O.SYMETRIC Chain wheel kit
• oval shape for optimized motion sequel
• material: aluminum 
Advantages 
• death-center can be overcome more easily
• a higher gear ratio is easier to ride
• higher efficiency, meaning reduced hear frequency at same power input
• chronical knee pressure is reduced
• muscles work easier, as well as the cardiovascular-system
• higher uphill speed (ca. 5 sec. gain per km)
• higher speed on flat tracks (ca. 3 sec. gain per km)