As you can see, we offer several different frame sizes on all of our bikes (until some sell out). We offer a sizing chart that should solve most problems.
If you're still having trouble deciding between which frame size fits you best, let me describe why you should choose one over the other, regardless of your height or inseam.
If you're new at this sort of thing, we recommend sticking to our sizing chart. However, there are many advantages (and disadvantages) of riding a frame on the small (and large) side.
If you're on the cusp, we generally advise our riders to choose the small size. Why? Well, that way, the bike is much more maneuverable. When your frame is on the small side, it allows you to better handle the bike around turns and offers better practicality for city riding. On the other hand, if you're looking to long-distance ride or venture out of the city often, along with riding hills frequently, a larger frame might work better for you. If you're not stepping off the bike very often (few city lights and little traffic), a larger frame might fit you better.
One good rule of thumb is that you should be able to comfortably stand over your bike with your feet (barely) flat on the floor. If there's a lot of room there, your frame might be too small. If you can only get your toes on the floor, you might be standing over a frame that's slightly too large.
Still stuck? Not to worry. Get in touch with us (855.255.5011 or firstname.lastname@example.org) and one of our experts will further assist you on which size is right for you.