Not sure why calculators differ but I can tell you DT is a exact implementation of the formulas in the back of the Jobst Brandt book. (I implemented them for my own purposes and my results were identical to DT.)
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Anyone know which Light Bicycle carbon rim is most dimensionally similar to HED Belgium+?
These look close except they’re hookless.
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Or these:
ERD within 2mm, rim brake compatible, not hookless.
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Hooked is significantly better for tubeless than hookless? Looks like LB says both are tubeless compatible? I’d be running 2.1 XC tires at <30 psi.
Never used hookless rims before but I think the gist is that they require “tubeless specific” tires at low psi but are lighter, stronger and more aero than hooked rims.
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AR24 is definitely the better choice for that tire.
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Just don’t get the flyweight, let the pressure get too low and slam a gap in the road…
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visually interesting! maybe a nice next step in composite rim design! maybe misconceived for some reason a materials engineering person will explain!:
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Lots of marketing bullshit there.
The spike hole angle thing is easy to achieve with post mold machining. The laminate includes Z-axis fibers which is a film from Boston Materials that improves inter-laminar strength “by up to 30%”.
Looks like they’ve begun using the material and simply started quoting the numbers from the material supplier.
That said, I like the design. If they can make a high impact strength shallow section rim, my estimation is that it will ride well.
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Oh I was largely ignoring the marketing nonsense, the wheelbuilding possibilities seem promising. seems good for strong bracing.
not sure about the aero properties of a rim with that inner profile, but I don’t think that was paramount for them
Yeah, I mentioned the section as it relates to comfort rather than aero. My experience is that shallower carbon rims absorb hits surprisingly well.
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Oh yeah I’m just generally noting the aero aspect. I’m curious about ease of building a wheel with less bending and selling of each spoke, and of the possibly stronger overall wheel.
I’m pretty sure there have been a few rims that have done the same trick internally
Certainly. Every LB rim I’ve built has directional spoke holes. Pretty sure most alloy rims do as well.
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Yup. This has been a thing on WTB’s nicer rims for some time. Offset and slightly angled drilling is pretty much the norm and WTB and some others take it a step further by drilling out even more material for the shoulder of the nipple to fit in to.
MAKE A 26" VERSION YOU COWARDS
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Some insights on the Z-axis fiber:
Good stuff, but not world changing.
These wheels are going together nicely:
First time using Sapim HM washers and they make for easy adjustments.
LB WR35 650b 32h to DT350 with Sapim Race 2.0/1.8 and brass double-square nips. Gonna be perfect for under-biking.
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Onyx is now making Berd-specific hub flanges that seem to make it all worthwhile
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Oh geez I’ve been Berd curious AND Onyx curious for a while, this is quite tempting
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