Cannondale SiSl2 Crank Arms - weight differences

Discuss light weight issues concerning road bikes & parts.
nonamed
Posts: 96
Joined: Tue Apr 09, 2013 1:45 pm

by nonamed

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... :?

RyanH
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Location: Los Angeles, CA
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by RyanH

Mine that I just took receipt of are 257g for the pair, however, they're 165mm.
Strava
Current Stable. The Snob Machine
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 | The Crumpton - 5.9kg

sussexhills
Posts: 53
Joined: Fri Nov 18, 2016 10:31 am

by sussexhills

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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jeffy
Posts: 1255
Joined: Sun Oct 05, 2014 11:51 pm

by jeffy

didn't know that the arms could be bought separately? Anyone have a link?

nonamed
Posts: 96
Joined: Tue Apr 09, 2013 1:45 pm

by nonamed

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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wrenegade
Posts: 79
Joined: Mon Apr 28, 2014 4:36 pm
Location: Vancouver, BC

by wrenegade

My 172.5mm NDS SiSL2 arm weighed 129g (removed for stages). Have never weighed the drive side one.

RyanH
Moderator
Posts: 1947
Joined: Tue Jan 17, 2012 4:01 pm
Location: Los Angeles, CA
Contact:

by RyanH

Stage21 in California is the cheapest for new in the US
Strava
Current Stable. The Snob Machine
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 | The Crumpton - 5.9kg

westwood
Posts: 11
Joined: Sat Dec 10, 2016 7:18 pm

by westwood

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 :)

KC
Posts: 101
Joined: Thu Jan 01, 2009 3:05 am

by KC

My 175's are 124/128 the latest regular si version I have are 168/172


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garjo
Posts: 171
Joined: Thu Aug 13, 2015 8:41 pm
Location: ITALY

by garjo

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!
My 4,93 kg Supersix Evo HM: viewtopic.php?f=10&t=137647&start=30

My 6,22 kg Cannondale R500 1996: viewtopic.php?f=10&t=134364

KC
Posts: 101
Joined: Thu Jan 01, 2009 3:05 am

by KC

That's for the sisl2's. 484 was the total with 34/50 spiderings and bottom bracket


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nonamed
Posts: 96
Joined: Tue Apr 09, 2013 1:45 pm

by nonamed

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

KC
Posts: 101
Joined: Thu Jan 01, 2009 3:05 am

by KC

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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evan326
Posts: 480
Joined: Wed Sep 14, 2016 8:51 pm
Location: RVA,USA

by evan326

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:

glepore
Posts: 1100
Joined: Thu Mar 28, 2013 4:42 pm
Location: Pa USA

by glepore

Cysco Ti custom Campy SR mechanical (6.9);Cannondale SS Evo Di2 7970 (5.79); Willier Cento Uno Air Di2 9070 (7.0); C40 Mk2 DA 7800 ; Anvil Custom steel Etap;1996 Colnago Technos Record

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