Bike falling!

when bike falls to a side: it hits rear changer pedals and steerer..

Is this harmful to rear changer? and how is rear changer durable or
resistant to such hits?

There is a metal piece that rear changer is mounted on: whats its purpose

In article , "606"
wrote:

when bike falls to a side: it hits rear changer pedals and steerer..

Is this harmful to rear changer? and how is rear changer durable or
resistant to such hits?

There is a metal piece that rear changer is mounted on: whats its purpose

The rear changer doesn't tend to get bent or broken in such falls, but
the mount can be bent. If that happens, your shifting may get all messed
up until you fix it.

The derailer hanger is a bolt-on piece because there are a few failure
modes for drivetrains where the derailer can get huge amounts of force
put through it. The usual failure mode is for the derailer to get torn
off the frame.

By making the derailer mount a replaceable part, the entire frame
doesn't need to be replaced when the derailer gets ripped off.

--
Ryan Cousineau http://www.wiredcola.com/
"I don't want kids who are thinking about going into mathematics
to think that they have to take drugs to succeed." -Paul Erdos

On Sun, 14 May 2006 20:22:52 +0200, "606"
wrote:

when bike falls to a side: it hits rear changer pedals and steerer..

Yes, gravity tends to have that result.

Is this harmful to rear changer?

It can be.

and how is rear changer durable or
resistant to such hits?

Not very.

There is a metal piece that rear changer is mounted on: whats its purpose

There are two possible answers to this, depending upon the type of
derailleur and frame you have. If the derailleur is mounted to the
frame via a formed insert that comprises part of the dropout (that's
the flat frame section which has the axle slot in it), and the bracket
under discussion is aluminum, then its purpose is to be a replaceable
part that can be swapped out when it's damaged, so as to avoid having
to replace the frame or perform a much more difficult repair instead.
If the bracket is a stamped steel tab that is trapped under the axle
nut (this type is not used with a quick-release), it's part of the
derailleur assembly and is not sold separately. The latter type of
setup is used almost exclusively on cheap bikes.

Some mountain bike makers have, at times, equipped their units with a
derailleur guard to try to protect that part from such mishaps, but
they are seldom seen now. Their presence didn't accomplish very much.

The best idea is to avoid dropping your bike on the right side.
--
Typoes are a feature, not a bug.
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The best idea is to avoid dropping your bike on the right side.
--

The wind make it fall.. suddenly..

But I do not notice any harm to rear changer and this metal piece is not
bent..

A question about this changeable metal piece: is this metal easy to bend or
it is more like fragile ?

On Sun, 14 May 2006 23:39:32 +0200, "606"
wrote:


The best idea is to avoid dropping your bike on the right side.
--

The wind make it fall.. suddenly..

But I do not notice any harm to rear changer and this metal piece is not
bent..

A question about this changeable metal piece: is this metal easy to bend or
it is more like fragile ?

It is neither easy to bend nor particularly fragile, but it's the part
that will get bent if something gets jammed in the chain while riding.
When that happens, the der hanger bracket will get badly bent. If it
wasn't replaceable, the bike frame would require expensive repairs or
complete replacement.
--
Typoes are a feature, not a bug.
Some gardening required to reply via email.
Words processed in a facility that contains nuts.

It is neither easy to bend nor particularly fragile, but it's the part
that will get bent if something gets jammed in the chain while riding.
When that happens, the der hanger bracket will get badly bent. If it
wasn't replaceable, the bike frame would require expensive repairs or
complete replacement.

but the metal "slide" on the frame has THE SAME thickness like this metal
replateable part : then the frame part could be bent not only this
replaceable part

On Mon, 15 May 2006 19:05:18 +0200, "606"
wrote:

It is neither easy to bend nor particularly fragile, but it's the part
that will get bent if something gets jammed in the chain while riding.
When that happens, the der hanger bracket will get badly bent. If it
wasn't replaceable, the bike frame would require expensive repairs or
complete replacement.

but the metal "slide" on the frame has THE SAME thickness like this metal
replateable part : then the frame part could be bent not only this
replaceable part

Post a picture. I don't think you've got the type of frame I'm
talking about.
--
Typoes are a feature, not a bug.
Some gardening required to reply via email.
Words processed in a facility that contains nuts.

The wind make it fall.. suddenly..

But I do not notice any harm to rear changer and this metal piece is not
bent..


Welcome to our poster from Croatia!

I can tell you that my bike and I fell on the right side once and the
derailleur hanger bent as it hit the ground. You can tell instantly if the
parts are out of alignment (or bent) because the bicycle makes a lot of
noise when you try to pedal it and the derailleur will not shift properly to
another gear. It will sound terrible and you WILL notice that!

Since you were not on the bicycle when it fell, it probably is not damaged.
Mine got damaged on the soft ground, though, so anything is possible. But,
if you don't notice any harm, there probably is not any damage.

Pat in TX

Welcome to our poster from Croatia!


thanks

bike is all right