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@forms
Well, I haven't had *that *many issues.
But I have noticed that cheaper cranks will flex more - there is a noticeable difference between messengers and 75's for example.
Also, I found that cranks bolts often loosened on cheaper sets (and yes I had been tightening them to the correct torque). The problem with the loosening is that you have to re-tighten, which pushes the cranks further onto the spindle, which rounds the cranks taper. This leads to creaking, and eventual failure.
The bike which I run 75's on was out of action for 6 months, so I was mainly riding a bike with messengers. When I got back on the 75's after all that time, it was great.
The 3 sets I have on my bikes now are:
Dura Ace 7600's (hopefully arriving in the next few days).
Sugino Grand Mighty Competition
Sugino 75.