derailleur hangers - bends on its own???

(wle) may have said:

so what makes rear derailleur hangers bend?

yesterday i noticed my indexed gears were no longer indexed.

the chain was jumping between gears.

tried to shift to lowest gear, didn;t get all the way before the idler wheel started hitting
spokes, backed out of that before too late.

got home, the derailleur hanger was bent.

but - no crash, nothing happened.

Under similar circumstances earlier this year, I had a bent hanger after a bike did much the same
thing...but the problem in that case was that the der had not been properly serviced by the lbs that
had just seen it, and the pivots were *very* stiff due to old, congealed lube. I don't recall the
exact sequence of events, but the result was the same; went for low gear, got spokes.

Check the freedom of motion of the der pivots with the bike at outdoor riding temp. If any are
binding or sticking (which could easily be precipitated by cold weather) then you've found
your cause.

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Quoted message said:

Check the freedom of motion of the der pivots with the bike at outdoor riding temp. If any are
binding or sticking (which could easily be precipitated by cold weather) then you've found
your cause.

no, it had been colder in the morning.

no recent work on the bike.

what i am asking is, is there any shift-related event that can bend the derailleur hanger?

i mean, the worst you could do would be to go crank on a shifter without pedaling, or pedaling
slowly, the chain could get at a weird angle, with that plus a lot of pedal pressure, would that
lone bend the hanger?

i have read that, nothing bends them but a crash, yet i have had mine bent at least 3 times, no
crashes. normally i don;t do extreme shifts like the one that may have caused this one either.

even if i caused it, it took 20 more riding miles to exhibit any evidence.. what kind of sense does
that make?

wle.

(wle) may have said:

Quoted message said:

Check the freedom of motion of the der pivots with the bike at outdoor riding temp. If any are
binding or sticking (which could easily be precipitated by cold weather) then you've found
your cause.

no, it had been colder in the morning.

no recent work on the bike.

what i am asking is, is there any shift-related event that can bend the derailleur hanger?

No normal shifter motion will bend the hanger.

Quoted message said:

i mean, the worst you could do would be to go crank on a shifter without pedaling, or pedaling
slowly, the chain could get at a weird angle, with that plus a lot of pedal pressure, would that
lone bend the hanger?

No.

Quoted message said:

i have read that, nothing bends them but a crash, yet i have had mine bent at least 3 times, no
crashes. normally i don;t do extreme shifts like the one that may have caused this one either.

I've had two bends due to non-crash incidents. One was the sticking pivot problem that I described
earlier, the other was due to a der failure which also put the jockey wheels into the spokes.

Quoted message said:

even if i caused it, it took 20 more riding miles to exhibit any evidence.. what kind of sense does
that make?

It sounds just like what happened when I had the sticking pivot.

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outa whack? the hanger canbe adjusted with or by a 6" plus grip channel locks or pipe wrench.
buyastringandgetthe hang ofyeballingthe
chain/gears/cluster/frameitsavisualproblemthatsneedsadjsutingtoo. the rig, and i ride
friction levers, goes outawhack slowly over 200 miles or so then doesn't work so good then
doesn't work at all.

Werehatrack <[email hidden]> wrote in message news:<[email hidden]>...

Quoted message said:

(wle) may have said:

Quoted message said:

Check the freedom of motion of the der pivots with the bike at outdoor riding temp. If any are
binding or sticking (which could easily be precipitated by cold weather) then you've found your
cause.

no, it had been colder in the morning.

no recent work on the bike.

what i am asking is, is there any shift-related event that can bend the derailleur hanger?

No normal shifter motion will bend the hanger.

Quoted message said:

i mean, the worst you could do would be to go crank on a shifter without pedaling, or pedaling
slowly, the chain could get at a weird angle, with that plus a lot of pedal pressure, would that
lone bend the hanger?

No.

Quoted message said:

i have read that, nothing bends them but a crash, yet i have had mine bent at least 3 times, no
crashes. normally i don;t do extreme shifts like the one that may have caused this one either.

I've had two bends due to non-crash incidents. One was the sticking pivot problem that I described
earlier, the other was due to a der failure which also put the jockey wheels into the spokes.

Quoted message said:

Quoted message said:

even if i caused it, it took 20 more riding miles to exhibit any evidence.. what kind of sense
does that make?

It sounds just like what happened when I had the sticking pivot.

but - what is the difference between sticky pivots, and
trying to jam the chain over when it doesn;t want to go?

either way, the result is a lot of unresolved force from the cable side.

are you saying this force bent your hanger?

wle.

wle said:

Werehatrack <[email hidden]> wrote in message
news:<[email hidden]>...

Quoted message said:

(wle) may have said:

> Check the freedom of motion of the der pivots with the bike at outdoor riding temp. If any are
> binding or sticking (which could easily be precipitated by cold weather) then you've found your
> cause.

no, it had been colder in the morning.

no recent work on the bike.

what i am asking is, is there any shift-related event that can bend the derailleur hanger?

No normal shifter motion will bend the hanger.

Quoted message said:

i mean, the worst you could do would be to go crank on a shifter without pedaling, or pedaling
slowly, the chain could get at a weird angle, with that plus a lot of pedal pressure, would that
lone bend the hanger?

No.

Quoted message said:

i have read that, nothing bends them but a crash, yet i have had mine bent at least 3 times, no
crashes. normally i don;t do extreme shifts like the one that may have caused this one either.

I've had two bends due to non-crash incidents. One was the sticking pivot problem that I
described earlier, the other was due to a der failure which also put the jockey wheels into the
spokes.

Quoted message said:

Quoted message said:

even if i caused it, it took 20 more riding miles to exhibit any evidence.. what kind of sense
does that make?

It sounds just like what happened when I had the sticking pivot.

but - what is the difference between sticky pivots, and
trying to jam the chain over when it doesn;t want to go?

either way, the result is a lot of unresolved force from the cable side.

are you saying this force bent your hanger?

wle.

I bent mine once leaning the bike up against a fence a little carelessly. Maybe somebody bumped into
the bike while I was having my coffee.
--
Perre

You have to be smarter than a robot to reply.

wle said:

what i am asking is, is there any shift-related event that can bend the derailleur hanger?

Yeah, if you shift while crushing on the pedals, it can cause drivetrain problems - bent chain
links, bent derailleur, bent der hanger.

In the "old days" [tm], you always had to lighten up on the pedals just a bit while shifting. With
new drivetrain parts and shaped rings and cogs that allow easier chain derailment, a lighter touch
is not necessary to shift, but it is still a good idea.

Once the der hanger is bent, it is probably easier for it to get bent again (depending on material).

(wle) may have said:

but - what is the difference between sticky pivots, and
trying to jam the chain over when it doesn;t want to go?

A properly adjusted derailleur will not leave its normal operational position ranges just because
you pull on the cable with the chain stopped. But when a pivot sticks while you're shifting *with*
pedalling, the jockey wheels *may* get into areas where they should not be, and *may* grab the
spokes. The cable isn't the culprit, the out-of-bounds motion of the der is. When you try to force
the der while stopped, almost no motion will occur, therefore not out-of-bounds motion will, either.

Quoted message said:

either way, the result is a lot of unresolved force from the cable side.

Which the der is quite capable of ignoring.

Quoted message said:

are you saying this force bent your hanger?

No, the bloody huge wrenching of the whole mess around with the wheel when the end of the der
grabbed a spoke is what bent it. No force that the *cable* can exert will bend the hanger. But if
things aren't ring in the ser, in shifting. the der can get tangled with the spokes, and *that* will
bend the hanger. It can't happen unless the wheel and chain are in motion to swing the der into the
path of a moving spoke. Not all rear ders will allow a der/spoke collision, but many will, and aside
from an impact, that's the only way I've seen for a bent hanger to result.

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