1,429% is the difference in length between 175 and 172,5 mm crank arm length. Some want me/you to believe that such difference makes such sensation.... Well
The difference between 170 and 172.5mm cranks is 5mm. Go change your saddle height by 5mm and I’ll guarantee you notice the difference.
Nope; difference between 170 and 172,5 is 2.5 , not 5. Math for 7y old
. Difference in radius at the center pedal mount will be 5mm. Still same 1.43%
of diameter of the circle. 5 from 350 for 175 crank.
If 2.5mm higher feet position makes to someone breath issue.... Does it , really ? TWO AND A HALF OF MILIMETER ??? Come on....
Somehow I can't see anyones saddle height measurements done from top of the pedal, not even from pedal/ arm bolt center. Always from the center of the bottom bracket... regardless pedals, shoes, insoles.... what can make more than 5 mm difference...
And no, 5mm of saddle height is virtually non noticeable for me. Different bibs have different pad thicknesses, different saddles ( and position on it ) , I'm using road and mtb pedals ... have same saddle height for all setups. And for all type of shoes. I'll bet difference is more than 5mm... to not mention measuring accuracy for different saddle profiles. I can ask also, are all scales "certified" ?
again : saddle height 755mm + crank arm 175mm = 930mm / 5mm is equal to 0.54% of length,,,,,
I'll bet in blind test literally no one using 172.5 would notice change for 175.
In last two years I used 172,5, 170 and 175 cranks ( 182 / inseam 84 ) ; only difefrence I noticed between shortest and longest was reduced levarage forcing to use higher cadence. That's all. And about knee and its pain - after 4 reconstructions and few years between hospitals and physiotherapist - I know ... everything.
What cause knee pain is its position against center of motion ( much more complicated, connected to hip position, angles... ) , not 1,4% difference in leverage arm.
Disclaimer : for some ( mostly pro's ) using same few bikes any chang ein setup will be immediately noticable. No doubts. For the rest....
Go to Heaven for the climate, Hell for the company.Mark Twain
I can be wrong, and have plenty of examples for that