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Just starting to plan a weight weenie bike for myself so I'll tune in regularly. (Full disclosure...I work for Cervelo's engineering group but any opinions are solely my own!)
I've just bought a R5 and was wondering how straightforward it was to fit the VumaQuad crank? Did you have to use the SRAM/Rotor BB and spacers etc. that came with the frame or does Zipp produce a specific BBright BB? No-one over here in Oz seems to know and the Cervelo website isn't very clear.
Those frames feel like they're going to float away in your hands!
I have ordered an Ax Lightness premium no setback seatpost, will see if that will fit. I will want the seatpost to secure to the carbon wrap on the saddle rails. It looks like it will be close but might work.
I have ordered a couple of headset to try out. The AER headset is not for me. It may be lighter than air but is not really suited to my kind of riding. It is very finicky. The norglide easily gets off track. Not a problem, the headset is a standard size and I will try out some light headsets with bearings. Maybe the FSA Orbit IS or another Cane Creek, I have ordered both.
I rotated the handlebar up a little and will move the shifters forward on the handlebar. The stem will be lowered a little. Once I get comfortable I will cut the fork tube down some more.
Cane Creek sent me one of the first Aer headsets and I never had issues with them. --> http://weightweenies.starbike.com/forum/viewtopic.php?f=3&t=61381sedluk wrote:The AER headset is not for me. It may be lighter than air but is not really suited to my kind of riding. It is very finicky.
Now I got both the Aer ZS and the Aer IS. Once a NorGlide bushing was worn out and subsequently replaced. I'm so pleased with this product that I'll use the Aer on my next bike too.
I'm not exactly easy on my stuff. Back in '08 I got myself a pair of VumaQuad cranks whose spline interface I ruined relatively quickly into service life. I think it took mere months. They developed excess play in the arm interface that basically rendered them useless, even though they were otherwise intact. They correctly installed but since the failure I never touched them again. I ended up donating them to a friend as they never worked properly for me.
It's like the saying... different strokes for different folks.
Parlee Z5 XL (6055g/13.32lbs) Trek Madone 5.9 (7052-7500g)Jonesman Columbus Spirit (8680g)
Chase your dreams - it's only impossible until it's done
It appears the intercept is 1 cm ahead of the BB center.
So the effective seat tube angle is:
STA = arccos [ cos 72° ‒ 1 cm / L' ]
where L' is the distance from the top of the saddle to the height of the BB center along the seat tube.
The derivative of arccos = ‒ 1 / sin, so I can approximate that as:
STA = 72° + [ 1 cm / ( L' sin 72° ) ] 180° / π
= 72° + 60.2° cm / L'
So if L = 73 cm, for example:
STA = 72.8°
So it wouldn't be that different from the R5, actually.
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