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Hi all just bought a 2017 powerfly 7. Really like the bike. I decided to replace the cassette and chain plus the front chain ring. The std one for my bike is 15t and it has a shoulder on one side. The one I took of the bike was a 18t with no shoulder. My question is which wat around do I place...

Hi my name is Neil. I live in Gloucester not far from the forest of dean (great cycle park). i have just bought a second hand TREK powerfly 7 i think its 2017 or 2018. I am totally new to the Ebike stuff so bear with me. hope I can contribute and from time to time pick your collective brains...