I am fixing up an old street bike and it has 3/8'' axles. I am getting a new fork and I thought about upgrading to 14mm. Is it possible to change just the axle from a 3/8'' to 14mm or do I need to change the hub too. I just wanted to see how much trouble it is to change to 14mm. I am not even sure if my rear drop outs will fit a 14mm axle. I will be riding a new street park in my town and it has a lot of hand rails, so I want the strongest bike I can have. 3/8'' might be enough but I just wanted to check. Thanks for the help guys.