I recently bought a bike that has been repainted over the original paint and couldn’t figure out what it is. After removing the two layers of paint on the BB where I thought it should be. Luckily, I found the serial number was baffled by only 5 characters (JBC09). I first thought this might be a Klein based on a unique feature at the juncture of the top and steering tube. I have a Litespeed Niota that has almost the same feature (pic shows the mystery frame). I determined it is most likely an aluminum frame since it did not throw out any sparks with a grinding wheel. The bike is 18 lbs without pedals with externally routed cables and a chain hanger on the seat stay. The oversized downtube goes from nearly round (56mm) to retangular (54mm by 47mm)) at the BB. The seat tube is 31.6). Any guesses?