Cannondale System Six build

Triathlon Forum
1

I have brought on Sale a Cannondale System Six Ultegra to build up for flat crits / road races and road bike TT’s.

I wondered if anyone knows how much of the bikes aero performance is down to the Knot bar & stem? I ride 36cm bars & the nearest Knit bar width in 38’s seem hard to find (I did find some compatible Save bars in a 36 but don’t know how different they are). For now I have a Deda Vinci stem & cover with some 36cm prime aerobars to fit. But if the Knots are worth it aerodynamically I will look out for a stem and bars closer to my fit.

I have decided to pull across some 11spd Di2 parts from a TT bike build. Does anyone have an idea of what di2 cable lengths I would need for a size 51? I would like to order some before the bike arrives - I have a y spliter (m/m) for the Lever routing (on order) (& the 3 junctions/connectors - downtube, connector & b junction). So think I need 1x cable between the y spliter/ connector to junction box, 1 x downtube junction to b junction, 1x b junction to battery, & one b junction to rear mech. Any ideas of lengths needed greatly received otherwise I will wait until I get the bike & use the string method.

Also I wondered if anyone knows the frameset weight difference between this standard model & the Hi mod. I have only seen the hi mod weights given. Hoping that the smaller size of the 51 reduces the weight penalty of the heavier lay-up.
Cheers T

2

I can’t imagine the stem makes much of a difference aerodynamically. And if you put a bar on that’s got an aero profile then the narrower width will make it faster than the wider knot bar (bar itself will be marginally fast but main thing is you should have less drag with your hands/arms closer.

3

I have a 2019 system six non-himod with SRAM etap and knot bar/stem. Not sure about the weight, but will say it is a fast bike. Corners on a rail and acceleration is quick. It will make a great crit bike.

4

I sort of feel that with the bar width. Currently racing Sam Oomens old R5 Sunweb bike. Not the most aero frame but with the 36’s a longish stem and a little help from a Tririg front brake I think the package is quite aero due to the position.

It does seem the 38bar Knot is actually 36 at the hoods but I will see how I get on with Deda stem snd Prime bars.