AscentBikes wrote: ↑Thu Feb 02, 2023 5:43 am
Polaris 42 is about
380g, the Raw rims are about
360-365g or so.
Possible build is:
Polaris 42 Raw x2: 360g x2 = 720g
DT 180: 92 + 188g = 280g
Spokes: CX Ray + Alloy Nipples: (4.5 + 0.3) * 48 = 230.4g
Total Estimate: 1230g-1240g without rim tape
Even with the DT 240s, you'd be around 1260-1270g with the raw rims.
No carbon spokes required. Normal CX Rays - reliable, easily replaceable.
With Carbon-Ti hubs you can save 10 grams vs DT180
With Extralite Hubs you can save 68 grams vs DT180
It would be a nice build but I would be extremely surprised to achieve the same stiffness level. I have seen 100s of lab data and just not possible (like none of the 280 wheels I have plotted are there).
Latest attempt for a stiff wheel I saw was a 410g reinforced (std was 380g) 40mm rim with 28 rear CX-Sprint on Carbon Ti... reaching 46N/mm for 765g (rear).
Pyotrump wrote: ↑Thu Feb 02, 2023 6:37 am
You need to add 20g for rim tapes. Mavic comes without access holes. Acsent may have the same option? IDK...
But adding 20g does not change that Mavic is not competitive anymore. Sad.
To me what they achived is to score top mark in 4 dimensions, weight; inertia, aero and stiffness. Lighter, we can make sub 700g pair of wheels. Look the OneK example, carbon 36mm light rim, carbon spokes, sub 950g... missing 1/4 of the stiffness, that's a lot!
Cadex (or other brands who use carbon spokes properly) can get close or even slightly better for stiffness; and stay within 100g of the Ultimates. no doubt we will see more of those example in the future; Hyper is there (but terrible hub reliability), farsport come close, BTLOS will offer something similar...
wickedstealthy wrote: ↑Thu Feb 02, 2023 8:46 pm
My duke 48/56 with cx ray and tactic hubs including tactic hubs 1270.
Taking the new 56/56 Baccara X using Briks carbon spokes you end up at 1200 without rimtape.
But again from a stiffness point of view you are nowhere near; Those numbers are very low in absolute compared to other data I published.
Regarding Briks spokes, I am not a fan of the Ti insert bonded on the inside of the spoke, it has a limited bonding area and the carbon fiber near the bond is exposed and their shape is not aero.
copying from what I posted here
viewtopic.php?f=132&t=171883, making light and stiff is not achieved by many