basilic wrote:diegogarcia wrote:However, I seem to be tiring quicker on the bike with 53/39 than I do on the bike with 52/36.
DG, why to you attribute the tiredness to gearing? I can see it if you tire more specifically on climbs where you mash a 39/25 (3.27 m development) and wish for a 36/27 (2.88 m development). But riding in the big ring on the flat, the 1 tooth difference up front is immaterial. The cassettes are the same for the first 8 gears, with 23-25 tooth cogs at the low end for one, and 24-27 for the other.
How different are your 2 frames? if the 53/39 is overbuilt and stiff, that could play a role.
How different is the usage? if you use one for hard intervals and the other for smell the roses rides, well...
I dunno, but I have been rather ill this year with shingles, chicken pox and I am battling depression which is affecting me on the bike as it is very debilitating on physically as well as mentally. I also spend 98% of my working week stood up now and my power and form has dropped due to this so feel that changing things may help. According to the gear chart, running 50/34 with a 12/25 will be better for me than my current set up, but to be honest, I am so out of form, I cannot push anything like 53/12 or 11 as not got the strength. Presently I am running a junior cassette with 16-27 which helps a great deal and actually, works really well with the close ratios on from 16 though to 21. I am trying my best to get through it however. I have thought about walking away from bike riding, but it is the one thing that is helping me stay on top of my mental health though it is all getting a little confusing.