Aiming for sub 10lbs. Sram Red, DASH hubs THM Update 20/5/11

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jhpbk
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Joined: Wed Jan 13, 2010 9:18 pm

by jhpbk

Thanks for the comments. The hubs are pretty wicked!

The plan is a Ruegamer, i am getting closer to getting one, hopefully just need to finalise the details.

It will be posted on here if it arrives anyway,

Cheers
Josh..

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djconnel
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by djconnel

Ruegamer?

2011 WW BOTY is now a lock.

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USofChay
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Joined: Tue May 25, 2010 11:24 pm

by USofChay

Great start to the build. Why don't more companies drill out the freehub?

x43x
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Joined: Wed Oct 11, 2006 12:43 am

by x43x

I want those hubs! I wonder if its too late to change...

jhpbk
Posts: 147
Joined: Wed Jan 13, 2010 9:18 pm

by jhpbk

Evening.

A few new bits in the post today, and a bit I have been working on.

First up
Ciamillo 0G Ti brake set. Pictured below. Weigh in at 163.8grams, including the pad holders.
Not 100% sure if i will use these for the final build as yet. I might go full throttle and go AX Lightness. But these are a good start.
Image

Next Up -
One of the things i am trying to do with this build, is tune/customise some parts myself, to make them as light as possible. I have already done the SRAM Red rear mech, and now it was time for the shifters.
This is just the first attempt, they still need final sanding and finishing. But it gives an idea of the final product. They are stock STI Levers, with BTP carbon clamps and hoods.
The original lever weighed in at 152.2grams. Mine comes in at 122.4 grams.
Image
Image

Cheers
Josh..

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devinci
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by devinci

wow, cool tuning going on here.

Do you think the slots in the brake lever will make noise when the wind hit them at high speed? Also, do you think the slots in the shift paddle will weaken it?

jhpbk
Posts: 147
Joined: Wed Jan 13, 2010 9:18 pm

by jhpbk

Devinci..

The only I can give to both questions is.... Yes, they probably will.

But, there is only one way to find out. The slots hopefully wont weaken the carbon to much, this isn't the most scientific of tests. But, trying to flex the paddle by hand, there is little or no movement on the material.
Looking at the way I shift, there doesn't seem to be any reason for a massive amount of force to go onto that lever anyway, but only time will tell.

Good point about the wind though. That hadn't even crossed my mind, will have to weight and see what happens.

Cheers
Josh..

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djconnel
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by djconnel

Sound travels @ 330 meters/second. So if there was an acoustic resonator with length = 3.3 mm (the approximate width of those slots, choosing a value to keep it simple) the round-trip travel time for sound across that gap would be 20 µsec. This corresponds to a frequency of 500 kHz, well above the ear's threshold. So those slots won't produce an audible signal.

jhpbk
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by jhpbk

djconnel

Thank you for that. That is definitely more scientific than my bending method to test the strength.

Josh..

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devinci
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by devinci

djconnel wrote:Sound travels @ 330 meters/second. So if there was an acoustic resonator with length = 3.3 mm (the approximate width of those slots, choosing a value to keep it simple) the round-trip travel time for sound across that gap would be 20 µsec. This corresponds to a frequency of 500 kHz, well above the ear's threshold. So those slots won't produce an audible signal.


I guess the equation is right, but my cockpit did produce a whistling sound when there was some head wind, thats why I asked.

Dalai
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Joined: Wed Dec 15, 2004 10:54 am
Location: Melbourne, Australia

by Dalai

Enjoying this thread :thumbup:

Not only for the impressive hubs already displayed but also the customising too!

Darksid3
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Joined: Mon Nov 22, 2010 4:45 pm

by Darksid3

:beerchug:

gumgardner
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Location: Pittsburgh

by gumgardner

What's your weight? Those hubs are too light for my size ,75kg. :(

jhpbk
Posts: 147
Joined: Wed Jan 13, 2010 9:18 pm

by jhpbk

Thanks for all the comments, i am defiantely enjoying the project as well.

gumgardner

What's your weight? Those hubs are too light for my size ,75kg.


I am 18, and come in at 58kg. So i am safe i think..

Josh...

Raxel
Posts: 1039
Joined: Wed Feb 27, 2008 3:41 pm

by Raxel

I think 10lbs is a reasonable goal if you have light enough frame (<800gr) and light enough wheelset (1.25 or AX+dash hub plus sapim superspoke may make a sub-700gr wheelset) and you are willing to put 110gr track tires. But building a RIDABLE sub-10lbs bike is much harder.

How much weight have you shed by sanding and drilling red lever?
And I think you'd better use lighter brake options than rather heavy (for 10lbs bike, I mean) zero-G.

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