Chain jam between crank and big ring

Art Harris said:

When I got all done, I realized that the original 52T big ring has a small, round peg that threads
into the ring to prevent the chain from getting jammed between the ring and the crank. The 47T
that used to be the middle ring on my wife's bike (now the big ring) doesn't have a threaded hole
to accept the peg.

Should I be worried about this?

no

Quoted message said:

How likely is it that the chain will get jammed between the ring and the crank.

Quite unlikely provided the front der. is adjusted properly. Many outer rings do not have this
little peg or, depending on the crank arms used, it does not sit in the right position (eg. Chorus
vs. Record cranks).

Guenther

n2ah-<< When I got all done, I realized that the original 52T big ring has a small, round peg that
threads into the ring to prevent the chain from getting jammed between the ring and the crank.

Quoted message said:

Quoted message said:

<BR><BR> << The 47T that used to be the middle ring on my wife's bike (now the big ring) doesn't

have a threaded hole to accept the peg. >><BR><BR> << Should I be worried about this? How likely is
it that the chain will get jammed between the ring and the crank. Is it a big deal if it does?

Quoted message said:

Quoted message said:

<BR><BR>

With a little shifting finesse, like reducing the pedal pressure whilst shifting on the front rings,
and you will not have a problem.

Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302
(303)440-3535 vecchios.comvecchios.comOpen ↗ "Ruote convenzionali costruite eccezionalmente bene"

Art Harris said:

Should I be worried about this?

No

Quoted message said:

How likely is it that the chain will get jammed between the ring and the crank.

How likely is the bike to be ridden with the derailleurs way out of adjustment? Keep the derailleurs
adjusted, and replace the chain when it needs to be, and you will be OK

--

David L. Johnson

__o | I don't believe you, you've got the whole damn thing all wrong. _`\(,_ | He's not the kind
you have to wind-up on Sundays. --Ian (_)/ (_) | Anderson

On 11 Dec 2003 04:53:40 -0800, [email hidden] (Art Harris) may have

Quoted message said:

Should I be worried about this? How likely is it that the chain will get jammed between the ring
and the crank. Is it a big deal if it does? I'll be using a narrow 9-speed chain.

Is a bash guard for that bolt circle available at the lbs? That would most likely solve the problem.

If the rider is known to be technically savvy and able to cope with minor foibles of machinery, then
don't worry too much about it. If the rider is a "grab it and go" person who pays little attention
to the mechanics of the assembly as long as it works, I'd say it might be wise to drill and tap the
needed hole in the ring, and put a peg there. In my experience, it's not difficult to do this; I
accomplished it in one case by simply putting a tapped hole where it was needed, stacking small
washers under the head of a screw, liberally loctiting the whole mess into place, and then using the
Dremel to shave the end of the bolt off flush on the other side. It might be a challenge if you have
to do it to a hardened chain ring, but the two rings I did were both very easily drilled. (A third
had too little web in the needed area; it got a bash guard instead.)

Consider the time that would be spent putting the peg in now balanced against the time that might be
spent later both unjamming the chain (messily) and listening to the gripes should the chain do a
Louganis at the wrong time. On the other hand, if the crank's design would just leave the chain
freely hanging and unjammed, then it might be less of a concern.

--
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I wouldn't worry about it at all. If everything is adjusted ok, it won't happen.

If you must have the pin, the pin/screws that hold together Shimano cassettes are perfect. You tap a
small hole and screw one of these in that has been shortened accordingly.

A punch, drill, tap, and hacksaw are a bunch of tools for a pin that is not needed.

Art Harris wrote: -snip- I realized that the original 52T big ring has a

Quoted message said:

small, round peg that threads into the ring to prevent the chain from getting jammed between the
ring and the crank. I checked, and all my other bikes have the same little peg. The 47T that used
to be the middle ring on my wife's bike (now the big ring) doesn't have a threaded hole to accept
the peg.

Should I be worried about this? How likely is it that the chain will get jammed between the ring
and the crank. Is it a big deal if it does? I'll be using a narrow 9-speed chain.

Necessary? Probably not, but why find out? It's easily drilled and tapped. Any small screw would do
the same job - it needn't be cute to be effective.

--
Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971