--------------090208060808050402010104 Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
Marty Gulaian said:"A Muzi" <[email hidden]> wrote...
Quoted message said:I agree it sounds astronomically implausible that one rider would find several defective Shimano
cassette bodies in a series. But I can't postulate a scenario that would cause such a repeatable
failure either - they are pretty tough and dependable overall, especially within their price
range. He does accurately describe a pawl failure.
I used to break freehubs at the pawls pretty often (a few times a year) and still break one every
year or so. I think the mechanism is that you start with a partial engagement which slips and leads
to the pawls slamming into the next engagement point really hard and failing.
I ride a lot in the winter (thickens up the lube so the pawls don't engage as quickly or
completely) and do a lot of trials stuff (sudden pedal kicks when the hub isn't really engaged) and
I think that leads to my problems. I've gotten better at being smoother and making sure the hub is
engaged before pedalling and it helps some.
Trials guys love the Chris King hubs and a lot of them used the LX silent clutch (? do they still
make that) and both of them apparently stand up better than the Shimano hubs to this kind of thing.
- Marty G
I second that. I had a pawl failure and it was after I'd acquired a dumb habit of pedalling with one
leg, through a very smal arc. The jerky motion resulted in a repeated shock impact on the pawls
rather than a simple load carrying. I didn't think much about it until after the failure. Is there
something about the user's riding style on these trails that results in these kind of "pedal kicks"
and pawl impacts? He claims his brother has the same riding style but perhaps there is a difference
in the smoothness and acceleration of the pedals before the pawl engagement.
--------------090208060808050402010104 Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title></title>
</head> <body> <br> <br> Marty Gulaian wrote:<br> <blockquote type="cite"
cite="[email hidden]"> <pre wrap="">"A Muzi" <a
class="moz-txt-link-rfc2396E" href=""][email hidden]"><[email hidden]></a>
wrote... </pre> <blockquote type="cite"> <pre wrap="">I agree it sounds astronomically implausible
that one rider would find several defective Shimano cassette bodies in a series. But I can't
postulate a scenario that would cause such a repeatable failure either - they are pretty tough and
dependable overall, especially within their price range. He does accurately describe a pawl failure.
</pre> </blockquote> <pre wrap=""><!----> I used to break freehubs at the pawls pretty often (a few
times a year) and still break one every year or so. I think the mechanism is that you start with a
partial engagement which slips and leads to the pawls slamming into the next engagement point really
hard and failing.
I ride a lot in the winter (thickens up the lube so the pawls don't engage as quickly or completely)
and do a lot of trials stuff (sudden pedal kicks when the hub isn't really engaged) and I think that
leads to my problems. I've gotten better at being smoother and making sure the hub is engaged before
pedalling and it helps some.
Trials guys love the Chris King hubs and a lot of them used the LX silent clutch (? do they still
make that) and both of them apparently stand up better than the Shimano hubs to this kind of thing.
- Marty G </pre> </blockquote> I second that. I had a pawl failure and it was after I'd
acquired a dumb habit of pedalling with one leg, through a very smal arc. The jerky motion
resulted in a repeated shock impact on the pawls rather than a simple load carrying. I
didn't think much about it until after the failure. Is there something about the user's
riding style on these trails that results in these kind of "pedal kicks" and pawl impacts?
He claims his brother has the same riding style but perhaps there is a difference in the
smoothness and acceleration of the pedals before the pawl engagement.<br> </body> </html>
--------------090208060808050402010104--
