Get The Sandwiches Ready - GSA Rear Wheel Collapse

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GrinningGSer said:
It has a rubber cap on the left and a metallic end on the right: very very close to the disk !
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Looks like the rubber cover on the caliper over the sliding pin, as the pads wear the caliper moves on the slide and the rubber cover moves away from the disc with the caliper body, it will be at its closest with new pads.
 
GrinningGSer said:
Smogbob, aren’t those the pad retaining pins ?
I am now not sure what I am referring to , but what is this arrowed and very close to the disk ?
i-26FNwNh-M.jpg
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Looks to me like some sort of safety rubber so if pads get to worn down, you do not get metal against metal, I could be wrong.
 
Smogbob said:
Looks to me like some sort of safety rubber so if pads get to worn down, you do not get metal against metal, I could be wrong.
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Its a floating caliper, that is one of two slides that it moves on.
Push your pads back and you will see that the calliper will then move from side to side, don't forget to pump the foot brake to reset the pads after.
You can take the rubber caps off and lube the pins while you are playing in there.
 
Smogbob said:
Looks to me like some sort of safety rubber so if pads get to worn down, you do not get metal against metal, I could be wrong.
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You are wrong - no safety device to prevent metal to metal contact when the pad material wears out 🤣

It's just a rubber cover on the sliding pin to prevent crud getting in on the sliders - need checking regularly as they perish and split - so need replacing periodically

Every floating caliper has them

Nothing new or unique - how many bike calipers have you worked on before?
 
Deleted account 181015001 said:
Nope, but very funny. :beerjug: :blast
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Yep was just a guess, obviously will not answer 32000+ posts, irrelevant person, however, as to taking to bits calipers, must admit, never once had a problem with a caliper to the point it needed taking to bits, just the odd one that needed a tad of brake cleaner, but no need to take apart.
 
Smogbob said:
Yep was just a guess, obviously will not answer 32000+ posts, irrelevant person, however, as to taking to bits calipers, must admit, never once had a problem with a caliper to the point it needed taking to bits, just the odd one that needed a tad of brake cleaner, but no need to take apart.
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It's called maintenance ... to strip and inspect calipers annually including the sliders
 
Just a thought, but say new pads were not correctly fitted or the retaining pins came out such that the pads got thrown out of the caliper, would it then be possible for any part of the caliper to have excessive freedom of movement and thereby hit the spokes?
 
Possibly unrelated -you decide.
Just back from 2500miles around Picos and Pyrenees.
Bikes were Mainly BMW, including a 2 week old GSA.
On returning, the youngest GSA was found to have a rattly rear wheel with many of the spokes loose. New wheel being fitted.
Everyone else checked their respective wheel (three other spoked bikes on trip) and no problem found.

What could have caused this? - one or two spokes going flat is perhaps understandable over time but for a brand new bike to suffer this is perhaps a reason to review manufacturing process or at least qc procedures
 
Popell said:
Possibly unrelated -you decide.
Just back from 2500miles around Picos and Pyrenees.
Bikes were Mainly BMW, including a 2 week old GSA.
On returning, the youngest GSA was found to have a rattly rear wheel with many of the spokes loose. New wheel being fitted.
Everyone else checked their respective wheel (three other spoked bikes on trip) and no problem found.

What could have caused this? - one or two spokes going flat is perhaps understandable over time but for a brand new bike to suffer this is perhaps a reason to review manufacturing process or at least qc procedures
Click to expand...

Who knows but it is scary shit, totally agree piss poor QC somewhere, and looking at the pictures of how the bike was loaded in the beginning of this thread, could it have been a total wheel collapse that has been tearing the calipers from their mounts, and not the bolts issue, pretty happy I have alloys now, just need to avoid big pot holes.
 
Interesting point

We asked BMW if the spoked rims are as strong as the previous model and they are adamant they are and dismiss claims that a new designed rim is on its way. However, they do agree the rims may be more vulnerable to impact because of the lower profile and softer construction of the tyres.
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I knew something was niggling at me about this thread and then I stumbled across this. Anything sound familiar?!:augie

http://www.ukgser.com/forums/showthread.php/343199-GSA-30th-Anniversary-Accident?highlight=gsa%20caliper%20wheel%20spokes
 
I've another thought on this....

What if its a combination of things.

A) Starts off with a loose spoke
B) Rider style uses a 'snappy' throttle for low revs excelleration, using the bikes torque rather than high revs.
C) Large torque force is applied to spoked wheel on and already overloaded heavy bike
D) This overstresses other spokes around loose one, stretching them? to become lose themselves.
E) Which, over time continues until total collapse.

If so, not checking your spokes will leave you unaware of this.

Remapping your bike with higher torque levels, and using a lazy accelleration style might impact this more
 
Nippy Normans supply Touratech, Wunderlich, Desert Fox and many other makes of accessories.
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