Assess rear wheel bearings - tight?

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SimonDk
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Assess rear wheel bearings - tight?

#1 Post by SimonDk » Tue Feb 18, 2014 9:59 pm

Hi
- No play or knocking while the wheels were on the bike. No heat after riding. But as I have wheels off for tyres, I felt the bearings. They turn smoothly by hand; no grating - but in the rear wheel just about possible, very 'firmly' indeed. The guy who changed the tyres (not a pro mechanic) did find them unusually tight too ... But how much is too much? He speculated they might be pressing slightly against the inner spacer .. possible or rubbish?
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GregD-UK
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Bearing...

#2 Post by GregD-UK » Wed Feb 19, 2014 12:06 am

Hi all,

Looks like bearings ok. See the little half circle cut-out on the spacer, you can use a 3/4mm punch to knock the bearing from the other side to give it a small nudge up if you think they are too tight. Personally, I would just grease the bearings and check that they sit flat. They may be new, therefore quite tight when turned by hand.

Just check the next time you need a tyre change :smt002
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Re: Bearing...

#3 Post by SimonDk » Wed Feb 19, 2014 8:07 pm

GregD-UK wrote:would just grease the bearings
Thanks. With what and how, exactly?
- Bike specific Pedros Synthetic Grease is OK?
- The black rubber ring between the races is a seal and can be pryed off with a screwdriver to apply grease inside - or?
'00 Falco fire red w/35.000km. New to me in '12.

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#4 Post by D-Rider » Wed Feb 19, 2014 8:10 pm

I use Castrol LM grease for things like this
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Re: Bearing...

#5 Post by mangocrazy » Wed Feb 19, 2014 8:11 pm

SimonDk wrote:- The black rubber ring between the races is a seal and can be pryed off with a screwdriver to apply grease inside - or?
I'm sure it can, but I wouldn't. The bearings are pre-packed with grease from the factory, and the seals are there to resist contamination and fling of the grease.

It may just be the initial static friction from the seals that is making the bearings feel tight, of course... ?

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#6 Post by blinkey501 » Wed Feb 19, 2014 8:28 pm

If the bearings are as you describe refit the wheel and ride the bike :smt003
Tolerance will be our undoing.

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Re: Bearing...

#7 Post by SimonDk » Wed Feb 19, 2014 8:31 pm

GregD-UK wrote:can use a 3/4mm punch to knock the bearing from the other side to give it a small nudge up if you think they are too tight.
I've come up with an right-angled, thick piece of "wire" inserted in the cut-out, which I can then hit outwards from the rear via a socket extension bar or similar. But it's hard to feel/judge how hard it's okay to hit it? The feeling is quite solid, not like somthing is about to give..

The bearings have at least 6000 km on them, likely more. - That's how long i've had the bike, so surely they are not "new" ?
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GregD-UK
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Bearings...

#8 Post by GregD-UK » Wed Feb 19, 2014 8:38 pm

Hi all,

Thank you for the more detailed information. If they have been used for over 6,000 Kms then they are surely working ok. I normally grease my spindle a small amount to reduce the wear throughout the contact area in the wheel. I don't bust open any bearings I might point out. The olde saying is true here; "If it ain't broke, don't fix it!"

Just keep an eye on the wheel every now and then. Do the simple bearing test that MOT guys do :smt002
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#9 Post by D-Rider » Wed Feb 19, 2014 9:24 pm

Ah yes - read this a bit quick. I'd not be pulling sealed bearings apart.
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#10 Post by D-Rider » Wed Feb 19, 2014 9:25 pm

Ah yes - read this a bit quick. I'd not be pulling sealed bearings apart.
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#11 Post by mangocrazy » Wed Feb 19, 2014 10:12 pm

Not even once... :smt003

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#12 Post by SimonDk » Wed Feb 19, 2014 10:54 pm

Gotcha. Will leave it alone and be happy ... thanks, all.. :smt004
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#13 Post by D-Rider » Wed Feb 19, 2014 10:59 pm

mangocrazy wrote:Not even once... :smt003
:smt053
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#14 Post by plasticpig72 » Thu Feb 20, 2014 5:54 pm

You have two options, repacking them isn't one of them. Personally I would leave them alone with that low milage, mine were wrecked when I bought my bike, but it had done some 14000 miles and they had obviously welded to the spindle at some point, but the garage that had the bike still didn't replace them. If you are concerned they are not that expensive to replace anyway.

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