Brucey wrote:Also don't forget that your pedalling stroke will have become habituated to the dawes; the slightest change in crank length or riding position may mean that you simply don't pedal so well on the trek.
I might normally agree with you, but I spent all winter 7 months training on the turbo & skip trainer which both have 170's.
The tourer which I did ride previously 8 months ago had just two outings (2 x 35 miles) then I rode it on my latest 12 hr marathon 168 miles in 12 h 30 mins (13 hrs with puncture) 10 hr 50 in the saddle, it has 175's.
I have predomantly rode 175's on my MTB & Tourer, for five years previous to that, I always thought that the 175's felt a little clunky for my legs but at an average 7 mph on Dartmoor treks over 120 miles average there's a lot of stop starting and heavy slow cadence.
The tourer I did use for fast training but cadence probably limited to 85 max.
So I thought I better check the seat height Tourer compared to the skip trainer, but did not bother before 12h ride, and I see now that the tourer on all other bike fit being similar was 5MM longer seat height (tourer 175) than the skip trainer 170, so my mid crank position is the same extension but 5MM further forward and back (more range) and higher knee (5MM) assuming that the ankle does not flex and extend further
Or does it..........
Having ridden 170's for most of my life then swapping to 175's in the last six years it might just be that I am flexible on crank length, I do have pretty supple ankles too, so it might be that the ankle movement through any natural ankling that we all have to a larger of lesser extent makes up for the crank difference
Or does the knee flex and extend further ? Or both
My tendonitous of two years ago in long gone and only feel calf pulls with the daily isometric ankle exercises, the mild pulls do not affect my cycling one jot.
No specific muscle pain etc on the 168 & 215 mile rides 7 days apart so the late swap back to 175's was not a problem.
I noticed also that at the tail end of my 215 mile ride that I was still standing out of saddle on the flat as well as hills to relieve my weakening sit down muscles
This I put down to training with the 23 kilo skip trainer on some very steep climbs where I purposely used the middle clanger at a very low cadence typicaly 30 - 35. Not previously been a fan of out of the saddle riding.
I.M.O. Lower body fit can only be assesed by feel if you press yourself hard, and if you do not have supple muscles it will be difficult to tell the difference between bad fit and jaded muscles.
Most of the bike fit queries sound like frustration in lack of improved performance, which is a long term slog not an instant fix.
As for weight, we become obsessed with light bikes, but I have proved heavy is a rapid path to increased performance, all on just 1860 miles training this year
And its been said here that the biggest gain to be made is improved power, not reduced weight of cycle parts...........