Rider height checked against the bike, not just recorded
You've always been able to collect a rider's height and set a height range per size, but nothing compared the two, so a 160cm rider could book an extra-large and nobody would know until they turned up. A height outside the range now shows a warning naming the size that does fit, right under that size instead of in a separate block. A new setting turns that warning into a stop, so the booking can't continue until the size or the height changes. It's off by default, and only appears if you're collecting heights in the first place.