Choosing a frame (and wheels) that have supior handling will make more of a difference on how the bike feels than weight.
Don't know 'bout 3, but you could get it in the 12s fairly reasonably. $ wise.
Here's a rough list:
Frame '03 Caad7 SI BBQ - 1125gms
SP clamp, Cable guide, RD hanger - ~35gms
Chinese fork, cut - 321grams
headset, homemade expander, bolt & cap and spacer- ~ 60gms
Brakes KCNC CB1s - 170gms
Shifters Rival - ? (-12gms tuned clamps)
FD 7800 31.8 tuned - 65gms
RD Force tuned - 142gms
Bars Ergosum LTDs - 182gms
Seatpost Chinese 0 alloy tuned - 138gms
Saddle Toupe Pro - 136gms
Cassette - 7900 11/28 - 188gms
Skewers KCNC - ~45gms
Chain Sram 1090R - ?
Cables Gore - ?
Tubes Conti SSs - ~105gms
Tires - 4000s/Diamante light - 370gms
This winter I'm planning on buying or building a lighter wheelset. ~13-1350gms, getting i-links and buying a used Red RD to tune. If I get it down to 13.25 i'll be satisfied (famous last words).
1. Chinese carbon 20mm tubular rims 20/24 drilled. 256gr each 230$ a pair
2. A pair of Dati Hubs 260gr for the set 170$ **
3. 44 Sapim C-xray Laser spokes 198gr 1$ each 44$
4. 44 alloy nipples 15.4gr for 17.60$
5. Nipple washers 13.2gr for 6$ (3 packs of 20)
~998.6gr total wheel set for 467.6$ + shipping and you build them.
**You can go cheaper if you get the Ultralight hubs at about 288gr for 119$
If you want the c-xray bladed those are 2.95$ each. which would come to 132$ instead of 44$
As far as number of spokes. Why do you say I need more spokes?
20/24 are common these days if properly built and you don't weight a ton.
I have the rims already they are made by ArcTech they were part of a group buy on this forum.
The parts I listed are the parts I will most likely use.
The rims are labeled and say not to exceed 100kpf of tension. For which I will adhere to.
I will add the nipple washers to spread the load.
In comparison I have re-built a pair of Mavic Helium which have the same rim as the Mavic Reflex.
Mavic calls for a tension for 92 -112 kpf in their documentation. I made them tight at 130 kpf on the rear drive side and 100 kpf on the non-drive side for the rear wheel and the front wheel at about 100 kpf on all spokes (the front is radially laced where as the rear the non drive side is radial and the drive side is 2 cross). I specked my build from another set that was factory built so Mavic actually went with a lower tension in their documentation. I used a Park tool tension meter to check the tension on all spokes
The tension of 100 kfp should be stiff enough for a rider my weight 150-160 lb.
The lacing pattern will be the same as the Mavic Helium described above.
The spokes I might go with sapim c-xray instead of the sapim lasers
As far as braking will will use the Swiss stop pads. The braking surface on these rims seems to be excellent.
The wheels will only be ridden in dry weather.
These wheels will be similar to the Reynolds Koms which I have tested although a hell of a lot cheaper.
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