Campag rear derailleur bolt

DeVlaeminck

OK am I missing something ?

I have a campag chorus 11 speed rear mech that has snapped off the frame with half the mech hanger (non crash related accident). The rear mech appears undamaged but I can't unscrew it from the remaining part of the mech hanger it is screwed in to. I'm using a Torx bit and doing it anti clockwise like a normal nut - I've tried with a 30mm Torx on the back and I think a 25mm on the front seems to fit but neither budge it.

I don't remember mechs being attached this tight - I can't remember having a problem removing one before - maybe I can't get much leverage because it's only attached to a small bit of mech hanger not a bike but even so it seems harder than it should. Can anyone think of something obvious I'm missing or come up with a solution - I only have a folding torx bit set and don't have a vice so putting a huge amount of force into it is going to be difficult but I don't want to risk damage to the mech anyway if there's something simple I'm doing wrong.

gattonero

Unfortunately that does not really exist as a spare part.
The bolt has a "5 star" shape. It can be removed (it is broken anyway) with a "3 star" insert from the outer side, plus a Torx30 from the inside.
Or careful drilling.

Good news are, you can use a pivot bolt from previous 9/10sp Campagnolo mech's, and secure it with the clip.
this doesn't work with 2015 shifters, which are very different from the rest

mikenetic

I've worked on bikes where the Campag mech has been very hard to remove. If you have two long-handled Torx keys you can put one in each side of the bolt to provide more force. In your case you may have to clamp the bit of mech hanger in a vice to hold it steady

Guernsey Donkey

Campag Chorus is T25 Torx but Chorus EPS is hex (5mm I think).

gattonero

If the pivot bolt is black, then is alluminium and does use a T25 outside and a T30 inside.
Before cranking it out, I'd rather remove the whole hanger from those silly-light frames where it all can snap!

lapavoni10

Just a sanity check.....when you attack the bolt from the back you ARE turning it clockwise(so when you look at the front it's turning anti-clockwise)?,

gattonero

[url=http://www.bikeradar.com/forums/viewtopic.php?p=19676910#p19676910]lapavoni10[/url] wrote:

Just a sanity check.....when you attack the bolt from the back you ARE turning it clockwise(so when you look at the front it's turning anti-clockwise)?,

Uh, god no, never seen a derailleur that screws in left-hand. I always screw them in clockwise, like any other standard bolt; and not very tight (the manufacturer says 10Nm, I do more or less half of that value)