Bicycle Seat Position Fore and Aft

RB Inc Professional bicycle fit 7 days a week 79 Wingold ave 416 787 4998

Quick Tip: Symbols and Nomenclature in BikeFit

A common “language” or set of understood symbols is helpful to bike fitting for a number of reasons:
1. Symbols help provide seamless dissemination of bikefit information.
2. Symbols transcend language by becoming a “standard of communication.”

Saddle Fore-Aft
For some, saddle fore-aft (via tibial tuberosity over the pedal spindle or KOPS – knee-over-pedal-spindle) is a critical assessment in a bike fit. For others, this is more of a reference point. Either way this can be a very useful reference.
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Perhaps the fasted way to assess this in a bike fit is by using the BikeFit App for iPad . Take a brief video from the side view, toggle the video until one foot is at the 3 o’clock position (either foot forward at 3 is fine). Toggle the yellow line (represents the plumb line or laser line) forward or back until it is aligned with the pedal spindle at 3 o’clock.

KOPS via the BikeFit App for iPad
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Another great way to assess saddle fore-aft is by using a laser line- still much faster than the old plumb bob (and far more impressive to your clients). It is also easy to check the right leg verse left quickly. This is all done from the same side of the bike! (Retul people will like this).Self-Leveling Laser & Knee Straps Both laser and BikeFit App save time and allows fitters to keep an eye on the global (overall) view- you can step back and take a look rather than hold the plumb bob in place. And one could argue that both are more accurate in that assessment is completed dynamically (while riding)

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HINT: Setting the App line or laser line through the pedal spindle of both left & right pedal helps us make sure the line is perpendicular to the bike.
If not using the App to save your notes we often use our white board for hand written notes as shown below. The red line indicates the location of the tibial tuberosity over the pedal spindle. The “>” symbol indicates the tibial tuberosity placed in the 3 o’clock position
Fig. 1 the saddle is much further forward than it is in Fig. 2. On the white board is an example of the symbol used accordingly. Not shown is a saddle position further aft (back).
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To purchase the BikeFit App, go to the App Store on your iPad and search for BikeFit (all one word). Introductory cost is only $39.95 – this price includes all of the measurement tools. And right now we’re offering 3 Screen Shot 2014-11-26 at 7.13.11 PM

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