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PostPosted: Thu Nov 17, 2016 10:31 am 
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Joined: Tue Apr 09, 2013 1:45 pm
Posts: 93
Recently I have bought SiSl2 crank arms to replace my current SI arms on my 2014 HM Synapse.

Well... I am bit disappointed. Before my purchase I have read that both arms weight around 250g (122g for non drive side , and ~128g for Drive side arm). Also some people claimed it on this forum. I also saw some pictures of arms put on scale from r2-bike:
Image
Image

Today I received mine 172.5mm SiSL2 arms and they weigh:

DS: 137g (without lockring)
NDS: 131g

Image
Image

Is it normal...? I wonder these weight differences. Are there any revisions of these arms? Older/newer? I hoped for saving around 80g with sisl2 arms. Now it looks like it will be around 60... :?


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Posted: Thu Nov 17, 2016 10:31 am 


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PostPosted: Thu Nov 17, 2016 4:14 pm 
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Location: Downtown Los Angeles, CA
Mine that I just took receipt of are 257g for the pair, however, they're 165mm.

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The Ex's. LS Siena: 6.21kg | Parlee Z5 SLi: 5.9kg | LS Xicon: 5.76kg | C59: 5.7kg | Cervelo R5ca: 5.09kg | Fuji Altamira SE - 6.2kg | Scott Foil - 6.2kg | Evo - 5.18kg | LS Classic - 6.7kg


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PostPosted: Fri Nov 18, 2016 10:36 am 
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Mine are 261g for the pair, 172.5 length too. Not sure where your extra 6g came for but this does seem a reasonable manufacturing variance. The real weight saving on this system is the chainrings and spindle


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PostPosted: Fri Nov 18, 2016 5:27 pm 
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Joined: Sun Oct 05, 2014 11:51 pm
Posts: 1238
didn't know that the arms could be bought separately? Anyone have a link?


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PostPosted: Fri Nov 18, 2016 5:48 pm 
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Joined: Tue Apr 09, 2013 1:45 pm
Posts: 93
jeffy wrote:
didn't know that the arms could be bought separately? Anyone have a link?
of course You can. I.e Check Westbrook cycling, r2 bike, cannondale experts, cannondale de, cannondalespares.
Also Check ebay for best deals.


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PostPosted: Fri Nov 18, 2016 8:12 pm 
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Joined: Mon Apr 28, 2014 4:36 pm
Posts: 70
Location: Vancouver, BC
My 172.5mm NDS SiSL2 arm weighed 129g (removed for stages). Have never weighed the drive side one.


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PostPosted: Fri Nov 18, 2016 9:55 pm 
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Location: Downtown Los Angeles, CA
Stage21 in California is the cheapest for new in the US

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Strava
Current Stable. The Snob Machine | The Crumpton
The Ex's. LS Siena: 6.21kg | Parlee Z5 SLi: 5.9kg | LS Xicon: 5.76kg | C59: 5.7kg | Cervelo R5ca: 5.09kg | Fuji Altamira SE - 6.2kg | Scott Foil - 6.2kg | Evo - 5.18kg | LS Classic - 6.7kg


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PostPosted: Sat Dec 10, 2016 8:42 pm 
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Joined: Sat Dec 10, 2016 7:18 pm
Posts: 11
I received mine 172,5mm Hollowgram SiSL2 arms and they weigh:
DS: 137g (without lockring) 140g (with lockring)
NDS: 130g
Spidering: SL 52x36 171g
together: 441g

mine 172,5 Hollowgram Si with 8 arm Spidering 52x36 : 547g

106 g difference is fine :)


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PostPosted: Sun Dec 11, 2016 7:00 pm 
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Joined: Thu Jan 01, 2009 3:05 am
Posts: 100
My 175's are 124/128 the latest regular si version I have are 168/172


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PostPosted: Wed Dec 14, 2016 10:09 pm 
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Posts: 138
Location: ITALY
KC wrote:
My 175's are 124/128 the latest regular si version I have are 168/172


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Your 175 cranks are very light!

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PostPosted: Thu Dec 15, 2016 4:50 am 
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Posts: 100
That's for the sisl2's. 484 was the total with 34/50 spiderings and bottom bracket


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PostPosted: Thu Dec 15, 2016 9:47 am 
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Joined: Tue Apr 09, 2013 1:45 pm
Posts: 93
I wonder if the weight differences are because of reported arms cracking issues.

Maybe they were lighten too much and decided to put more material on them. ~15g penalty according to first batch of sisl2. But this are only my guesses


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PostPosted: Thu Dec 15, 2016 2:18 pm 
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Joined: Thu Jan 01, 2009 3:05 am
Posts: 100
I'm not sure but I have been dealing with the cannondale bonded cranks since 1992 and I have never heard of an issue of them breaking in any way. I have personally had two carbon cranks break where the pedals attach to the crank. Has anybody ever seen a broken Hollowgram?


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PostPosted: Fri Dec 16, 2016 3:13 am 
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Joined: Wed Sep 14, 2016 8:51 pm
Posts: 469
Location: RVA,USA
I've heard of it on the web. I was warned by my lbs if I was looking at sisl2 arms, only to use them for a season. He said he has heard of them snapping in half.
try :google:

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Posted: Fri Dec 16, 2016 3:13 am 


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PostPosted: Fri Dec 16, 2016 4:08 pm 
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Joined: Thu Mar 28, 2013 4:42 pm
Posts: 839
Location: Pa USA
viewtopic.php?f=3&t=140966&hilit=hollowgram+crack


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