Well basically , i've had these cranks for a good year or so , and until about a month ago they started to make awful sounds as i was pedaling. And especially when i put my weight onto my pedals. and every time i ride now , the left crank arm comes loose , to the point where it's impossible to pedal. And in some cases , the crank falls off. And i've iv'e tried tightening it up , but after a mile of riding , it comes loose again ..
i know that truvative cranks have a nasty habit of coming loose. So is there anything i can do to prevent this from happening , or is it just a case of getting new cranks completely ?
Cheers.

yeah mine ddid this aswell, and alot of other people ahev the same problem.
All i done is put some of this badboy on the axle http://www.hemmingsdiy.co.uk/quickste.htm
And now I have a 2 peice crank.
Sorted.

Well yeah . i have tightened it up as hard as i can. to the point where it won't budhe anymore. Do you think getting a new lock ring will do the job ?

Yeah mine on my cowan do this...

^^^^ the above solutions for the loosening issue probably wont work, apparently its a design flaw and they all end up doing it

I remember my old truvativs!

they were amazing...until 2 rides from new i killed the BB.....

o well..they make interesting door handles.

Z

I had this problem.. needed a new bb. Been fine since *touch wood* the. In the old one the bearings were smashed apart and the bearing cages were just no more!