Not strong enough for large bikes. We had ordered this for a bike with 4" wide tires. After getting some sleep, I revisited it and worked it out. Charge time took the usual amount. I?m taken back in amazement! Das hätte ich in dem Preissegment nicht unbedingt erwartet. I have never felt so alive as I do with this amazing masterpiece of technology close me! The main one that I miss is the transparency feature which lets you hear yourself talking when you are on a phone call. The phone holder attaches easily to a bike?s handle bar and then can be adjusted to secure the phone. I have not found any flaws so far.