More torque effects... measurements on a wheel with 14 crossed spokes

[Ron Ruff]

Since I just built a wheel for my personal use that has 14 crossed
spokes, I thought I'd do some more measurements on the effects of
torque. The original thread is here:
http://groups.google.com/group/rec.bicycles.tech/browse_frm/thread/9f545720b6cdc20e

Measurements were done 3 times on both a pushing and pulling spoke at
~90 degrees from the vertical plane, using a Park gauge. The gear was
34/26 and the estimated force on the pedal was 150lb. The pulling
spoke avg delta was 33.4 kg. The pushing spoke avg delta was 32 kg.
Plugging the numbers into my spreadsheet (assuming a 22mm effective
flange radius... spokes are pretty tangential at 28h 3x), I get an avg
delta tension of 29.2 kg.

So... I'd still say that the only mystery here is how much force can
really be applied. At any rate, I'm going to avoid doing low gear
stomping sprints with my new wheels...

 

[Damn Small Linux]

On 25 Feb 2007 19:43:14 -0800, Ron Ruff wrote:

> Since I just built a wheel for my personal use that has 14 crossed
> spokes, I thought I'd do some more measurements on the effects of
> torque. The original thread is here:
> http://groups.google.com/group/rec.bicycles.tech/browse_frm/thread/9f545720b6cdc20e
>
> Measurements were done 3 times on both a pushing and pulling spoke at
> ~90 degrees from the vertical plane, using a Park gauge. The gear was
> 34/26 and the estimated force on the pedal was 150lb. The pulling
> spoke avg delta was 33.4 kg. The pushing spoke avg delta was 32 kg.
> Plugging the numbers into my spreadsheet (assuming a 22mm effective
> flange radius... spokes are pretty tangential at 28h 3x), I get an avg
> delta tension of 29.2 kg.
>
> So... I'd still say that the only mystery here is how much force can
> really be applied. At any rate, I'm going to avoid doing low gear
> stomping sprints with my new wheels...

When I was kid we called it "popping a wheely" ...only wheel ejection I
ever saw firsthand was damn funny, guy popped a wheely and the front wheel
went rolling down the road for hundred yards or so....lol

As for worrying about your spokes... I DONT want whatever youre smoking
lol. Really sometimes I wonder if some of you people actually ride bikes
or not.

 

[Ron Ruff]

On Feb 26, 3:27 am, Damn Small Linux <[email protected]> wrote:
......

Uh...