I had the same issue. This is how I fixed the noise and the problem of bearing cap bolts working loose. It took a few iterations to get the thickness of the washers just right but have had no noise or loose bolts since. Also no loctight needed on the bolts.
Jim
Hey Jim,
had the same issue on my Muni. Did the same modification to all my unis then. Got me some shims in different thickness (0,1 0,2 0,5 1,0 mm). By using them it is easy to adjust the proper thickness. I use a spare bearing and put it into the frame for adjusting. Much easier handling then the wheelset. Then turning it by hand (actually a finger) it is easy to find the point where it starts to be deformed.
Went riding today. Cranks are holding tight !
Still i wonder if my isis spline is undersized ? Snugging the crank arm by hand and the bolt only have a tiny 1 mm shoulder that it can push deeper on the crank. Installing those same crank on my other unicycle and even a bicycle isis hub when I put it snug by hand it still have a 3-4mm shoulder to be press by the bolt. That could be why I had to make my spacers 4mm instead of the original 7mm ? I’ll check with the caliper tomorrow.
Pierluc,
It would be interesting to see if your axle is under sized. Here is a drawing from the standard:
A bit undersized compare to my bicycle hub, but quite similar to my other nimbus hub that is working fine with 7mm spacers and same crank 
Ill put locktite on that isis screw and stop worrying about it.
Isis bolts are still loosening after a long ride , never need a crank puller to get the cranks out 
I dont think i can shave my spacers more than that because my isis bolt dont have much to push on the crank arms already. Didnt loctite yet.
Even trying cranks on without spacers on either size, crank snug by hand can only get .5 to 1mm maximum of press fit from the bolt ( same result with 3 pairs of venture 2 cranks that i have ) Waiting for answers from municycle.ca
Pierluc,
Did you measure your axle at section B-B of the above drawing. This measurement would tell you if the taper is correct on your axle. The measurement should be 17.412 to 17.464mm at a point 9mm out from the male shoulder.
Your measurements are within the spec if they were taken about 2mm from the end of the axle but that is only half the story.
After using loctite on the isis bolt and tightening it really hard, it seems to hold better but still loosen after a while. Municycle is sending me a pair of VCX crank and different size of washers to try. Aparently those cranks hold more tight on the axle. Cant wait to be riding without hassle 
Its a great ride other than that!
I’ve got a 36 Oracle with an aluminum hub (a few years old now). A few weeks after I bought it, the unicycle starting making a constant squeaking noise when pedaling but I gave up trying to work out where it came from a long time ago.
I’ve also got the ongoing problem with the cranks being quite loose on the hub (maybe because of the aluminum hub). I’ve tried both KH and venture cranks. I recently bought some VCX cranks and they definitely fit much tighter than the other ones. Hopefully they will stay that way for a long time. By the way my VCX cranks are the multihole ones (three holes) and they are great!
Sure LBJ! I was already in a bad mood for other reasons and it fueled the rant. I was really torqued about the culture of gullibility in the US and the failure to appreciate good inferential habits and principles. The irritation latched on to the matter of finding unicycle creaks which, at least, provide clear feedback to the experimenter (unlike most social problems which are beset by ambiguous and complex feedback.) In other words, and as so often is the case, it was about me–I ruffled my own feathers…
A ride is definitely on order!
