Ive checked all connections the are ok unplugged and plugged back in , tinkered with the settings every thing looks ok to the eye , the bike seems to be ok when im not sat on the bike and running it with the wheel in the air , but when im on it it kind of holds back a little bit then goes again not a totaly smooth ride , but all runs silent thats the only issue like a power lag , the battery is brand new from wallen power 52v 20ah Panasonic 21700 cells this is the first run of it