Well, the Sweet Wings cranks are now off the bike forever. And I have had my first bit of damage, though luckily, it is mainly cosmetic.
Out for a pleasant ride and the cranks started getting loose again. I snugged them up only to feel them coming loose a few miles later. The loctite appeared to not be working. A little further on though and I began to hear/feel some rubbing. At first I thought it was just the front derailleur rubbing the chainrings. But off the bike I couldn't see it rubbing and didn't hear it as I rotated the cranks. Then I thought, perhaps, the bottom bracket bearings had failed. I managed to get home but the rubbing had turned to grinding in the last mile and I just couldn't see from the saddle what the issue was. When I got home I discovered the inner chain ring had been grinding against the chainstay... right through the powdercoat and down to bare metal. And now I see the folly of the Sweet Wings cranks.
There is no retention mechanism for the bearings in the bearing cups. Each time the cranks came loose, I tightened them up slightly more. What I was actually doing was pressing the bearing right out of the cup. This drew the driveside crankarm into the bottom bracket and allowed the chainring to contact the frame.
So the Sweet Wings cranks are out and, for now, a set of FSA SLK cranks are installed. A modern Mega Exo bottom bracket has been installed with all the proper spacers. So, while I bit heavier than the original build, it will be more reliable. And, to be honest, the UD carbon cranks look pretty good on the bike.
I really wanted to love the Sweet Wings cranks. *sigh*
Yes, I was a ex-sweet wing MTB crankset user, the mean bolt loose every other month.
But the worst thing is the design of BB! the left side bearing can easily pop out to left side, well.....but the right side bearing did the same - pop into the frame serevel times! Maintenance time again.
Then I change back to Shimano again and again, trouble-free.