New to ebikes and looking to purchase my first. I've been looking at M2S R750 but not sure if the 19" or 21” bike is the correct size. I'm 6'3" with a 34" inseam. My current older Trek hybrid bike is a 21" frame and I recently tested a Trek Verve that was an XL size and the shop said it was also a 21" frame. Since I can't test the M2S, but the frame appears to be similar to many other fat tire bikes on the market. Also, I'm looking at their new version that will have 29" wheels so not sure if that matters as well. Any suggestions on frame size would be appreciated.