Vibration below 10mph on ST1

[Autopilot]

Dear EBR Forum,
I finally pulled the trigger on an ebike and got myself an ST1 Elite on clearance. It has a Sora shifter and a Deore XT derailleur. The bike is fast and responsive, the only issue I have is a very noticeable vibration/grinding sensation between 5-10mph, especially when the assistance kicks in. Above 11mph it smooths out and is as silent as it should be.
Has anyone faced this issue? I'm currently riding in 40deg weather.
Thanks.

 

[Ian Moone]

Dear EBR Forum,
I finally pulled the trigger on an ebike and got myself an ST1 Elite on clearance. It has a Sora shifter and a Deore XT derailleur. The bike is fast and responsive, the only issue I have is a very noticeable vibration/grinding sensation between 5-10mph, especially when the assistance kicks in. Above 11mph it smooths out and is as silent as it should be.
Has anyone faced this issue? I'm currently riding in 40deg weather.
Thanks.

. Maybe check for a Bent Disc on front or rear ? If it's not aligned you could feel the rubbing. ?

 

[Autopilot]

Thanks, I did check the rotors, but it seems like it has something to do with the Hub motor, as I can pedal on 0 mode without feeling the vibration.

 

[Ian Moone]

Thanks, I did check the rotors, but it seems like it has something to do with the Hub motor, as I can pedal on 0 mode without feeling the vibration.

Hmm... Is it a Geared hub ? I'm Close to Ordering a New ride in a couple weeks and it has a Geared Bafang 750 ... Kinda got me thinking now. ?

 

[Autopilot]

Hmm... Is it a Geared hub ? I'm Close to Ordering a New ride in a couple weeks and it has a Geared Bafang 750 ... Kinda got me thinking now. ?

This is a Stromer ST1 with a gearless direct drive motor. All magnets, no gears inside.

 

[Ian Moone]

This is a Stromer ST1 with a gearless direct drive motor. All magnets, no gears inside.

That's right ... Duh ! I saw Court's Review on it. ?