Hi all, sorry if this is a basic question. I’m planning to get a bike for my wife and need some advice on sizing. I’m currently riding a 20” ttrifold, and she has tried it and feels comfortable on it. However, based on what I’ve seen online, 16” trifold is usually recommended for someone around 160cm. In this case, would it be better to go for a 16” or stick with a 20”? Appreciate any advice, thanks!