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That's pretty much what we've been saying, except:
- Oldest Hollowgram was Hollowgram Si, not SL. There was no 'Hollowgram SL'.
- The Si chainset is available aftermarket, but he might mean the 165mm Si chainset is an exception and cannot be bought aftermarket.
- there are two versions of the new Si chainset - the Hollowforged (then machined) version and the forged version. The later looks completely different to all other Si cranks, and is basically a plain old forged pair of crankarms that happens to fit the Si axle.
- Oldest Hollowgram was Hollowgram Si, not SL. There was no 'Hollowgram SL'.
Howard
@hippy
FYI from Cannondale Experts:
To clarify: Listed in order of generation.
Hollowgram SL- (Oldest) Used 104mm spindle bottom bracket. Never produced in 165mm or at least never sold aftermarket.
Hollowgram SiSL- (Reduced weight of SL but same 104mm BB and shape) Never sold aftermarket in 165mm.
Hollowgram Si (Newest)- Forged rather than CNC machined construction. Uses 109mm spindle. Crank arms are have different shape to maintain q-factor while chainline moves outboard by 2.5mm. This was made in 165mm. Cannot be purchased aftermarket. Only available on complete bicycles.
Hollowgram SiSL2 (Newest)- CNC machine construction. Uses 109mm spindle. Crank arms are have different shape to maintain q-factor while chainline moves outboard by 2.5mm. This was made in 165mm length and we have this in stock for purchase.
If you use a 109mm spindle on an SL or SiSL crank the q-factor increases by 5mm. If you use the 104mm spindle on Si or SiSL2 cranks you reduce the q-factor by 5mm and chainline by 2.5mm. This may not fit on your frame without contacting the chainstays. You would have to verify you have the clearance.