2012/06/19

Hollowgram SISL²



Damn! 484 grams for the crankarms, SpideRing, spindle and bolts! Stiffer than the current Hollowgram SL with normal chainrings bolted to a separate spider on top of that.



The obvious change is the SpideRing, a one piece 3D forged then machined spider and rings combo. Available in compact 34/50 or standard 39/53, optimized for 10 or 11 speed transmissions.



The arms are still 100% machined in two halves that are bonded together but they also get a bit lighter (obvious is the shaping near the spindle that follows the BB30 spline shape) but it also gets stronger/stiffer. Not shown is the new spindle, also trimming some material and also getting stiffer.

Too bad it wont be here in time for my new bike project, I'll have to endure the current Hollowgram SL...

Also a good news, there is a new cheaper version of the Hollowgram with 3D forged arms to reduce the price. These will mostly make their way on middle range bikes instead of crappier cranksets from FSA.

8 comments:

Michael said...

Dan,

Any idea how much of an upgrade in terms of stiffness and weight the new Hollowgram is over the old Hollowgram SI (not the SISL)?

What is the stiffness and weight on the 3D forged version supposed to be like vs the SI version?

I'm running the Hollowgram SI (with o.symetric rings for TTs) on my caad10. Could I run the detachable spider from the old Hollowgram with this crankset so that I could continue to use non-Cannondale rings?

Thanks!

Dan Gerous said...

Hard to tell since the new model has just been announced. Until we get to try and play with one, all we have are the claims from Cannondale.

Of course, a one piece spider and ring combo can easily be stiffer than a spider, rings and bolts combo if well designed. In that regard, I'd trust Cannondale.

The SISL² arms are supposedly 15gr lighter than SL arms. The spindles is supposed to be a few grams lighter too.

The new cheaper 3D forged has the same weight as the original Hollowgram (a bit heavier than the SL) but stiffer.

As for mix and matching, everything can be as the spider's spline and lockrings are all compatible. So any spider (old original Hollowgram, Hollowgram SL, compact, regular, Campy specific, SRM, TT aero spider and the new SpideRing* can all be used on any Hollowgram variation. So you'll be able to use a spider for any chainrings you like on the new SISL² or 3D forged arms or put the new one piece SpideRing on an old Hollowgram.

Anonymous said...

This system has existed since 2009, the first plateau monolithic system is the “OMC-ITALIA”, an Italian company

http://www.omc-italia.com


OMC-ITALIA also has a page on facebook

http://www.facebook.com/pages/OMC-ITALIA/246638164815?ref=ts

Dan Gerous said...

Yes, integrated parts are not new, but the father of all integrated cranksets is still from Cannondale. The old Coda crankset from the 90's had all three chainrings and the BB spindle interface machined as one part, the arm was bolted to that...

Anonymous said...

The old coda cranckset is for the old bottom bracket with the square spindle , look omc-italia and the new sisl2 , they are most like

Anonymous said...

Old coda aren't as one part ...

http://i902.photobucket.com/albums/ac227/shiprick/P1000414.jpg

Dan Gerous said...

That's not the Coda crank model I was referring to... I was talking about this one:

http://www.retrobike.co.uk/forum/files/bitsforsale004_298_985.jpg

Anonymous said...

always square spindle ...