Adam Hansen's Seat Height with the TYPE-R Part 2

I'm back for my next article here on LEOMO. Please read my last article to stay on track a little. With my previous article, you may have learned that seat height is very sensitive regarding the type of seat you choose. Riding different saddles at the same height does not necessarily mean that you are riding in the same position. Each saddle is unique and might position your pelvis differently than another. The LEOMO TYPE-R clearly shows that my Leg Angular Range (LAR) changes when I change seats but keep the saddle height constant, which will then allow you to maintain the same position. When you use the TYPE-R for a few rides, you begin to understand what your standard movement patterns are. When you make a change to your bike that affects your position, the TYPE-R gives you real-time feedback letting you know if you are to low or too high.

I want to take it a step further and talk more about the Pelvic Angle MPI. This one single sensor placed on your pelvis gives three critical measurements. With that single sensor, you can measure Pelvic Angle, Pelvic Rock, and Pelvic Rotation. In this article, we are going to focus only on the Pelvic Angle measurement. The MPI is interesting because I can determine, by looking at the LEOMO Dashboard, if I am seated normal, in my race position, or standing up. It is incredible how you can not hide from the TYPE-R data. It knows the training that you are doing and how you are doing it. Take a look at an example in the graph below:

In the data, I am doing thirty seconds hard, thirty seconds easy. I am performing the hard efforts standing up and the easy (recovery part) seated. I conducted this workout on a climb in the area where I live. Here is where the LEOMO software and dashboard shines. Through the TYPE-Rs data, this workout is easily recognizable. Time can go by, and I can look at the workout and know what I did that day. We can see our past workout data because each workout leaves a unique motion fingerprint.

Why is Pelvic Angle so essential in my eyes? Based on the image above, I have learned that there are more than just two positions on the bike. It is not just as simple as standing and seated. The TYPE-R helped me recognize that there are two seated positions: standard seated position and race seated position. Have a look at the two images below: 

Race Seated Position:

 

Standard Seated Position:

 

I know when I am in race seated position, my Pelvic Angle changes, and I sit far more forwards on the saddle. Let's have a close-up look here:

It's the same as the two images above; I just combined them to show the comparison between my saddle and my pelvis during race seated mode and standard seated mode. The difference is that in race mode, my pelvic angle changes. I also slide forward on the seat, as all pros do. You can see this by the amount of seat space that is free behind me, looks about 3-4 cms difference.

 

What some people forget is when you slide forward on your saddle, you are moving closer to the bottom bracket. Once again this decreases the distance from the seat height to the bottom bracket. I can see directly on my LEOMO TYPE-R that my LAR changes. It dropped. Here are two examples of two intervals I did:

During these intervals, I used the same bike. The more I slide forward and put myself in a more aggressive position, my Pelvic Angle changes. Because I am closer to the bottom bracket, my LAR has decreased. Therefore my legs are not getting enough angular range. This shows that testing outdoors is more important than your standard indoor test. We need to take note of what we do in a race position. I want the best possible bike fit for my race position. Not in a standard position where I am just on my coffee shop bike ride. With this in mind, I am considering changing my bike position to be a better fit in race mode with a greater LAR to be able to produce more power.


1 comment


  • Nick Marshall

    Hey Adam, enjoying the articles and seeing how Leomo can be applied day-to-day with fitting.
    You mentioned previously that you have a different range of motion between the right and left foot that you identified with the Leomo. Does this difference become more noticeable when you slide forward on the saddle ( i.e. pelvis no longer planted squarely ) ? Or do you manage to keep the range of motion the same even with the ischial tuberosities floating either side of the saddle beak ?
    I ask this because of the difficulties I face each day trying to position riders and equalising their range of foot motion using saddle height and width for their pelvic stability.
    Thanks very much! Nick


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