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 Post subject: Re: Show me Your Tuning!
PostPosted: Tue Sep 02, 2014 11:17 am 
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Joined: Tue Apr 09, 2013 5:17 am
Posts: 5
andreszucs wrote:
Hum....2:1 pulley system? 1/2 the force needed to brake? ...righ! More cable to pull...I'm curious to find out how it feels.
Image

Now I am certainly no physicist (in fact I'm a little mathematically challenged) but won't that only change the speed that the pads travel in towards the rim, not actually give you more power? You would also need to increase the lever to get more power would you not? As far as I can see the actual force delivered would still be proportionate to the power traveling from the rider's hands through the lever and down the cable..

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 Post subject: Re: Show me Your Tuning!
Posted: Tue Sep 02, 2014 11:17 am 


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 Post subject: Re: Show me Your Tuning!
PostPosted: Tue Sep 02, 2014 12:15 pm 
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Joined: Wed Jul 13, 2005 10:51 am
Posts: 1031
Location: Sydney, Australia
It is changing the "lever". A lever is created any time a force acts a distance from a pivot - the bearing here will increase the distance from a pivot to where the cable anchors.

Crap description. :s

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 Post subject: Re: Show me Your Tuning!
PostPosted: Tue Sep 02, 2014 2:58 pm 
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Joined: Wed Feb 09, 2005 4:51 am
Posts: 1710
Christo, if you understand the principles behind block and tackle pulleys, you'll get what he's trying to do here.

The loop back up to the arm for an anchoring point effectively doubles the cable pull required for each amount of arm movement. It also effectively doubles the force actuated on the pulley pivot, in effect the brake arm.

How well it works remains to be seen but in principle, that's what its supposed to do.


Last edited by maxxevv on Tue Sep 02, 2014 3:26 pm, edited 1 time in total.

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 Post subject: Re: Show me Your Tuning!
PostPosted: Tue Sep 02, 2014 3:01 pm 
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Posts: 282
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Last edited by andreszucs on Thu Sep 11, 2014 10:10 pm, edited 1 time in total.

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 Post subject: Re: Show me Your Tuning!
PostPosted: Wed Sep 03, 2014 5:06 pm 
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Posts: 282
Does anyone know or seen any Rupture test on Brake and Shift cables? I'd like the see the numbers. Can't find so far.


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 Post subject: Re: Show me Your Tuning!
PostPosted: Wed Sep 03, 2014 8:20 pm 
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Posts: 282
Sram clamps (for trigger shifters) working as an adapter to install the rear shifter from the frame to the handlebar. Looks good!Image


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 Post subject: Re: Show me Your Tuning!
PostPosted: Wed Sep 03, 2014 8:51 pm 
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Joined: Thu Mar 07, 2013 5:31 pm
Posts: 15
hmm, care to explain how you did that? I made a retroshift style from a 1X7 cheap bike, but yours solution looks nice too:

Image


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 Post subject: Show me Your Tuning!
PostPosted: Wed Sep 03, 2014 9:22 pm 
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mvotre wrote:
hmm, care to explain how you did that? I made a retroshift style from a 1X7 cheap bike, but yours solution looks nice too:

Image


Yours looks also interesting, but were the cable stop goes?

I don't mind explaining....well, the picture tells the story:
Sram clamp is already square, but I had to use a file to remove some material to fit the shifter base, as you see, fitting worked. The second part you see (from left to right)
is a caliper brake Nut, and I also used a file to make the square shape to avoid rotation versus the sram clamp. The other edge of the nut is also squared to receive the
shifter and fit properly. A 33mm long bolt was needed, and lastly, M5 nut closing the deal. The second clamp is needed to work as a cable stop, they need to work together.
Image


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 Post subject: Re: Show me Your Tuning!
PostPosted: Fri Sep 05, 2014 7:10 am 
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Last edited by andreszucs on Thu Sep 11, 2014 10:08 pm, edited 1 time in total.

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 Post subject: Re: Show me Your Tuning!
PostPosted: Fri Sep 05, 2014 2:58 pm 
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Joined: Sun Jan 03, 2010 4:58 am
Posts: 474
Wow, the pictures are so big it's a pain to follow this thread.


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 Post subject: Re: Show me Your Tuning!
PostPosted: Sun Sep 07, 2014 3:39 am 
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Saddle ready
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 Post subject: Re: Show me Your Tuning!
PostPosted: Mon Sep 08, 2014 11:28 am 
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Joined: Mon Aug 15, 2011 4:48 am
Posts: 410
Wow! That looks fantastic! Kudos on the shifter too, raw engineering look. Very cool!

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