Originally Posted by wakked1
That sucks, but yeah thats usually one of 3 things:
a) tension
b) not enough float (i.e. you unclip because of too much heel angle)
c) not clipped in the first place... I've had this problem with a single shimano pedal... it felt like it was clipped it but it wasn't and would eventually release. finally realized that if I didn't hear a click, it wasn't good.
Otherwise I've sprinted hard enough to bring the front wheel off the ground w/o unclipping, and MTBers race on them all the time.. so...
a) The tension was all the way up.
b) I've been using them for years. I know how much angle is required to unclip.
c) I've experienced this too, and I can tell the difference. I had been clipped in long enough that I would have noticed.
I have actually done this before. Give me a brand new set of cleats and pedals and 15 minutes in a parking lot on a high enough gear, and I can pull my foot straight of the pedal. I actually demonstrated exactly this for the owner of my LBS who was also skeptical.
I'm pretty certain this wasn't anything I did wrong. I race, and I have a halfway decent sprint so I can put out a decent amount of torque. If you still really think this is impossible, I'll get some video in a couple of months. If I'm prepared for the possibility I can cope with the pullout. This time, I forgot.