Now that I've gotten my new bike, I think my dad is a bit envious. His birthday is coming up, and my husband and I are going to surprise him with a new hybrid bike. I know that if he were buying the bike himself, he would get a bike fitting at the shop, but that would ruin the surprise. He's about 5'9--What size should I get him? Is a 22.5 too big? Or is that about right? Worst case scenario, it doesn't fit and we can swap it for another bike at the shop, but I'd like to get the size right on the first try.