Tri and TT Bike Fit: The Magic Angle that the World's Best Share

[@ScottBrownCapeCod]

It's nice to see the real-world road analysis of the elite athletes and then the session on the Vertex. It's not just the lower back and pelvis that changes. I really notice the change in Lis's neck and shoulders when she is in the slack position -- it's much more scrunched up and tight looking. Something I think would lead to fatigue in a long duration ride. Great stuff, great machine, great video. Nice work Todd.

[@ttbikefitdotcom]

You are right - her spine effectively gets shorter due to the backward pelvic roll and you can see it in her neck. No doubt that is a high-stress position.

[@jkraich5317]

Great video, but I think you are missing a big component. The pelvic angle measured at the ischium and the seat. I have had several Triathletes come into my office with great femur angle when looked at from the side, but on x ray, the ischum was touching the seat. Wrong pelvic angle will put more pressure into the acetabulum ( the joint of the femur head and the pelis) When to much pressure is on this joint from a poor ischum angle, the rider will wobble from left to right when viewed from behind. This causes injury to several pelvic muscles and a loss of power.

[@chrismackenzie28]

Great video. As a long time triathlete looking for a Kona slot before my body gives out I found this very informative .

[@seandalt]

How much does hip flexibility play into this?

[@vicmariodeth]

What program do you use to trace lines with an angle? I use Kinovea but can't find the function there. Thanks in advance!

[@toddn.kenyon6900]

Pro trainer but they are out of business. Kinovea does have similar angle tools.

[@vicmariodeth]

@@toddn.kenyon6900 thank you! I will need to improve my Kinovea skills then :)

[@thepatternforms859]

So on an actual bike to affect this same change your just moving the seat more forward? To open the hip angle more? And if your moving the seat forward don’t you then have to change the reach?

[@toddn.kenyon6900]

and/or use shorter cranks. If moving forward (and up - to keep distance to pedals the same) then yes front end may need adjustment. The Vertex is designed so that changes to saddle position don't affect front end fit.

[@alextheroot2100]

Seems like you measure angle to front of seat clamp, not center. Do you assume using 20mm setback seatpost?

[@bobbysilver272]

5 minutes in and I still don't know whether "most" people are less than 28 degrees or more! What and why are the difficulties in attaining this angle? Thanks.

[@ttbikefitdotcom]

If you went past 5 minutes you probably figured it out. Most people are low 20s in generic tt setups. Smaller folks even less. Barriers to achieving mid 20s are slack seat angles, too long cranks, and ratio of upper leg to lower leg length.

[@bobbysilver272]

It is a good video with good close up analysis, But after 5 minutes, you still haven't said what the average person's angle is and whether this angle is best if it is less than about 27 degress or more etc...I will carry on watching.

[@ClarkS963]

I love these analysis videos. Thanks for doing them!

[@emf6621]

Apologies if I got something wrong, but this seems inconsistent: On Froome (1:10) you add the bike angle of 1 degree to the hip angle of 27 to get 28. On the Canyon rider (2:41) you subtract the bike angle to again get 28. Looks to me like the bike angle is downward sloping in both cases.

[@ttbikefitdotcom]

Froome';s bike is upward sloping 1 degree. Frodo's is downward 3 degrees

[@jason200912]

Tour riders set their seats low/medium. Time trial riders set it at maximum height. No idea why since time trial fitting provides more efficiency and total power

[@rockettt7]

Awesome analysis... Do you fit for road bikes as well?

[@ttbikefitdotcom]

Yes we do. I will eventually get a road fit video up as well using the Vertex.

[@gonzalomateo6744]

I WANT ONE NOW LOL

[@TOPSPEED_RacingTeam]

nonsense~