Originally posted by stumpjumper
Those are called fork ends (yes, the ones in the rear are fork ends) and are found on single speed and fixed gear bikes like track and BMX bikes.
Yeah, I vaguely remember from my youth having had them on my BMX bike. However, I didn't have a QR on my BMX. I've seen this style fork-end on a roadbike and was wondering how one uses it in conjunction with the QR.