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High Performance GRU-4 CROATIA

High Performance GRU-4 CROATIA

The most powerful hub motor for electric bikes, the.Jan 03, 2014· Zvonimir is an engineer who lives in Croatia, between Italy and Greece on the beautiful Adriatic Sea (ES member HAL9000V2.0).In a recent story, we told our readers how he developed the Greyborg Warp frame, so builders could have the option of an electric bike that was heavy-duty, and could also hold the largest possible battery volume. It is a big success with over 200 frames sold

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