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 Post subject: Re: Show me Your Tuning!
PostPosted: Tue Sep 02, 2014 11:17 am 
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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: 1044
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: 1719
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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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: 288
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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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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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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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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Posts: 411
Wow! That looks fantastic! Kudos on the shifter too, raw engineering look. Very cool!

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 Post subject: Re: Show me Your Tuning!
PostPosted: Mon Sep 29, 2014 2:05 am 
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Joined: Tue Apr 22, 2014 2:17 am
Posts: 19
Here I have my lightweight junior cassette mod...
This started out as a 14-25 10speed ultegra cassette, but i wanted to have the option of a 27, so in our parts bin at the shop, i found a dura-ace 7900 12-27 cassette. Swapped the last 3 cogs from the dura-ace cassette onto the 14t junior legal corncob, giving us the following;
Image20140928_202342 by greenberg.ethan, on Flickr

But that sucka is heavy! So, I took the primary grouping which is riveted together, got out my drill, and separated the cogs. Used the 1st position 14t from the corncob, the 15t and 16t from the dura-ace, a custom bit i loaded onto the dura-ace carriage, which gives me my 17t and 18t cogs. Then the 19t and 20t from the original corncob, and then my last 3 dura-ace cogs (21, 24, 27 on a carriage). I also replaced all of the spacers with some composite ones. Pretty happy with the end result;
Image20140928_202443 by greenberg.ethan, on Flickr

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 Post subject: Re: Show me Your Tuning!
PostPosted: Mon Sep 29, 2014 2:11 am 
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Posts: 1719
Just a reminder not to use it on an aluminium freehub though. Its gonna bite real deep , maybe even through with individual cogs.


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 Post subject: Re: Show me Your Tuning!
PostPosted: Mon Sep 29, 2014 2:18 am 
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maxxevv wrote:
Just a reminder not to use it on an aluminium freehub though. Its gonna bite real deep , maybe even through with individual cogs.

Holy moly dude, thanks for letting me know. Luckily, the DA 9000 wheelset has a TI freehub body. That's ok right?

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 Post subject: Re: Show me Your Tuning!
Posted: Mon Sep 29, 2014 2:18 am 


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