http://www.ec21.com/ec-market/v twin cruiser.html http://fayyan.en.ec21.com/Electric_Bicycle_TDF36Z--1790667_950771.html Components Frame: Al Alloy 6061 T6 Tyres: 26"?.75",puncture resistant K-shield Rim: Al Alloy twin wall and CNC side20090112 http://molika.en.ec21.com/Electric_Bike_QQ_209--866431_866474.htmltwin wall and CNC side wall Spokes 13 g Stainless steel Brakes(front) 20081204 http://wellsaler012.en.ec21.com/2008_Yamaha_V_Star_1300--3146532_3146569.htmlV-twin produces excellent power across the board along with a highly stimulating exhaust note. Neo-streamline design, 20081120 http://cnfeima.en.ec21.com/Electric_Bicycle_E_Bike_YM--2241460_2241475.htmlFrame : Aluminum alloy 6061 T6 Tyres : 26 ? x 1.95, puncture resistant K-shield Rim : Aluminum alloy twin wall and CNC 20070909