Loose spoke affect powertap?

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Loose spoke affect powertap?

Postby toolonglegs » Tue Mar 18, 2014 2:44 am

Silly question that isn't that important...but curious anyway.
Will a completely loose spoke ( non drive side ) on a 24 spoke wheel affect how a powertap records?.
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by BNA » Tue Mar 18, 2014 8:00 pm

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Re: Loose spoke affect powertap?

Postby Tarquin » Tue Mar 18, 2014 8:00 pm

toolonglegs wrote:Silly question that isn't that important...but curious anyway.
Will a completely loose spoke ( non drive side ) on a 24 spoke wheel affect how a powertap records?.


Given it's happened to me a few times.

It doesn't seem to have affected the readings I had at the time, power seemed consistent with what I would expect.
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Re: Loose spoke affect powertap?

Postby toolonglegs » Tue Mar 18, 2014 9:07 pm

My numbers where a bit funny at Sunday's race... then Monday morning I noticed the spoke was totally loose. The wheel builder is rather embarrassed!.
Being it was a 70km criterium I didn't expect to have any amazing numbers over a minute or so, but all my peak numbers are way below the normal curve and I can't of being riding that bad coming in fourth!... or maybe the crap numbers are why I only came 4th :oops: .
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Re: Loose spoke affect powertap?

Postby Alex Simmons/RST » Wed Mar 19, 2014 6:52 am

Probably not, but the torque is read via NDS, so it's possible in theory I suppose it might cause some form of variance with timing delay of torque transfer. Really though the forces have to be balanced, so I doubt it.

But if a loose spoke caused wheel to rub, you may have got less speed for your power.

It's too early in the morning to think straight so can't say if any rubbing may possibly cause an auto zero problem, but that's speculation only on my part, would need to test that as I haven't thought hard enough about how the auto-zero triggers.

But in general, spoke tension shouldn't affect PT accuracy.
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Re: Loose spoke affect powertap?

Postby toolonglegs » Wed Mar 19, 2014 4:07 pm

Cheers Alex, was just curious as everything seemed to be a bit skewed.
I got of lightly ... Team mate destroyed a zipp 404 ... You really had to remember where the potholes were and be good at bunny hopping. A lot of time was spent riding on the footpath :lol:
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