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PostPosted: Tue Nov 24, 2020 9:09 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 10427
Location: New Forest, UK
legrandefromage wrote:
Not a clue! Cranks were bendy, frame was small, sold it


And there I was worrying if you had sold the Norman Fay!

Thanks, I'll see what M737 with a short BB feels like.


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PostPosted: Tue Nov 24, 2020 9:13 pm 
King of the Skip Monkeys
King of the Skip Monkeys

Joined: Wed Nov 07, 2007 4:34 pm
Posts: 33012
hamster wrote:
legrandefromage wrote:
Not a clue! Cranks were bendy, frame was small, sold it


And there I was worrying if you had sold the Norman Fay!

Thanks, I'll see what M737 with a short BB feels like.



Kermitgreenkona has the Norman, it will end up with me again soon, I'm sure.


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PostPosted: Tue Jan 12, 2021 8:20 pm 
Dirt Disciple

Joined: Tue Jul 14, 2020 6:44 am
Posts: 67
So would a TA/ Stronglight be a lot more flexy than an hollow tech?


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PostPosted: Tue Jan 12, 2021 9:23 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 10427
Location: New Forest, UK
A lot of this is Shimano marketing puff, as there is no energy loss in the crank from flexing - it simply springs back. The deflections are relatively small anyway, cartianly by comparison with bottom bracket flex.

When the bike industry went to aluminium frames (because they were cheaper to make than steel) then they were noticeably stiffer and harsher to ride. 'Not harsh sir, stiff! Low energy loss!' And thus the myth was born. As Cycle journalism generally doesn't dare moon the Shimano gorilla, this stuff doesn't get challenged. For some reason the magazine that did real-life tests on a jig and worked out that the latest Dura Ace shifted more slowly than the old one didn't get many more reviews to do. Etc.
If you read the Bicycling Science book, US Army research suggests that harsh frames would be actually less efficient as they bounce the muscles around which DOES give an energy loss.


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PostPosted: Tue Jan 12, 2021 10:56 pm 
Retro Guru

Joined: Wed Dec 10, 2008 9:19 am
Posts: 2849
Tommy27 wrote:
So would a TA/ Stronglight be a lot more flexy than an hollow tech?

All you can be sure of is that you won't notice whether it is or isnt, and any difference in speed will be microscopic

It will weigh a few grammes more if that matters


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PostPosted: Mon Jan 18, 2021 10:15 am 
Dirt Disciple

Joined: Tue Jul 14, 2020 6:44 am
Posts: 67
I think what attracts me to going back to square taper is that in 7 years, I've had 3 hollowtech bottom brackets and 2 pairs of cranks. I don't remember ever having to change them so much beforehand?


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