after reading the comments on pictures posted i want to check on the hip / torso angle that you are commenting on. if i recall correctly from Dan’s article the 90* angle is from the pedal axle to the hip to the shoulder. Tom D’s before and after pics on his site and the comments on the last photo seem to address the angle of the femur / torso with the pedal at the furthest point. which is correct? if the knee angle is 150* then the differnce could be about 15* depending on the leg measurements!
thanks
So which one is correct?
" if i recall correctly from Dan’s article the 90* angle is from the pedal axle to the hip to the shoulder. "
That one.
Dan E.'s original angle is the pedal to hip to shoulder when the crank is inline with the effective seat tube angle. At the first FIST camp we discussed the rational for measuring femur-torso angle (at the same crank angle).
While, depending on the range used, these could produce the same position, measuring off the femur makes more sense to me as this is the actual “body angle” which has a biomechanical effect on the rider. We use the same range that Dan E. uses (90-100deg) but measuring the way we do it will produce slightly higher positions than Dan E. does.
apex is the greater trochanter. one line down to the pedal axle at bottom dead center. another line straight through the shoulder, coming out even with the collarbone. 95 degrees is close to ideal. less than 90 degrees is questionable. more than 100 degrees is questionable. more than 105 degrees is too obtuse.
Dan, What about the Fib? / pedal spindle relationship when pedals are at 3 & 9 o’clock? When I drop a plumb bob off my fib. it is fore of the pedal shaft by 5cm +/- my LBS guy says that is “off the charts”. Is that relative in a forward/aero position verses a slack/road position? Thanks
“Dan, What about the Fib? / pedal spindle relationship when pedals are at 3 & 9 o’clock?”
KOPS mandates a specific seat angle, with no ability to rotate the body complex further forward or rearward. don’t like that. therefore, the knee’s relationship to pedal axle is immaterial.