Originally Posted by
MikeyBoyAz
...my torque key is a Bontrager 4Nm, and the bars I was installing were Bontrager xXx... and it still cracked the bars... as for improper tightning... I just installed it like I would lugnuts on a car... crisscross at small 1/4 turn intervals... as for the stem being out of shape, the new bars went on like butter @4Nm with no prob... I would assume there are as many torque keys as there are torque ratings...
1/4 turn interval is way too much for tightening small bolts like that. On a 3mm bolt, you are moving .5mm/turn, so 1/4 turn is .125mm. Once everything is tight, 1/4 turn means you are deflecting your carbon bar clamp .125mm; you don't need many .125mm movements to crack something.
__________________
Cat 2 Track, Cat 3 Road.
"If you’re new enough [to racing] that you would ask such question, then i would hazard a guess that if you just made up a workout that sounded hard to do, and did it, you’d probably get faster." --
the tiniest sprinter