8-9 ft to flat, broke bb axle, result - almost had to give up trials (cracked bone in the foot + almost cut some vein open in my leg with what remained of the bb). now it's almost ok. that was 2,5 years ago. now i don't do drops, more than 7 ft i find is devastating the bike. well, i watched a video of chris plumptre doing a huge (22ft claimed) drop to flat, and that's probably an unofficial world record. you can probably download it at the velotrial club zurich website www.vtcz.ch this is it but i dont know if the link will work, because its kinda strange that site linkee