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The Bike Fit Academy

889 members ‱ Free

7 contributions to The Bike Fit Academy
Accessing webinars
Do you have to be premium now to access the webinars?
0 likes ‱ 10d
I hadn't realised some where premium and hadn't worked out that today's would be. I'll look into it. Thanks
Why do I need to keep changing my fit?
I hesitate to post this, as I may get a bit of a scolding, but here it goes . . . I'm not exactly the brightest tool in the refrigerator, so it may just be that there is something obvious that I'm overlooking. I have this OCD thing about constantly adjusting my bike fit. (This seems to get worse as the years go by. Past few years it's pretty much every ride I'm changing things. YES, I know I shouldn't be doing that, but . . . ) No matter how I adjust it, it always feels like something is not right. I DON'T mean that it causes pain, it's more that a lot of the effort my legs are putting out isn't making it to the pedals. Sometimes the fit feels so far off, it's physically impossible for me to do more than a Z1 effort, even if I had the fitness of Pogacar! (And I know it's not fatigue, because there've been times when adjusting the saddle 5 mm doubled my speed going up a 12% grade, without an increase in perceived effort. Maybe I'm just hyper-sensitive to fit changes?) Often, my pedal stroke is very jerky/choppy. Occasionally, my legs do weird things, like bowing out 20-30 cm from the TT on the upstroke, but, as soon as the down-stroke starts, they violently swing in, nearly hitting the TT. I don't dare mention the number of fit changes I made since I began detailed records in 2008! I've had 5 "pro" bike fittings, every one left me LESS comfortable, and slower. The measurements from them were so different, you'd swear they were for 5 different cyclists! For example, one had a saddle-to-bar reach of 52 cm, another 59 cm. One had the saddle setback 6 cm behind BB, another had it 12 cm. So, I know I won't find an answer by getting another pro fit. (Apparently, the fitters here in the USA are nowhere near the caliber of those in the UK.) The main issue seems to be that I need to keep changing my position . . . in order to stay in the same (relative) position. What I mean is, the most efficient (and comfortable) saddle position is pretty much HOP for height, and KOPS for setback, give or take a few mm. The thing is, some days HOP is 77 cm saddle height, other days it's 80 cm. Some days KOPS is 6 cm setback, other days it's 10 cm. If I didn't know better, I'd think my legs randomly grow and shrink at will, or something! (And, yes, I'm using the same bike, pedals, saddle, etc.) Often, soon after I start a ride, I'm like, "WHAT THE &@%*!?!?!?!", because the position feels so screwed up, it's like I'm on someone else's bike! (Even though at the end of the last ride, the fit felt perfect.) So, I spend most of the ride adjusting things 1 -- or 3 -- dozen times, then — usually a couple hundred meters before the end — I finally get it just right . . . or so I think. Then, on the next ride, once again it's "WHAT THE @^#*?!?!?!?!" So, the whole process starts again. (Similarly, immediately after doing a DIY indoor fit, that fit that felt just right feels horrible riding on the road. Again, I DON'T mean pain-wise, but efficiency/power.) Could such big differences in height and fore/aft on a daily basis indicate something physical is going on? Is it possible that I just need different positions on different days?
1 like ‱ 10d
be aware when measuring angles with on-line tools like Kinovea the distance from and the angle of the camera will affect the measurements and accuracy. The can be helpful to assist but do not rely on angles measured in this way. I totally agree with the "bike fit window" and there often has to be compromise somewhere in the system as we are all asymmetrical and the bike is not.
165mm VS 175mm fore/aft
Recently switched to 165 cranks, from 175. I know the saddle needs to be adjusted for that. I assumed it would be both 10mm higher and aft, to stay in the same relative position. But, I just saw a video where a fitter says the shorter cranks allow you to get further forward for more power. (It sounded like he meant the saddle position, not a longer reach.) So, how does the fore/aft change with shorter cranks? (Or, is this just another one of those highly individual things?)
0 likes ‱ 10d
As you raise the saddle is moves back away from the bottom bracket due to the angle of the seat tube. This mans that it may not need to go up the full 10mm and may not need to change fore / aft. I am not aware of any rules asn the seat tube angle will have a lot to play in this and there are variations in that. It is an individual thing between you and the bike you are riding.
Fit check
Hey guys, could you help to check if my saddle too high judging my hip movement? I feel that my hip is moving!
Fit check
1 like ‱ 10d
can you show a video from the side view too please as just from teh back it is not possible to be certain what is going on with the hip and knee angle through pedal stroke.
đŸ”„ Bike Fit Masterclass - Friday 20th Feb đŸ”„
This one is a big one... If you’ve ever thought: “Something feels off
 but I don’t actually know what it is.” This session is for you. On Friday 20th Feb, we’re diving into: How to Tell What’s Actually Wrong With Your Bike Fit Not guesswork. Not random tweaks. Not “try raising it 5mm.” You’ll learn: - What to observe before changing anything - Why adjusting too early makes things worse - How to separate real signals from noise - When doing nothing is actually the smartest move This is the session that stops you chasing problems and starts you understanding them. Head to the "Calendar" tab to find the Webinar. 🗓 Friday 20th Feb ⏰ 4pm GMT See you there!
0 likes ‱ Feb 20
How do I join
0 likes ‱ Feb 23
Hi, I did manage to (about 16.10) but my connection was poor and I kept being kicked off and eventually gave up unfortunately.
1-7 of 7
Gill Arnett
2
14points to level up
@gill-arnett-5272
Physiotherapist and Bike Fitter based in Leeds

Active 10d ago
Joined Jan 20, 2026
Leeds UK
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