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Old 08-22-2009, 12:20 PM   #61
johngil OP
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Here is the stock shock for comparison.



Here is the Ohlins w/ from a couple of views. One bushing is removed.





This is the bushing Bruno T mentions.



Stock shock, new bolt, bent cross tube.



Ohlins after 400 + miles.



Ohlins after 175 miles.



Again, I will point out that the initial bent bolts started w/ the stock shock.
This is evident when looking through the steel bushing. It is oblong.

The Hyper pro mounting looks similar to the Ohlins. It is impossible to see from the photos how the Hyperpro bushing is constructed.

This sure is fun. My bike is just sitting there, all alone @ the dealer right now. She gave me some sad looks yesterday. I feel like such a bad bike parent. I should seek professional help.
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Old 08-22-2009, 12:23 PM   #62
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Hi Klaus from Germany.
Dont worry, your english is fine and much better than my German !
Well. Im not sure about that. I was able to torque mine to 100nm without trouble.
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Old 08-22-2009, 12:33 PM   #63
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The Hyper pro is a 1 solid piece pressed in the shock. Does that mean anything John ?
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Old 08-22-2009, 12:37 PM   #64
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trouble to torque the upper bold to 100nm

thanks for the fast answer

is there anybody who has trouble to torque the upper bold to 100nm?

thanks for your repleys

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Old 08-22-2009, 01:50 PM   #65
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I am no BMW owner but I used to graduate university (6 years) and work as mechanical engineer. Since that time I worked on hundreds of bikes as hobby - my friends, guys stayed in my place travelling further RTW and to Europe...
This design is flawed for sure by any means of engineering. No other bike I worked on or seen ever had this strange design for upper mount.
If you want to talk about it first check (not sure it is correct English terms) bending resistance of bolt of that diameter, 12.9 grade (which stock bolt isn't) in similar assembly. I also do not understand how stock shock does not have bearing in upper joint if they recommend to tighten bolt to 100 Nm and shock expected to move. This is cost saving shortcut, nothing to do with engineering.
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Old 08-22-2009, 01:56 PM   #66
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Quote:
Originally Posted by bluesman
I also do not understand how stock shock does not have bearing in upper joint if they recommend to tighten bolt to 100 Nm and shock expected to move.

I may be wrong, but I believe one of these spacers goes on either side of the shock eye.



The small bit goes in the shock eye and touches the small bit from the other side, so when you compress the bolt the compression load isn't going into the shock but instead into the shaft that these two bushing butting against each other make. The shock appears to have a bushing/bearing surface to turn on.

My question, is it verified that these bushings touch in the center while on the Ohlins shock, or do they leave a gap in the middle meaning that the compression load of the bolt is being transfered to the shock eye. Or even do both bushings fit into the Ohlins shock without any interference with the shock eye or area around it?
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Old 08-22-2009, 01:57 PM   #67
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It seema many "cost saving short cuts" were taken. Which is very absurd for this price point bike.
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Old 08-22-2009, 02:06 PM   #68
johngil OP
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Gramps, there is a small gap between the spacers.
The spacers, bushings, or whatever you want to call them get ruined every time the shock bolt bends.

I have been ordering shock bolts by the handful. I was told by Ohlins to have the spacers made by a local machine shop.

It seems the gap would be a starting point for the bolt to bend. On the other hand, The bolt bends in the same spot w/ the stock shock w/ a solid steel bushing. It is surrounding by some rubber, like a car shock made by Monroe.

I need more beer.
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Old 08-22-2009, 02:12 PM   #69
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Quote:
Originally Posted by johngil
Gramps, there is a small gap between the spacers.
The spacers, bushings, or whatever you want to call them get ruined every time the shock bolt bends.

I have been ordering shock bolts by the handful. I was told by Ohlins to have the spacers made by a local machine shop.

It seems the gap would be a starting point for the bolt to bend. On the other hand, The bolt bends in the same spot w/ the stock shock w/ a solid steel bushing. It is surrounding by some rubber, like a car shock made by Monroe.

I need more beer.
If there is a small space I would think that this would transfer twisting from the shock movement to the bolt since now the bolt and the shock would be tightened against one another.

I bet if you put the spacers in the stock shock there would be no space between them inside the shock eye. Which would mean the shock could pivot without affecting the bolt.
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Old 08-22-2009, 02:12 PM   #70
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The bending bolt is a result of the hole that holds the gold colored piece becoming elongated. Check the photo.
As Joel stated, once there was a failure, nothing will stop future failures.

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Old 08-22-2009, 02:15 PM   #71
kmueller_gs12
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hi JoelWisman
thanks for your answer, i will try it tomorrow afternoon and give a feedback later

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Old 08-22-2009, 02:17 PM   #72
johngil OP
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[quote=Gramps]If there is a small space I would think that this would transfer twisting from the shock movement to the bolt since now the bolt and the shock would be tightened against one another.

I bet if you put the spacers in the stock shock there would be no space between them inside the shock eye. Which would mean the shock could pivot without affecting the bolt.


The stock shock (as pictured) is a different design. When I bent the first bolt, the spacer/bushing elongated. It isn't visible in the photo.
In both cases, the shock and mounting hardware are all bound together and torqued
to 100nm. The Ohlins set up used a swivel, while the stock shock relies on some rubber.

johngil screwed with this post 08-22-2009 at 02:54 PM
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Old 08-22-2009, 02:21 PM   #73
Boon Booni
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Quote:
Originally Posted by johngil
The bending bolt is a result of the hole that holds the gold colored piece becoming elongated. Check the photo.
As Joel stated, once there was a failure, nothing will stop future failures.

I'd be willing to bet that the elongated hole is a product of the failure of the bolt. Perhaps it failed on the stocker due to improper torque, and is now failing on the ohlins because the spacers aren't allowed to bottom out against one another transfering compression load to the shock eye and allowing the twisting movement of the shock to turn the bolt as well.
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Old 08-22-2009, 02:23 PM   #74
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Gramps, the spacers bottom out against the swivel on the Ohlins. (shown from the opposite side)




johngil screwed with this post 08-22-2009 at 02:32 PM
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Old 08-22-2009, 02:55 PM   #75
Boon Booni
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Quote:
Originally Posted by johngil
Gramps, the spacers bottom out against the swivel on the Ohlins. (shown from the opposite side)




Got ya. So the shock is allowed to move independently of the bolt and bushings.

Ah well, I tried.
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