On Tuesday, June 30, 2020 at 9:35:48 AM UTC-7, AMuzi wrote:
On 6/30/2020 10:59 AM, wrote:
On Tuesday, June 30, 2020 at 8:46:01 AM UTC-7, Lou Holtman wrote:
On Tuesday, June 30, 2020 at 4:29:59 PM UTC+2, wrote:
On Tuesday, June 30, 2020 at 1:04:04 AM UTC-7, James wrote:
On 29/6/20 4:24 pm, Tosspot wrote:
On 29/06/2020 02:06, jbeattie wrote:
On Sunday, June 28, 2020 at 2:41:57 PM UTC-7, AMuzi wrote:
There's a lot wrong here but the flopping disc and loosened bolts
have worn into the fork casting.

http://www.yellowjersey.org/photosfr...t/faildisc.jpg

Could be a great advertisement for earbuds!

Wow, even with earbuds, how do you not feel that? I use loctite on my
six-bolt rotors or the factory supplied thread-locker on rotor
bolts.

I've never come cross the idea that people *don't* use a drop of
LocTite Blue on them. One of the few (only?) places I use thread lock.

I admittedly have not been using disc brake equiped bikes for many
years, but I haven't had any rotor bolts come loose either and I don't
bother with thread goop. I just nip them up tight. I think I would
notice fairly quickly if they came loose and I always carry a multi tool
so I could easily tighten the bolts while I am out.
Wear on the disk cause vibration that can counter-rotate the screws out. It may be likely that you look often enough at your bike to catch if but proper torque is not "nipping it up. As Andrew's picture demonstrates.

Every 6 bolt disk I bought came with screws with that blue goop on. Every centerlock disk I bought came with a lockring. If you torque the screws or lockring to spec the disk don't come loose.

Lou

While I agree with your comments via the locktite compound, how do you "torque" the center ring properly? Mine came with a plastic tool that you hand-tightened.


Did you observe the torque rating? A plastic tool is
sufficiently robust for that. In an engineering sense,
Centerlock is a better design than six bolt as the lockring
doesn't bear braking forces.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

The reason I got rid of mine was because the splines were on an aluminum freewheel like assembly and just like cheap cassettes the disk pushed grooves into the aluminum. The 6 bolt setup gave me no problems since those groves would allow the disk to walk back and forth and made a "CLACK" each time you applied the brakes.