Established in 1992, Sumai Bicycle Co.,Ltd. is one of the biggest China diamondback bike manufacturer and wholesaler. We've gotten the WMI (World Manufacturer Identification) since 2005. Our company has perfect quality management systems with ISO9001 international quality authentication in 2002 and pays great attention to new product development. We have high-quality staff at design, oem diamondback bikes development and production fields, and have introduced in qualified personnel from foreign bicycle enterprise. Most of our products have been approved with CE certificate, and some approved with EEC, EPA and CARB.

The one at the Eurobike show had a 14 speed G-Boxx 1, with a Rohlloff 14 speed twist shifter. Finished bikes will have the G-Boxx 2 9 speed which is Sram trigger shifter compatible. They should be good to go in March but quantities will be very limited. Pricing to be confirmed.
Earlier this year we met Karl Nicolai, who unveiled the G-Boxx 2 and G-Con standard at the March ’06 Taipei show, not under the Nicolai brand but “Universal Transmissions,” at that show there were no other complete bikes apart from Nicolai’s own and a mock up of the Suntour bike. (The Suntour bike was designed in conjunction with Karl) Since then we have developed a new frame around the G-Boxx with UK riding conditions in mind. What you see here is our first pre production sample, it’s heat treated and fully functional.”

This version is made up of two types, the fully recumbent and the semi-recumbent. The most popular one is the semi-recumbent. It places the rider in a large comfortable seat that can be described as a padded office chair meets a riding mower seat. The pedaling position reclines the user and allows for a feet forward cycling motion. The pedaling angle varies but most are at about forty five degrees or close to the angle when your foot is on your car accelerator. These machines tend to be looked at as a less intense workout due to its very comfortable riding position. However, in truth, they provide a higher calorie burning workout than the upright bike. You are forced to do what amounts to slight leg presses on every rotation without as much help from gravity as with an upright bike, thus the increased caloric burn. The less popular recumbent is called a fully-recumbent bike. While still a very good exercise, it requires the user to pedal directly in parallel line with the hips, not at the 45 degree angle of the semi-recumbent.

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