If you have the Panasonic electric bike motor in either 26 volt or 36 volt then this is very likely the replacement chainring you need when the one you have is worn out. There are a few systems with 35 tooth chainrings but those are rare. Please check your chainring to be certain that the one you have has 41 teeth. It is important to replace this chainring when you replace the chain and motor gear otherwise you may experience chain skipping.