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Doug Scott <doug...@gmail.com>: Jan 25 09:21AM -0500
https://www.stevehoggbikefitting.com/bikefit/2011/06/crank-length-which-one/
In ancient times, it was 170-172.5mm for road, 175-180 for TT and 165mm for the track. Length was generally driven by clearances and BB height as well as cadences.
Hogg is as good as they come, my sense of this is perfecting crank arm length is lower on his list of fit issues. It is also worth noting that if you are being guided by dual sided power meters in any of this, there are real limitations in the resolution of
most power meters through the pedal stroke. Many use a single strain gauge and a ton of inference to develop nice graphics. Then there is the whole issue of data only going to head units once per second….
Sent from my iPad
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"Mike and Joan Divine" <mikeandj...@erols.com>: Jan 25 09:25AM -0500
The smartass in me sees that there must be a good reply to the statement "Your cranks are probably too long" but I will leave it to your imagination as to what that is. About half will think this is childish and others will be thinking about what that reply
should be.
From: peda...@googlegroups.com <peda...@googlegroups.com> On Behalf Of Neal Becker
Sent: Tuesday, January 25, 2022 7:24 AM
To: Eli Allen <eall...@gmail.com>
Cc: Potomac Pedalers Discussion List <peda...@googlegroups.com>
Subject: Re: [pedalers] Re: Rent cranks
I've been seeing articles lately entitled "Your cranks are probably too long" which have gotten me wondering. Since my height is about 165 or so, the standard 170-175mm might be too long, and I do often have lower back pain.
Here's some info:
https://www.youtube.com/watch?v=vUygkHlcVMQ
https://www.youtube.com/watch?v=nJkQ8oeuugg
On Mon, Jan 24, 2022 at 8:10 PM Eli Allen <eall...@gmail.com <mailto:eall...@gmail.com> > wrote:
Since some may want better data of why I think this. There is a
deadspot in the bottom of my pedal stroke, this goes away if I lower
my saddle but that causes my knee to hurt. See:
https://app.leomo.io/activities/bdb33026-62f0-4a98-b7a3-663ec766a16e/share/zksaz5cq
https://app.leomo.io/activities/cc305607-41ca-440d-a60e-905ce3f597e2
https://app.leomo.io/activities/f1ec781b-dfa4-454d-b49b-11e3ad61672f
(pain is obviously not picked up by the leomo)
So if I make my pedal stroke smoother and waste less energy I should
be faster for less effort and probably more comfortable
> I've been tweaking my bike for using data from a leomo device and if I get my pedal stroke smooth at the bottom of the stroke my knee feels a bit uncomfortable around the start of the down stroke which could be from my knee being too bent. Similar to the
discomfort that turned to pain when I tried oval rings (oval rings means that in the start of the down stroke more force in needed on the pedal)
> I have 172.5mm cranks now so thinking moving to 165mm cranks would help but not completely sure so would rather test by swapping my cranks and seeing. (It's really easy to take off and put on Shimano cranks) would just be testing indoors on my kickr so no
need to adjust shifting as I'll just stay in erg mode
> Thanks
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