Hi all

I am currently building a beach cruiser from scratch and was hoping to fit a cottered crank to it. However I have now tried both a 140mm and a 145mm spindle and with both I am having issues with the clearance at the rear of the frame on both the chain wheel and at the ends of the cranks. The chainwheel is 46 tooth, and the cranks are a 165mm hole to hole. Is there a way to get round this problem or am i going to have to reconsider different options? and if so, what are my best options?

Thanks in advance for the help!