Ride-A-Lot said:Phil said:Ride-A-Lot said:JohnH wrote:
>> Oh well, looks like a trip to the shop soon.
>
>
> What caused the damage? We have "Derailurer Hanger Eater Sticks"
> on the trails often around here, especially after windstorms. These
> [censored] jump up and can bust up a drivetrain with
> surprising ease. Another common cause for this is to have it in 1st
> gear and hit a
> drop - the chain will fall into the spokes and snap the hanger
> right off. At least this cause is preventable 😉
>
> The solution for me has been to carry a spare hanger. The
> Derailurer Hanger Eater Sticks can sense them and therefore avoid
> me now 😉 Despite pretty severe bending, it's unusual for me to
> see a derailurer which can't be bent back into useable shape.
>
No sticks at all. The trail is all 3" - 4" round babyheads firmly
planted in the ground. Pretty much the whole trail is like this:
http://www.schnauzers.ws/public/images_upload/IMG_2269.jpg
They did not pop up and hit it. I was in the middle ring and about
the middle on the rear going up a rather steep uphill section. Again
it's pretty technical so I popped out of the saddle to get a
bit more torque from my legs and pop! That was it.
I just bought a Surly singulator which I plan to carry in my 'bak
now so that I can turn the FS into an SS to get me out of the woods.
I hate to be the retro-grouch here... I'm not even old enough to be
one. But the first mistake was the FS. Shifting isn't as static on
them. On a serious note, the standing up on the pedals caused the whole
thing to happen. Are you sure the derailleur broke off the hangar? How
are you sure? Which part actually broke off? FS's typically
suffer from poor shifting when the housing is too short or is put in
a position where it has lots of dynamic movement, causing ghost
shifting.
Take a look at the pics in the original post. It split at the bolt.
My apologies! I totally clicked the first link and forgot about the other
two.
Quoted message said:The bike was already in gear when I hit the climb. There was no skip,
I wasn't saying that you were shifting... I was saying that pedaling out the
saddle could have caused a ghost shift, but as you say, there was none.
After having looked at the pictures, it looks like a brittle fracture of the
metal. I'll submit these to rec.bicycles.tech and see what they say. I'm
as puzzled as you are.
Quoted message said:rub, or ghost shift. It was in gear and running smooth. It had been
running smooth for the first 16 miles on the same terrain.
Quoted message said:
Without knowing any more details, my first impression is that the
limit screws weren't set correctly, causing the chain to grind
behind the cassette. But I wasn't there... please enlighten me.
I would have noticed that or there would have been some chain suck
prior. None of that happened. One of the guys in the club is 6'3 230
pounds and all muscle. He used to break Shimanos all the time at the
bolt before using breakaway bolts. He's the type who just muscles his
way through stuff. I'm not that strong (or maybe I just under
estimate myself).
He's having another problem, because no matter how strong or heavy a rider
is, a derailleur isn't under stress from the chain. The cassette takes the
full load of the rider's weight and power, and the derailleur only guides
the chain on near-frictionless pulleys, so no amount of rider torque could
directly cause a derailleur failure.
Sorry about assuming things as I did.
--
Phil, Squid-in-Training