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Shimano chains - rivet reuse?



 
 
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  #1  
Old August 21st 05, 09:46 AM
Martin
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Default Shimano chains - rivet reuse?

The other day the mechanic at my local bike shop rejoined my Shimano 10
speed Ultegra chain reusing two rivets. Looking at the link under a
jeweler's magnifying glass I can clearly see that the peening on the
rivets is missing and I can see the countersinking in the plates around
the rivets.

The mechanic is very experienced, very well respected and services many
bikes in a busy shop. It looks like the rivets have been inserted to the
correct depth. Nevertheless the contact area between rivets and plate is
substantially less than it should be and the peeening that would prevent
the rivet moving is absent.

I am interested in readers' opinions and experience regarding the safety
and durability of this repair job. Do many people reuse rivets? Any
experiences of reused rivets working well? or failing?

Many thanks

Martin

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  #2  
Old August 21st 05, 12:39 PM
Lou Holtman
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Default Shimano chains - rivet reuse?

Martin wrote:
The other day the mechanic at my local bike shop rejoined my Shimano 10
speed Ultegra chain reusing two rivets. Looking at the link under a
jeweler's magnifying glass I can clearly see that the peening on the
rivets is missing and I can see the countersinking in the plates around
the rivets.

The mechanic is very experienced, very well respected and services many
bikes in a busy shop. It looks like the rivets have been inserted to the
correct depth. Nevertheless the contact area between rivets and plate is
substantially less than it should be and the peeening that would prevent
the rivet moving is absent.

I am interested in readers' opinions and experience regarding the safety
and durability of this repair job. Do many people reuse rivets? Any
experiences of reused rivets working well? or failing?

Many thanks

Martin


I would never ride with a chain rejoined with reused rivets. Even with 8
speed Shimano chains they say to rejoin them with a special pin. 10
speed chains have even thinner outer plates.

Lou
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  #3  
Old August 21st 05, 12:48 PM
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Default Shimano chains - rivet reuse?

Martin:

It used to be that you could use the existing rivet to close a chain.
In fact, it would be very difficult to replace a rivet since you could
not thread it through the whole. so, you would break the chain without
completely removing the rivet. That is how chains would work, until
shimano came up with the replaceable rivet. It was the stupidest idea
ever. Whenever you break a shimano chain, you must replace the rivet
with a special order shimano rivet. Otherwise, the chain will surely
fail. With SRAM chains, you can reuse existing rivets, or use the
special link that allows you to break the chain with no tools.

Andres

  #4  
Old August 21st 05, 06:34 PM
Zog The Undeniable
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Default Shimano chains - rivet reuse?

wrote:

With SRAM chains, you can reuse existing rivets, or use the
special link that allows you to break the chain with no tools.


Not any more. Their rivets are peened too.
  #6  
Old August 21st 05, 01:10 PM
RonSonic
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Default Shimano chains - rivet reuse?

On Sun, 21 Aug 2005 08:46:29 GMT, Martin wrote:

The other day the mechanic at my local bike shop rejoined my Shimano 10
speed Ultegra chain reusing two rivets. Looking at the link under a
jeweler's magnifying glass I can clearly see that the peening on the
rivets is missing and I can see the countersinking in the plates around
the rivets.


I guess I'm slow - why would he need to use two rivets to rejoin a chain? If he
opened the chain for service, that's one rivet - OTOH if he's repairing a broken
chain that's also one rivet.

Ron

The mechanic is very experienced, very well respected and services many
bikes in a busy shop. It looks like the rivets have been inserted to the
correct depth. Nevertheless the contact area between rivets and plate is
substantially less than it should be and the peeening that would prevent
the rivet moving is absent.

I am interested in readers' opinions and experience regarding the safety
and durability of this repair job. Do many people reuse rivets? Any
experiences of reused rivets working well? or failing?

Many thanks

Martin

  #7  
Old August 21st 05, 10:22 PM
Martin
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Default Shimano chains - rivet reuse?

RonSonic wrote:
On Sun, 21 Aug 2005 08:46:29 GMT, Martin wrote:


The other day the mechanic at my local bike shop rejoined my Shimano 10
speed Ultegra chain reusing two rivets. Looking at the link under a
jeweler's magnifying glass I can clearly see that the peening on the
rivets is missing and I can see the countersinking in the plates around
the rivets.



I guess I'm slow - why would he need to use two rivets to rejoin a chain? If he
opened the chain for service, that's one rivet - OTOH if he's repairing a broken
chain that's also one rivet.


The special pin that was originally used to join the chain had partially
come out leaving the chain joined by one plate of the link. This plate
was bent so the mechanic replaced one link and reused original rivets at
both ends. The first symptom I noticed was the chain coming off the
small ring (at low speed and moderate effort) on a hill. The mechanic
said he sees that kind of failure quite often in the special pins (which
are installed by the bike manufacturer, not by him).

Martin

Ron


The mechanic is very experienced, very well respected and services many
bikes in a busy shop. It looks like the rivets have been inserted to the
correct depth. Nevertheless the contact area between rivets and plate is
substantially less than it should be and the peeening that would prevent
the rivet moving is absent.

I am interested in readers' opinions and experience regarding the safety
and durability of this repair job. Do many people reuse rivets? Any
experiences of reused rivets working well? or failing?

Many thanks

Martin



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  #8  
Old August 21st 05, 02:03 PM
Qui si parla Campagnolo
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Default Shimano chains - rivet reuse?


Martin wrote:
The other day the mechanic at my local bike shop rejoined my Shimano 10
speed Ultegra chain reusing two rivets. Looking at the link under a
jeweler's magnifying glass I can clearly see that the peening on the
rivets is missing and I can see the countersinking in the plates around
the rivets.

The mechanic is very experienced, very well respected and services many
bikes in a busy shop.


BUT he made a serious mistake. BAD idea for any shimano chain, REALLY
bad idea for the 10s chain. He is asking for a broken chain, on a chain
that is known for breaking even when connected properly.


It looks like the rivets have been inserted to the
correct depth. Nevertheless the contact area between rivets and plate is
substantially less than it should be and the peeening that would prevent
the rivet moving is absent.

I am interested in readers' opinions and experience regarding the safety
and durability of this repair job. Do many people reuse rivets? Any
experiences of reused rivets working well? or failing?

Many thanks

Martin


  #9  
Old August 21st 05, 09:48 PM
Monty
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Default Shimano chains - rivet reuse?



He is asking for a broken chain, on a chain
that is known for breaking even when connected properly.



Really?
I have 23,332 miles on my DA10 and have not had a broken chain.
I do have it changed every 1,000-1,500 miles and that may help...


  #10  
Old August 21st 05, 11:14 PM
Robert Lorenzini
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Default Shimano chains - rivet reuse?

On Sun, 21 Aug 2005 20:48:41 GMT, Monty wrote:


He is asking for a broken chain, on a chain
that is known for breaking even when connected properly.



Really?
I have 23,332 miles on my DA10 and have not had a broken chain.
I do have it changed every 1,000-1,500 miles and that may help...



I decided to save the pin when I replaced my DA10 chain. Left me
by the side of the road within 200 mi. Been using the pin since
and no problems between chain replacement.

 




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