2016 Cannodale SI forged crankarms: downgrade ?

[LouisN]

Like the title says.
Are the 2016 Cannondale SI forged cranksarms a downgrade from the previous ones ?
I saw some 2016 crank arms at dirt cheap prices...

Weight wise ?
NOt compatible with some left leg based Powermeters ...

Anything else I missed ?

Louis

[MisterMuncher]

As far as I can tell, there's now 4 Dale cranks.

The new Si, which is forged, not machined.
The Original Hollowgram Si Crank. These are roughly the same weight, I think, but the new one is cheaper because it's simpler to manufacture.
The SiSL, or SL Hollowgram, which is a machined unit, and lighter than the original Si
The SiSL2, which is lighter again.

As far as I know, arms, spindles, rings and spacers are all compatible with each other.

[boysa]

Ok, I'm confused. So the machined ones are preferable in this case?

[MisterMuncher]

Yes. In this case.

[5DII]

The SL has machined and bonded arms like the SISL2 but with less machining, they were produced from 2008 to 2012. The SI were introduced for the 2013 model years and have 3D-forged one-piece arms so they're cheaper to manufacture but a little heavier. Theoretically, the SISL2 are the stiffest and lightest but other Hollowgrams are all pretty much among the stiffest cranks out there anyway so the main difference is weight but even the heaviest Hollowgram is not considered heavy.

[LouisN]

Thanks for the precision Cannondale experts !!

Louis

[headwind816]

The SI 50/34 172.5 that came on my Racing Red 2104 Evo weighed 611 grams to include FSA rings and 109 spindle and all bolts (no BB stuff).

I ended up replacing it with a RED Exogram 172.5 53/39t that came in at 573 grams