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PostPosted: Tue Sep 19, 2017 12:31 pm 
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Couldn't resist...
Image
That's the total weight including 3D printed titanium DS + NDS arms and alu axle, 130BCD spider with 36T inner ring and clamping mechanism but without BB bearings, chainring bolts or a big ring.

The production version will be gain about 10-15 grams or so, and the wait is now for new printed arms with a slight redesign. The final issue remaining is some finetuning of the production process before releasing them into the wild. Separate spiders will also be available.

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Posted: Tue Sep 19, 2017 12:31 pm 


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PostPosted: Tue Sep 19, 2017 12:46 pm 
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Joined: Tue Mar 13, 2012 7:27 pm
Posts: 143
Hard to beat the grams to dollars of an s-works. A really good used one -- no axle wear -- is a huge bargain in the world of light cranks and will last forever. I favor the scratched up ones. Quick sanding and a bit of clear coat and its nearly good as new for a pittance,


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PostPosted: Tue Sep 19, 2017 10:04 pm 
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Joined: Wed Sep 12, 2012 9:00 pm
Posts: 579
Location: Az USA
mythical wrote:
Couldn't resist...
Image
That's the total weight including 3D printed titanium DS + NDS arms and alu axle, 130BCD spider with 36T inner ring and clamping mechanism but without BB bearings, chainring bolts or a big ring.

The production version will be gain about 10-15 grams or so, and the wait is now for new printed arms with a slight redesign. The final issue remaining is some finetuning of the production process before releasing them into the wild. Separate spiders will also be available.


I was waiting for someone to come out with a light weight 3D printed Ti crankset, just seems like a great use for 3D printing. You can build up some internal structure to make it light and stiff, I imagine price will be $$$$$ though


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PostPosted: Tue Sep 19, 2017 10:27 pm 
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Joined: Tue Mar 13, 2012 7:27 pm
Posts: 143
alcatraz wrote:
A user did a comparison and here are the findings:

2010 or 2011 Specialized crank - 175mm / 52/36 - comes with alloy spider
- 556g for complete crankset
- 149g for Left Arm
- 237g for Right Arm + Alu Spider
- 34g for 36t chainring
- 116g for 52t chainring


2011 S-works crank - 172.5 50/34 - comes with carbon spider
- 520g for complete crankset
- 152g for Left Arm
- 223g for Right Arm w/Carbon Spider
- 30g for 34t chainring
- 99g for 'S-works' 50t chainring

It appears the difference is in the spider. None of these two weigh over 400gr though. I suspect newer models have been beefed up compared to the old ones. Good for people like me though that like to save a buck and buy older stuff.

/a



I did same comparison between a pro-level one with alloy spider and an s-works one and then removed the spiders and weighed the bits separately. I can't remember the difference in spider weight, maybe 20-30 grams, but... that WAS the sole difference. They weren't identical otherwise but so close that it was manufacturing margins, logo etc... like, @12 grams.


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PostPosted: Wed Sep 20, 2017 12:00 am 
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Joined: Mon Aug 29, 2016 11:19 am
Posts: 405
What about crank lengths? Maybe thats where the difference was.

I'm looking solely for 170mm cranks.

/a


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PostPosted: Wed Sep 20, 2017 5:58 am 
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Posts: 8508
Location: Los Feliz, Los Angeles, California
mythical wrote:
Couldn't resist...

That's the total weight including 3D printed titanium DS + NDS arms and alu axle, 130BCD spider with 36T inner ring and clamping mechanism but without BB bearings, chainring bolts or a big ring.

The production version will be gain about 10-15 grams or so, and the wait is now for new printed arms with a slight redesign. The final issue remaining is some finetuning of the production process before releasing them into the wild. Separate spiders will also be available.


Any chance you'll have this for BBRight, 172.5, 110BCD ?

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PostPosted: Wed Sep 20, 2017 8:44 pm 
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Location: Europe
All of the above, except it won't be compatible with Trek's annoying BB90 drop-in bearing shell.
BB standards it does support: BSA, ITA, BB30, BB30A, BB386Evo, BBright and BB86 (did I forget any?)

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PostPosted: Wed Sep 20, 2017 9:52 pm 
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Posts: 223
Threadfit 47 ;)


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PostPosted: Wed Sep 20, 2017 10:19 pm 
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Joined: Wed Sep 12, 2012 9:00 pm
Posts: 579
Location: Az USA
So what’s the ETA and price on this crazy crank?


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PostPosted: Thu Sep 21, 2017 5:04 am 
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Joined: Mon Feb 06, 2006 1:06 am
Posts: 489
Isn't T47 the same as BB30 from a crank compatibility point of view? 30mm spindle, long enough to clear 68mm shell. yes obviously not the same from a frame point of view (threaded).

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PostPosted: Thu Sep 21, 2017 11:10 am 
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Joined: Sat Mar 06, 2010 10:34 pm
Posts: 506
My lightning crank

Non driveside arm-153g
Driveside w/ 110bcd spider- 226
Built with extralite MC rings- 492

30mm spindle w/ a wide spindle. Will fit a standard 68mm bsa shell with their bb.


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PostPosted: Sat Sep 23, 2017 5:50 am 
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Joined: Mon Aug 29, 2016 11:19 am
Posts: 405
nickf wrote:
My lightning crank

Non driveside arm-153g
Driveside w/ 110bcd spider- 226
Built with extralite MC rings- 492

30mm spindle w/ a wide spindle. Will fit a standard 68mm bsa shell with their bb.


Really cool. Can a wide spindle be mounted or does it have to come from the factory?

/a


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PostPosted: Sun Sep 24, 2017 9:18 pm 
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Joined: Fri Feb 08, 2013 4:02 pm
Posts: 2
My Cannondale SISL2 comes in at 496g:
50/34 Spidering: 158g
DS crank/spindle/bolts/lock ring: 213g
NDS crank: 125g


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PostPosted: Mon Sep 25, 2017 9:33 am 
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Joined: Thu Jul 21, 2016 8:21 pm
Posts: 116
My Campy Over Torque:

ImageDSC_0048 by A&D D, on Flickr

A


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Posted: Mon Sep 25, 2017 9:33 am 


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PostPosted: Mon Sep 25, 2017 3:03 pm 
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Posts: 8508
Location: Los Feliz, Los Angeles, California
alistaird wrote:
My Campy Over Torque:


Nice crank. It does not have a removable spider.

alcatraz wrote:
Lightest 30mm crank (bb30 = ok) with removable spider

alcatraz wrote:
This time I'd like a removable spider


:wink:

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