TONGTU BICYCLE (GUANGZHOU) CO., LTD. GELEISEN Electric Mountain Bicycle for Adults 20" x 4.0 Fat Tire Commuter Ebike with Shimano Tourney 7speed Derailleur AL6061 Frame & Suspension Fork_TONGTU BICYCLE (GUANGZHOU) CO., LTD. is a full chain technology-based Electric Bicycle enterprise that integrates production, research and development, sales, and after-sales service. Its brand GELEISEN E-bike are popular worldwide.