after speaking to tarty, the conclusion is.... they all dont engage properly at speed, due to them having soooooo many eps, that there isnt really that hard whack on it, it cant grab an ep quick enough. Because it is whizzing round so fast with its bazillion eps, it does not have enough force to catch that ep. And when your doing a sizeable speed, it will chase that ep but, by the time it gets it, the cranks have already done a few rotations, leaving you upside down in a bush. or something along the lines of that.... ben, i use mine every day too, and it sure goes through hell with a fairly new rider giving it some serious beans for a few yours a day, every day. it works at low speeds very well though, apart from the odd skip, so its fine for trials. mark, i couldnt agree more, if i break any component on my bike, on all but a few parts, i wont send them back, ill just buy a new one, end of, no moaning or owt. cheers guys , matt