Experiment #1: 20h disc front wheel
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Just 'finished' a rebuild of a front wheel. I think I need 2mm longer nipples for looks. The threads are at the bottom of the nipples inside the rim
Its an experiment. 'They say' that you can't run a 20h disc hub up front. We'll see. I'll either keep this as is, re-do the nipples, or sell it to someone smaller than me. As it is: 650g Sapim butted spokes (14/15), black brass nipples, Bitex CX hub. The rear is up next. I'm debating ordering some longer nipples 'just because.' M I can't seem to get the 2nd pic to upload. Someone wanna try it for me? |
When they first move to 32h, the 36h people was like :no:
And then when they move to 28h, the 32h people was like :no: And then when they move to 24h, the 28h people was like :no: And then when they move to 20h, the 24h people was like :no: And then when they move to 16h, all hell breaks loose. :D I have an expression for this phenomenon, it's called Generational Gap. |
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Regarding "they say you can't" Rolf has been making them for years..........20h front disc wheel for singles and tandems.
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IMHO, of course, 'pal'.. |
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Data point: Boyd had to replace some hubs under warranty in a set of deep carbon wheels I owned. I asked them to replace the hubs with disc versions, but they wouldn't do it b/c the wheel had too few (20) spokes. It was annoying to me, but I respected that they know a lot more about wheels than I do.
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I’m sure you could get away with it for some number of miles and uses... What I don’t fully understand is what compelling gain there would be / reason for running a 20h wheel... (But then again, neither do I understand the reason for running a radially spoked wheel instead of 3-cross, NDS tension mitigation excluded.)
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Next CX season, I'll be rockin and rollin the disc tubulars M |
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http://www.wheelfanatyk.com/wp-conte...ple-thread.jpg |
I don't like where this is going.....
Low spoke count, spoke/nipple interface not ideal and disc brake. :banana: |
Disc brake spoke loads
So, take a look spoke loading from the disc brake:
Torque loads (as from pedaling or hub brakes) are distributed nearly equally among all the spokes. So with a large number of spokes, the stresses from torque loads will be much smaller than the stresses from radial (weight bearing) loads, which are distributed over a smaller number of spokes. But with a smaller number of spokes, stresses on individual spokes increase. But there are several mitigating factors at work on this particular wheel: 1) Stresses from torques are inversely proportional to flange size. Since rotor-side flange on this wheel is oversized, that will help reduce spoke stress. 2) Spoke stresses from torque also decrease with spoke angle. The rotor-side spokes on this wheel are laced in a 2x pattern which results in a 72 degree spoke angle, which isn't far from tangential (and also greater than the 67.5 degree spoke angle in the popular 32 spokes 3x pattern). Personally, I wouldn't have a problem with this 20 spoke disc brake wheel. Spoke stresses from disc brakes are small and infrequent enough to begin with, and this particular wheel doesn't increase them by much. |
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I don't plan on this wheel seeing a whole lot of mileage. If it starts to be a problem child, I'll sell it to someone small. The rear is 24h. Should be Ok. AFA the nipples, from the outside, they look like they're OK (the good pic) M |
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Let's try this
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