Confused about frame sizes
Ok this is strictly speaking a question about hybrids, but anyway I'm mid-50s and looking to buy my first "proper" bike and have been looking at sports hybrids. I've 5'5" within 29" inside leg. Now I've looked at a number of sites to give me an idea of correct frame sizes. Wiggle size table gives me 17" frame for a sports hybrid and 50cm for a standard road bike. So I look at a couple of hybrids - Giant Rapid 4 and Boardman Comp and both are measured in centimetres. Not only that but the Giant has a 46.5cm as "small" while the Boardman has options at 45/49/54cm. So I now have 5 possibilities - 17" (43.18cm), 50cm, 46.5cm, 45cm or 49cm! Am I missing something?