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Design Fault on Shimano XT Shadow Tech model RD-M781-SGS Rear Derrailleur


AngusC

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Sorry to go a bit off topic, madbradd which engineering discipline are you qualified for? I honestly never thought that there would be engineers on the bike hub. My materials science lecturer says he's done cycling up until last year which he just doesn't look like a person who cycled.

Lol. You'd be surprised just how many different professions are practiced by hubbers. And how many of us don't "look like a person who cycles"

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There are probably more than 5000 of these RDs in SA alone and vastly more worldwide. No design fault. I have seen a few cases where people thread the chain incorrectly. A few months ago there was a novice hubber complaining that his chain had actually worn through the tab on the derailer cage.....I remember being impressed by his patience and perseverence for cycling with so much noise and friction in the drive train and thinking it normal ????

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Sorry to go a bit off topic, madbradd which engineering discipline are you qualified for? I honestly never thought that there would be engineers on the bike hub. My materials science lecturer says he's done cycling up until last year which he just doesn't look like a person who cycled.

I'm an electrical engineer, and my "cycling group" from work consists of mechanical, electrical, civil, process, and specialist winder engineers. Another cycling mate of mine is an aeronautical engineer.

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I'm an electrical engineer, and my "cycling group" from work consists of mechanical, electrical, civil, process, and specialist winder engineers. Another cycling mate of mine is an aeronautical engineer.

 

Can you imagine cycling with this group?

 

Can you imagine the "discussion" when a cycling topic gets brought up?

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Can you imagine cycling with this group?

 

Can you imagine the "discussion" when a cycling topic gets brought up?

And when somebody makes a super intellectual comment like "The design fault is that it allows you to install it wrong. A good design would not allow the uneducated mechanic the chance to get it wrong."

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I'm an electrical engineer, and my "cycling group" from work consists of mechanical, electrical, civil, process, and specialist winder engineers. Another cycling mate of mine is an aeronautical engineer.

I imagine that must be your "cycling group of bastion" where it's the engineers v.s the rest.

 

Can you imagine cycling with this group?

 

Can you imagine the "discussion" when a cycling topic gets brought up?

I know right, I mean the kind of "discussions" I have with my friends over certain things is beyond me and we aren't even engineers yet.

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My only comment on this as an engineer is that you can often learn something from the greasiest, grubbiest hard workingist heavy plant mechanic who will find R 10 000 solutions the teutonic humourless plant designer never contemplated and wants to sell you a million ZAR's worth of spares to maybe, possibly fix.

 

Somewhere the definition of an engineer is someone who can do for one pound what any damn foo can do for four pounds (and it may be guineas, not pounds)..

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And when somebody makes a super intellectual comment like "The design fault is that it allows you to install it wrong. A good design would not allow the uneducated mechanic the chance to get it wrong."

We call these people" lawyers" ;-)

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And when somebody makes a super intellectual comment like "The design fault is that it allows you to install it wrong. A good design would not allow the uneducated mechanic the chance to get it wrong."

An uneducated mechanic is not a mechanic.....and us engineers can only dumb it down so far. There is a level at which the user must take responsibility. [emoji12]
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Can you imagine cycling with this group?

 

Can you imagine the "discussion" when a cycling topic gets brought up?

Sheldon comes to mind... :lol:  :lol:

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My only comment on this as an engineer is that you can often learn something from the greasiest, grubbiest hard workingist heavy plant mechanic who will find R 10 000 solutions the teutonic humourless plant designer never contemplated and wants to sell you a million ZAR's worth of spares to maybe, possibly fix.

 

Somewhere the definition of an engineer is someone who can do for one pound what any damn foo can do for four pounds (and it may be guineas, not pounds)..

Because every engineer needs a mechanic...

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