Based on my experience, I found the same crankset (DA 9100) in a 172.5 that I was confident would solve my problems. In the meantime, I continued using the 175s after taking a few days off and switching to an old, comfortable saddle from another bike (Selle Italia SLR Gel Flow). I went gingerly for a couple rides, and now I've become accustomed to the longer cranks. I also started core stretching to help. I found that I can ride in the drops without any discomfort.
So my question is this - should I leave well enough alone or go with the same setup as all my other bikes. I'm pretty happy with the way this bike feels. The pressing issue with me is that I also purchased a Pioneer power meter - I have the box and need to send my crankset in for installation. So I have to make a choice.
Have others messed with different crank lengths?
In the meanwhile ride it.
If you don't find anything in a while and still would like to switch just get a used crank at an ok deal and sell your old crank.
I found that here in China. A lot of people sell their 9100 cranks because they want to upgrade to power meter cranks, and they sell them quite cheap. I think the 9100 came standard on the bike they ordered.
Thanks. When I posted my message I was directing my questions to the OP and I didn't see your post. I think for your height 175mm seems morel like the norm. I don't feel the crank length formulas are accurate.dastott wrote: ↑Tue Feb 20, 2018 6:46 amMy inseam is 90cm. Think I would still prefer 175mm but it's too much hassle and expense to change from 172.5mm TBH. The bike with 172.5mm is also an aero bike for flat and rolling rides, and my lightweight climber has 175mm so will probably just leave it like that. Yes, 90rpm on 5% is about what I do too, with either crank length.
I'm 172cm with 78.5cm inseam, so short legged, but I have large feet. My shoe size is 45.
I've ridden 170/172.5/175mm. 172.5 mostly, last season switched to 170.
Looking to invest into new Stages power meter and I'm considering 172.5 because they feel OK and (in my mind) have greater potential to sell themselves when I'm done with them (as opposed to 170s).
I could say I felt "fluent" on all of them, without any discomfort, but I could bend most with 170s.
I'm 177 cm with an 80 cm inseam.
To complicate matters, this new bike is a compact with an 11-30 cassette. I'm used to 53/39, and my area is very hilly. so my cadences have gone up on the climbs. I was so used to smashing the pedals and suffering, so my satisfaction with the longer crank arms may be muddied somewhat. I definitely feel like the sweetspot for spinning is about 83, while I used to prefer about 89.
The formulas say I should be on 172.5 which was perfect since that came on all the bikes I ever bought. However I was always fighting discomfort in my knees and hips.
I messed with saddle height/fore/aft and pedals forward/back/in/out/shims, nothing helped.
Got a pro bike fit and swapped down to 165mm. I've never felt more comfortable and relaxed on the bike. Saddle height went up a bit and bars down, so double win on the 'look' as well.
I'm thinking if I during an ftp test for example default to 110-115 (simply based on comfort). Does that mean my cranks are too short?
I see my heart rate decrease slightly when I force myself to stay under 110 like 105 but my legs start to ache a bit. I get that feeling of unsustainability.
What do you think? I'm new to structured training. Got two seasons behind me and maybe 20.000km ridden.
For an FTP test, it depends which test protocol you are doing. For a 20min test, I can't imagine staying at 110rpm the whole time...I want my skeletal leg muscles to be dead at the end of the effort. Basically I watch my HR after about 5min and see if it plateaus. If it pegs itself at LTHR then that's great...if it dips and my legs still feel heavy, then I shift to a lower gear ratio and up my cadence until the final 3 minutes or so, where I want my legs to fall off.
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