Sunday, February 8, 2009

Bike Fit

My crack at bike fitting. I used the standards from Slowtwitch.com as my guide. I figured if the key measurements fell within their guide lines, than I was pretty close. Here are their ranges:
Knee = 140 -150 degrees
Shoulder = 80-85 degrees
Hip = 95 - 105 degrees

Here's my before pic:
Knee = 148 degrees
Shoulder = 85 degrees
Elbow = 76 degrees
Hip = 102 degrees

















Here's after lowering the saddle and handlebars. And replacing the stem with one 2 cm shorter
Knee = 143 degrees
Shoulder = 82 degrees
Elbow = 86 degrees
Hip = 102 degrees

It felt better. Especially the reach to the aero bars. I may end up bring the saddle up a smidge. But for now, I think I'm in a good starting place.

5 comments:

GZ said...

does it make a difference in the neck? I notice your head is much more perched up in the second shot. I have little clue about bike angles, etc, fitting ... but that is the stuff that hurts the most when I bike.

Philip said...

I just happen to be looking up in the second pic. It's looks about the same for the first position too. I actually shot a short video on me riding and then pulled a fame that had my legs in the right spot. The second should be better for my neck, because my arms are further underneath my shoulder, so less strain in my neck and shoulders.

Bilko said...

Thanks for sharing your process so far. I gotta ask How's your connection to the pedal? I.e. - did you check your feet? Misalignment at the foot-pedal connection can be bad --- short and long term.

Philip said...

Oh, I don't know if this is a "process" :) I'm just winging it based on the info om the slowtwitch site. As for the shoes/cleats, I didn't change anything, same angles I've been running for a few seasons now. Shimano SPL pedals, the cleats as far back as they will go on the shoe and they are lined up with the "line" of the shoe. My knees track pretty straight and I've never really had any issues with my knees or hips. Now that I think about it, video from the back may let me see if my ankles are tracking straight too.

C. H. Dale said...

How did you determine where the hip socket was located in each picture? It looks to me like the after pic has this point much higher and further forward. I ask this only because nearly every angle measured is based off this one point in the diagram.