My friend dropped this bike off to me. He said he thought it was a 52 or 53. He got it from a guy who owned a bike shop. This was the display bike in the front window and when he closed the shop he took the display bike and it sat at his house. I looked on the drop out and under the crank for a s.n. but found none. The cranks on this thing are super short. The guy told him they were wheelie cranks or something like that. Any help IDing it would be greatly appreciated.