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Discussion Starter #1
I saw several topics about rear hub bearing failure. In fact, my B4 bearing collapsed below 10K Km.
Reading a lot of posts about that, people says that fail occurs due to an excessive torque (above 20Nm) at certain bolts, but I didn't realize which bolts are.
If one of you coud show me a photo or picture where I can see the bolts, or give me catalog number of these, I will apreciate.

Thanks in advance. My B4 is 910S 2008.

PS: Sorry, my english is very bad
 

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Chain adjustment seems to play a role, too.
 

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Discussion Starter #4
I will verify these bolts torque and chain adjustment, to avoid 2nd collapse

Thank you very much!
 

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In my opinion, and just checked mine again.Water does the damage.Tighten to 28nm and checked regularly.
If I where you a would consider a Mitchy hub.I never Wash my bike using Water.

cheers eddy
 

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If you are going to replace the bearing only use INA BEARING ,Now done 40,000 km and still going OK.Others will have different opinions.
 

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????

Eddy;

The only bearings that have failed are INA bearings......why use them????

I tested the torque values on the pinch bolts which collapse the rear hub and the

3810-2RS bearing.....I posted the results

Do not use more than 15lbft/20Nm to avoid the problem

It is NOT water ingress...... It is damp air getting sucked in as the hub cools...

It is always the inside of the inner race that rusts

How would people that have never gotten the bike wet have rust any other way?

I've sold over 1000 bearings with zero reported failures......

MV can't say that
 

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Noel,i can only go by what is put in my bike,INA bearing and still perfect ,always at 28nm ,chain is as per spec,i have the hole in the bottom of the hub and i use a lot of grease,first bearing went at 18000km and there was rust marks everywhere on it,now if there was moisture it certainly would have destroyed my second bearing by now ,also it would depend on what part of the planet you live in and yes then wet and moisture would definitely come into play.

cheers eddy
 

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Discussion Starter #9
In my opinion, and just checked mine again.Water does the damage.Tighten to 28nm and checked regularly.
If I where you a would consider a Mitchy hub.I never Wash my bike using Water.

cheers eddy
I was thinking about Mitchy Hub. But shipping cost to Brazil its very expensive, and now our currency have no value...
I have another parts to replace, I'm waiting for solution of political issues here to give more friendly exchange taxes :flat:

Thanks
 

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I looked at ceramic bearings,the cost is outrageous and they just look too lightweight for me.My engineer said don't waste your money.:wtf:
 

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Ralf;
at $145 each for a 6907-2RS they can keep them :stickpoke




:popcorn:
Well, Noel, I spend how much on CF, Mg, Ti, ...
Their bearings have a great reputation and why not give them a try.
Plus they will likely last the lifetime of my F4.
Considering I ride more with the Brutale nowadays.
Interesting on their webpage was for me some facts about bearings.
As I said lesser grease is reducing heat and rolling resistance for an example.
Or about the roundness of balls, 0,0001 tolerances for the assembly and with it the selection of balls.
What do I know but it sounds to me like they know what they do.
 
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