Through Authenticate 
Specification
Material : Aluminum
Color : Carbon Black
Description
Most Riders are unaware that some leg fatigue when riding is caused by the naturally occurring uneven resistance of a crank system. The new dual swing arm concept of the Cranktip pedals overcomes this problem whilst also providing greater energy.
Video
http://pantaiwan.imb2b.com/video/index.php?itemid=244
http://pantaiwan.imb2b.com/video/index.php?itemid=245
