5G Pro / nano
Nearly Circle, Not Circle
Shape of 5G Pro/Nano are almost circular. But its characteristics are not circular’s. It makes your ‘pedaling’ circular.
Great shifting performance of oval chainring. (patent pending)
Give more chances to select
AL6061 chainrings give user more chances to experience various shape, ovality and size with affordable prices.
DOVAL Chainrings (4G) ?
■ Design concept of DOVAL Chainring started from exercise equipment, not bicycle. (We have made this exercise equipment: www.cys3d.com) 'CAM' and 'Movement starting position adjustment' function is applied to most lower body exercise equipment such as leg extension or leg curl. (see the figure below) The application of 'CAM' makes it possible to distribute a body load, and 'Movement starting position adjustment' makes it possible to cope with a special human condition. ■ These two concepts of 'CAM' and 'Movement starting position adjustment' were applied to a bicycle which people had used with adapting to it, not being developed with fitting people so far though we have a bicycle history of more than 200 years. We have already verified that this is possible through 10,000 and more users in Korea for the past 3 years.
① The improvement of average speed and the increase of traveling distance owing to the increase of output section (2 times larger than that of circular one, 1.5 times larger than that of symmetric oval one) ② Easy uphill and stable dancing owing to the application of asymmetric oval shape (PCT/KR2012/006634)
Saddle sore and hand numbness prevention, knee and back rehabilitation mode, and bicycle fitting reevaluation
4G DOVAL is made for rehabilitation and flat peedal. 11.7%, 13.5%, 16% ovality gives different experiences to user.
Tuning-up human body