Loose Rotor and

"Westie" <[email hidden]> wrote in message "]news:[email hidden]...

Quoted message said:

I've got Hayes HFX9+ disc brakes and Mavis hubs. Have just discovered tonight that the rear rotor
slops around on the hub because the diameter

of

Quoted message said:

the 6 holes on the rotor are about 1mm larger than the diameter of the

rotor

Quoted message said:

mounting bolts. You can put the rear brake on and roll the wheel back

and

Quoted message said:

forth an inch or more at the rim. The rotor has 2mm play and rotates against the hub. I can't see
that tightening the bolts will help. As far as I can see,

what

Quoted message said:

I need is new rotor with the holes the correct size so that it mounts correctly in the first
place. I'll call the LBS where I got the bike in

the

Quoted message said:

a.m. but has anyone got thoughts on who should take responsibilty for this little gem of a stuff
up?
--
Westie (Replace 'invalid' with 'yahoo' when replying.)

All the rotors I have are like that. The hole is a bit bigger than the bolt, by about 1 mm. But I
never have had loose rotors. Take everything apart. Clean the hub/rotor interface with alcohol,
apply blue loctite to the bolts and torque them to 55in/lbs.

Mike

"Westie" <[email hidden]> wrote in message "]news:[email hidden]...

Quoted message said:

I've got Hayes HFX9+ disc brakes and Mavis hubs. Have just discovered tonight that the rear rotor
slops around on the hub because the diameter

of

Quoted message said:

the 6 holes on the rotor are about 1mm larger than the diameter of the

rotor

Quoted message said:

mounting bolts. You can put the rear brake on and roll the wheel back

and

Quoted message said:

forth an inch or more at the rim. The rotor has 2mm play and rotates against the hub. I can't see
that tightening the bolts will help. As far as I can see,

what

Quoted message said:

I need is new rotor with the holes the correct size so that it mounts correctly in the first
place. I'll call the LBS where I got the bike in

the

Quoted message said:

a.m. but has anyone got thoughts on who should take responsibilty for this little gem of a stuff
up?
--
Westie (Replace 'invalid' with 'yahoo' when replying.)

Yo Westie,

If the holes were the same size as the bolts you couldn't economically manufacture a rotor that
would fit together. There has to be some tolerance (a bigger hole) to allow for variation in the
manufacturing process. Tighten em up and go ridin'

--
DTW .../\.../\.../\...

I've spent most of my money on mountain biking and windsurfing. The rest I've just wasted.

Westie said:

I've got Hayes HFX9+ disc brakes and Mavis hubs. Have just discovered tonight that the rear rotor
slops around on the hub because the diameter of the 6 holes on the rotor are about 1mm larger than
the diameter of the rotor mounting bolts. You can put the rear brake on and roll the wheel back
and forth an inch or more at the rim. The rotor has 2mm play and rotates against the hub. I can't
see that tightening the bolts will help. As far as I can see, what I need is new rotor with the
holes the correct size so that it mounts correctly in the first place. I'll call the LBS where I
got the bike in the
a.m. but has anyone got thoughts on who should take responsibilty for this little gem of a stuff
up?

Perhaps your rotor bolts are longer than the tapped holes in the hub- do they bottom out before they
tighten against the rotor? All rotors have the slightly larger holes you mention. Still, they should
not be loose, like yours seem to be.

Miles

"Westie" <[email hidden]> wrote in message "]news:[email hidden]...

Quoted message said:

I've got Hayes HFX9+ disc brakes and Mavis hubs. Have just discovered tonight that the rear rotor
slops around on the hub because the diameter

of

Quoted message said:

the 6 holes on the rotor are about 1mm larger than the diameter of the

rotor

Quoted message said:

mounting bolts. You can put the rear brake on and roll the wheel back

and

Quoted message said:

forth an inch or more at the rim. The rotor has 2mm play and rotates against the hub. I can't see
that tightening the bolts will help. As far as I can see,

what

Quoted message said:

I need is new rotor with the holes the correct size so that it mounts correctly in the first
place. I'll call the LBS where I got the bike in

the

Quoted message said:

a.m. but has anyone got thoughts on who should take responsibilty for this little gem of a stuff
up?
--
Westie (Replace 'invalid' with 'yahoo' when replying.)

As the others are telling you, your setup isn't right but the hole sizes are not the issue. No
way you should have the rotor moving that way, though, so get it checked out. Make the shop show
you WHY it is allowing play. Once the rotor is fitting properly, bolts correctly installed and
tightened, it should be AND STAY as solid as a rock. No movement ever developed on any of my
Hayes rotors, either the first set of wheels with Formula hubs, nor the second set with XT hubs,
for nearly 3 years now. I don't think I even used any loctite on them, either.
--
Off to ride the mountains, D H Reply to newsgroup. Spam is out of control.

"D H" <[email hidden]> wrote in message
"]news:[email hidden]... <snip>

Quoted message said:

As the others are telling you, your setup isn't right but the hole

sizes

Quoted message said:

are not the issue. No way you should have the rotor moving that way,

though,

Quoted message said:

so get it checked out. Make the shop show you WHY it is allowing play.

Once

Quoted message said:

the rotor is fitting properly, bolts correctly installed and tightened, it should be AND STAY as
solid as a rock. No movement ever developed on any

of

Quoted message said:

my Hayes rotors, either the first set of wheels with Formula hubs, nor the second set with XT
hubs, for nearly 3 years now. I don't think I even used any loctite on them, either.

Thanks everyone. I would never have guessed it - holes too big is good, eh? I don't think that the
blue loctite locks - it's only on the very end of the bolts. The bolts don't bottom out. I'd guess
that it's just improper setup during the assembly of a new cookie-cutter bike. I'll take them off,
clean them and tighten them up and see what happens. Something that just occurred to me was that the
last ride was their first major downhill. Maybe the heat loosened the rotors up?
--
Westie (Replace 'invalid' with 'yahoo' when replying.)

Quoted message said:

Thanks everyone. I would never have guessed it - holes too big is good,

eh?

Quoted message said:

I don't think that the blue loctite locks - it's only on the very end of

the

Quoted message said:

bolts. The bolts don't bottom out. I'd guess that it's just improper setup during the assembly of
a new cookie-cutter bike. I'll take them off, clean them and tighten them up and see what happens.
Something that just occurred to me was that the last ride was their first major downhill. Maybe
the heat loosened the rotors up?
--
Westie

Heat won't loosen them. Your first guess is probably correct, incorrect setup from factory/dealer.
Use a torque wrench to install the bolts and you'll never have a problem with them.

BTW, I only use grease on bolt threads... never had a problem.
--
Slacker

"Slacker" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Quoted message said:

Thanks everyone. I would never have guessed it - holes too big is good,

eh?

Quoted message said:

I don't think that the blue loctite locks - it's only on the very end of

the

Quoted message said:

bolts. The bolts don't bottom out. I'd guess that it's just improper setup during the assembly
of a new cookie-cutter bike. I'll take them off, clean them and tighten them up and see what
happens. Something that just occurred to me was that the last ride was their

first

Quoted message said:

Quoted message said:

major downhill. Maybe the heat loosened the rotors up?
--
Westie

Heat won't loosen them. Your first guess is probably correct, incorrect setup from factory/dealer.
Use a torque wrench to install the bolts and you'll never have a problem with them.

BTW, I only use grease on bolt threads... never had a problem.

I learned the hard way.....properly torque anything with threads. I've got a ft-lb, and in-lb wrench
in my box.

"Mojo Deluxe" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

"Slacker" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Quoted message said:

Thanks everyone. I would never have guessed it - holes too big is

good,

Quoted message said:

Quoted message said:

eh?

Quoted message said:

I don't think that the blue loctite locks - it's only on the very end

of

Quoted message said:

Quoted message said:

the

Quoted message said:

bolts. The bolts don't bottom out. I'd guess that it's just improper setup during the assembly
of a new cookie-cutter bike. I'll take them off, clean them and tighten them up and see what

happens.

Quoted message said:

Quoted message said:

Quoted message said:

Something that just occurred to me was that the last ride was their

first

Quoted message said:

Quoted message said:

major downhill. Maybe the heat loosened the rotors up?
--
Westie

Heat won't loosen them. Your first guess is probably correct, incorrect setup from
factory/dealer. Use a torque wrench to install the bolts and you'll never have a problem
with them.

BTW, I only use grease on bolt threads... never had a problem.

I learned the hard way.....properly torque anything with threads. I've got

a

Quoted message said:

ft-lb, and in-lb wrench in my box.

It is VERY important to use a torque wrench on rotor bolts. Too loose and you have Westies Syndrome
;^) and too tight and the Torx will strip out and the bolt won't come out without a fight (Marks
Syndrome). 55in/lbs holds fast and releases when you want it to. It's also very good practice to use
the torque wrench on other fasteners on your bike.

Mike - Mark is a friend of mine, I help work on his bikes.