Fork ends are where the front wheel is attached. "Dropouts" are where the chainstays and seatstays meet.
On a track bike or good fixie, they are 'horizontal dropouts' as opposed to 'vertical dropouts' on a bike with a rear brake.
Please note : the angle of the vertical dropout on an elderly frame is parallel to the rear brake blocks. This is so that when chain tension is adjusted on a single speed roadbike, the wheel rim moves along the brake block and not up-and-down it. When pulling the rear wheel back to take up chain stretch, the rear brake block position does not have to be altered.
I hope that's sorted.
On a track bike or good fixie, they are 'horizontal dropouts' as opposed to 'vertical dropouts' on a bike with a rear brake.
Please note : the angle of the vertical dropout on an elderly frame is parallel to the rear brake blocks. This is so that when chain tension is adjusted on a single speed roadbike, the wheel rim moves along the brake block and not up-and-down it. When pulling the rear wheel back to take up chain stretch, the rear brake block position does not have to be altered.
I hope that's sorted.