no 19 is fine. it's weird how they measure them though. it's different. like they don't measure the entire tube or something. I recently got rid of an 18" even though I measured it much bigger according to road specs. I now have a 20" MTB which is the correct size for me and my legs and it is way more comfortable. I stayed with the same brand and geometry so it was interesting to see the difference the bigger frame alone made