Mounting system for rear derailleur

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vickster

Legendary Member
Yes, but I wanted a new rear derailleur that has a mounting system like the first rear derailleur that I posted.
Right, you didn’t actually say which of the two you need :wacko:
So find one that looks like the first if that’s the one that’s on the bike.
they aren’t interchangeable as said
 
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Punkawallah

Über Member
So, your bike has a built-in derailleur mount, and you need one that will fit? Long cage or short? I can probably put my hand on one next week.
 

raleighnut

Legendary Member
Does it matter the length matter?
No, unless it is too short for the gearing fitted, all the cage length does is take up the 'slack' in the chain.
 

Dogtrousers

Kilometre nibbler
Does it matter the length matter?
Work this out : (number of teeth on biggest sprocket + number of teeth in biggest chainring) minus ( no of teeth on smallest sprocket + no of teeth on smallest chainring)

This is the required capacity of the mech. Now look up in the tech docs what is the capacity of the various mechs that you're looking at.

The capacity is a measure of the difference between the two extremes that the mech can cope with and reflects its ability to take up slack. Longer cage gives greater capacity.
 
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Punkawallah

Über Member
You can have this one for shipping cost. Obviously needs cleaning up, but worked on the bike it was taken from. IIRC a 7 x 3 MTB.
 

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