want advice on whether the performance of the brakes as currently set up can be improved, then I suggest you post photographs of the brakes, and state what the current pads are.

Brucey
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Joined: 4 Jan 2012, 6:25pm

Re: Cantilever brakes ..... HELP !!!

Postby Brucey » 13 Sep 2019, 9:02pm

tell us more about your levers, brakes, and show us photos of your setup.

Cantis are not bad brakes per se, but they are sensitive to setup; they are a more, uh, subtle brake than some others.

If you are using STIs (which like their namesake some might regard as 'a modern disease' ahem) then probably you won't want to stomach buying different ones just to fit a different brake. STIs vary in brake lever MA, so different STIs suit different brakes.

There are predictable cries of 'ooh you should fit Vee brakes' and this advice might be good, might be a good way to waste your money. If you do fit Vee brakes you will probably fit new cables and brake blocks too. Ironically this might be all that is wrong with your cantis right now.... :roll:

cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~

landsurfer
Posts: 4996
Joined: 27 Oct 2012, 9:13pm
Location: Rotherham

Re: Cantilever brakes ..... HELP !!!

Postby landsurfer » 13 Sep 2019, 9:06pm

Tektro 992 forged alloy cantilevers.

And to be honest ... before the decent of Whinlatter Pass they where a fear free braking system ....

P, suggested the problem was not the brakes stopping efficiency but my insistence on using brakes ..... !!!

The next day V suggested that using brakes on a downhill that you have just climbed up was daft .. why climb then brake on the down hill ?!?!?

She was quite vocal on this issue .....

And possibly quite right ...

If i had the confidence to just freewheel down Whinlatter my journey would have so much stress free ......

??
It's just like that, it's just the way it is.
The road goes on forever.

Brucey
Posts: 35946
Joined: 4 Jan 2012, 6:25pm

Re: Cantilever brakes ..... HELP !!!

Postby Brucey » 13 Sep 2019, 9:18pm

Tektro 992, AKA Tektro 'oryx'

Image


levers?

setup?

Before the inevitable cries of 'those brakes are crap' I would just like to mention that 'those brakes' can vary at least a factor of two in power depending on how they are set up, what levers are used, etc.

cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~

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horizon
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Location: Cornwall

Re: Cantilever brakes ..... HELP !!!

Postby horizon » 13 Sep 2019, 9:35pm

landsurfer wrote:My cantilever brakes would not stop me .... AT ALL .



Can you qualify that? (as in, "they were pretty poor but did eventually stop the bike" etc). 100 kg at 40 mph down a very long steep hill in the rain might be a challenge for cantis but my guess is that there is/was an issue with the rims or the cables/blocks or the set up etc. I'm not saying that Vs or discs wouldn't have done better (and I'm no expert) but the laws of physics tell me that dry rubber blocks in good condition held tightly onto the rims of both wheels would actually have stopped you.
Let's just get Brexit done so that we can get on with the important job of re-joining the EU!

landsurfer
Posts: 4996
Joined: 27 Oct 2012, 9:13pm
Location: Rotherham

Re: Cantilever brakes ..... HELP !!!

Postby landsurfer » 13 Sep 2019, 9:46pm

horizon wrote:
landsurfer wrote:My cantilever brakes would not stop me .... AT ALL .



Can you qualify that? (as in, "they were pretty poor but did eventually stop the bike" etc). 100 kg at 40 mph down a very long steep hill in the rain might be a challenge for cantis but my guess is that there is/was an issue with the rims or the cables/blocks or the set up etc. I'm not saying that Vs or discs wouldn't have done better (and I'm no expert) but the laws of physics tell me that dry rubber blocks in good condition held tightly onto the rims of both wheels would actually have stopped you.


They didn't ... see the original post ..... thats the issue ...... Dry, warm, tarmac ..... retardation, but unable to stop .....Squealing .... lots of squealing .. The reduction in speed / forward motion was inadequate .. to preserve life ... alledgley ...
It's just like that, it's just the way it is.
The road goes on forever.

Brucey
Posts: 35946
Joined: 4 Jan 2012, 6:25pm

Re: Cantilever brakes ..... HELP !!!

Postby Brucey » 13 Sep 2019, 9:48pm

lever?
brake blocks?
setup?
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fatboy
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Joined: 5 Jan 2007, 1:32pm
Location: North Hertfordshire

Re: Cantilever brakes ..... HELP !!!

Postby fatboy » 13 Sep 2019, 9:50pm

Brucey wrote:Tektro 992, AKA Tektro 'oryx'

Image


levers?

setup?

Before the inevitable cries of 'those brakes are crap' I would just like to mention that 'those brakes' can vary at least a factor of two in power depending on how they are set up, what levers are used, etc.

cheers


Should be able to make them work, I've got them on a couple of bikes and with good cables and pads (stock pads can be rubbish, koolstops better) they can work. If you want to change to vees you'll need new levers.
"Marriage is a wonderful invention; but then again so is the bicycle puncture repair kit." - Billy Connolly

PH
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Re: Cantilever brakes ..... HELP !!!

Postby PH » 13 Sep 2019, 9:54pm

landsurfer wrote:
Are Canti brakes simply unable to stop 100kg @ 39.1 mph in 30 meters .... ??

As a 100 kg rider whose bikes have Vs, cantis, mech disks and hydraulic discs, I wouldn’t trust any of them to do that, I would trust all of them to slow the bike before that need arose. There’s a few roads where in the right conditions I’ll let it gain those sorts of speeds, but it wouldn’t be where I needed to stop in that distance. I’m currently in the Picos where some of the hills make Winllaters look like a gentle slope, my BB7’s are doing fine, though so are the Vs, cantis and DP callipers on some other bikes in the group.