Bike-Improvement

Fietsmeting-ds

Time Trail -Triatlon Adjustment

Bike-Improvement c.v. Gsm: 0492/ 31 00 71 Herentalsebaan 22 b 2520 Ranst ING: BE37 3630 9072 2928 Btw: BE0838.572.819 BIC code: BBRUBEBB
How do we do our fitting?
Our Recommendations!
We recommend our athletes to sit as optimally as possible, a Cobb Fifty-Five saddle or an ISM saddle. These saddles have many advantages. 1. With a classic saddle you will be sitting at the point of your saddle while doing a time trial or triathlon. This has certain consequences in terms of comfort. As a result, you will not be able to concentrate optimally on the painful and uncomfortable time trial posture. With the two saddles, mentioned above, you have much more comfort and the pain on the seat is completely gone. 2. The Fifty-Five of Cobb Cycling or Ism has the advantage that the rider can circumvent the UCI rule because these saddles are completely different in terms of construction than an ordinary saddle. Both are about 5 cm more forward. 3. The TT saddles also have another great advantage. Because of their special construction, more muscles around the pelvic floor are used and more power can be generated on the bike. You can already feel this when you ride the saddle for the very first time. You also feel your seat bones, which in the initial period cause some discomfort but disappears very quickly.
We first fully measure the athlete. Then we set the bike according to the standards of the UCI for the time trial riders. For triathletes other rules apply. The athlete then takes place on the time trial-triathlon bike and we do a video recording. The video recording is then analyzed with our Sports analyzer software. Based on the result of the analysis, the position is adjusted in consultation with the athlete. In this way new analyzes follow each time until the rider has found his perfect position. This method leads to very good results, but it takes a lot of time.
Windtunneltesting in Flanders Bike Valley During a two-day course, we have tested what is important to find the most aerodynamic position where the cyclist can generate the most power. This went from ordinary bike to aero bike, clothes, shoes, extensions and helmets. We would like to thank Bioracer for the use of different types of aerosuits, as well as Profile Design and the different types of extensions. The Lazer helmets also made some surprising results. Below is a schematic representation of our results. We are always at your disposal if you want information regarding triathlon or time trial posture.
Aerodynamic Resistance
Fundamentels of aerodynamics
P=D.U=1 2pU CdS
3
P= Power (Watt) D= Drag (N) U= Velocity (m/s) p= Density (kg/m ) Cd= Drag Coëficiënt S= Frontal Area (m²) CdS=drag area main aerodynamic property
3
Drag Coëfficiënt Cd
Reduction of aerodynamic drag by reducing CdS
Windtunnel in Flanders Bike Valley
This is resistance that you encounter from the headwind.
Rolling Resistance The whirlwind behind the driver is also an inhibiting factor which as much as possible must be excluded.
This is an example of how you can drive just as fast with less power if you meet a number of conditions. Clothing, aerobars, aerobars on top of the handlebars, in the drops or other extenders with different hand positions.
Above are the various options that we have used to perform the tests properly.
Starting Position: We started measuring the power of a person who rides at 50km / h in regular clothing and his hands placed on the brake levers. This requires an output of 609 watts. .
This is the position that Tom Dumoulin and Victor Campenaerts take on their TT bike. This posture is not comfortable but because of the many hours of training they can maintain this position for 2 hours. This posture is not recommended for Triathlon.
Different types of shoe covers and socks.
Different types of extensions are shown below.
The profile design extensions used during the course. The upper extension is not allowed by the UCI. This is the most aerodynamic extension and can be used for triathlon.
These are the results of the position of the extensions inwards or outwards. .
Above the test for different helmets. For this person, the Lazer Victor is the most aerodynamic one. But it doesn’t mean that it is the best aerodynamic helmet for everyone. It depends on how you are on the bike in function of flexibility and body measurements.
Aerometing systeem Bioracer = 99€ Aerometing in Windtunnel Flanders Bike Valley at Beringen= 685€