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Front Rotor bolts

Jon_The_Bike_Man

Jon_The_Bike_Man

Just got it firing!
Joined
Jun 27, 2023
Messages
11
Location
Phoenix, AZ USA
I pulled off the front disc's to change tires, my first time so I didn't want to risk damaging them. When I removed the mounting bolts the threads had RED thread locker on them. Going to put them back on and the Service manual says Loc-tite 243 which is BLUE? Should I use what was there or follow the service manual?
 

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If you were able to remove those bolts WITHOUT HEAT FROM A TORCH, then they were not sealed with Red Loctite. Red Loctite absolutely requires a torch to make the threadlocker release. Without heat, you would have destroyed the heads of the bolts.

Blue (Medium) is the correct compound to use.

FWIW: Industry Standard Practice is to never reuse brake rotor bolts ever. This has always been my shop practice.

YMMV
 
I've never removed the disks to change a tire. (front.) But I haven't personally changed the tire on a wheel with floating disks before. (I'm willing to pay to have the tire changed, but I remove the wheel from the bike myself.) Is this a recommended procedure? (Never heard of it before.)
 
I had to change the front disc on my 2021 V7 850 Special (knackered bobbins at 3,500 miles with bike two months out of warranty🥵). I heated my disc retaining bolts in order to undo them without ruining the threads in the alloy hubs. I was contemplating buying used cast wheels off a Stone but the picture online showed that two of the six threads in the hub had been pulled out, probably by using an impact wrench, so I passed on that one. The six individually wrapped replacement bolts obtained from my local dealer each had threadlock already applied - IIRC it was red….
Personally given the risk of damaging the disc retaining threads in the alloy hubs I wouldn’t remove the discs for a tyre change. I don’t see why a competent professional tyre fitter should damage the discs - it’s never happened to me in the last four decades or so since my bikes had disc brakes. Also, I don’t see why floating discs should be more at risk than fixed ones or significantly affect tyre changing.
 
What?!?

You do not remove the disc rotors for tire mounting or balancing!

The pre-applied thread locker on the bolts, is not red loctite in the classical sense. Like I said, if it was liquid red, then it would absolutely require heat to break the bond. This would be very bad for the rotors.

I’m sure it is of “mechanical tools necessary” strength for removal, but definitely not red liquid strength.
 
scottmastrocinque said:
If you were able to remove those bolts WITHOUT HEAT FROM A TORCH, then they were not sealed with Red Loctite. Red Loctite absolutely requires a torch to make the threadlocker release. Without heat, you would have destroyed the heads of the bolts.

Blue (Medium) is the correct compound to use.

FWIW: Industry Standard Practice is to never reuse brake rotor bolts ever. This has always been my shop practice.

YMMV
Click to expand...
 
Actually I was surprised when I did remove the bolts to find blue threadlock on them; this suggests that the stuff on the replacements that I already had is indeed the same as the blue.

I don’t change tyres myself; I stopped when tubeless were introduced and sidewalls became much more rigid. The tyre fitters I use always balance the wheel, not just the tyre.

I forgot to mention in the previous post that having fitted the new disc, bolts and pads I thought I’d have a go at replacing the bobbins on the original disc, which was barely worn at all (nor should it be at that low mileage). It was found that the bobbins were all undersized (obviously a faulty batch). Unfortunately it was also found that the carrier and disc were worn enough to make it not worthwhile replacing the bobbins.
 
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