Rent cranks

[Eli Allen]

Anyone know if there is any way to rent 165mm cranks that are compatible with 11 speed Shimano?

For the explanation:

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

[Adam Goldberg]

Eli, I have a FSA 170mm crankset you can borrow … but it’s GXP 22/24, not Shimano.  If you have an English threaded BB, I have a a GXP BB to go with it.  Not sure you’d notice 2.5mm, but thought I’d offer (it’s just sitting on a shelf)

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[Eli Allen]

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

[Neal Becker]

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

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Those who don't understand recursion are doomed to repeat it

[Doug Scott]

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

On Jan 25, 2022, at 7:24 AM, Neal Becker <ndbe...@gmail.com> wrote:



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[Mike and Joan Divine]

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.

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[Eli Allen]

Length isn't that important, I'm trying to improve the rotation. Of
the cranks, obviously. I may be younger than almost everyone else
here (1 person younger, maybe?) so should be the one to act childish
but I'm a serious person who would never.......