Mounting system for rear derailleur

[vickster]

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
So find one that looks like the first if that’s the one that’s on the bike.
they aren’t interchangeable as said

 

[Punkawallah]

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.

 

[Biker2772]

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.

I'm not sure which length cage I need

 

[classic33]

I'm not sure which length cage I need

What's in place at present.

 

[Biker2772]

What's in place at present.

I need a short cage

 

[classic33]

I need a short cage

Why were you thinking of fitting a medium.

The 2nd rear derailleur that I have has a medium length arm so I'm sure any medium length rear derailleur will fit. The bigger question is if it's possible to make it compatible.

 

[raleighnut]

I need a short cage

Even a 'long cage' will be fine, you don't need to use its full capacity.

 

[Biker2772]

Does it matter the length matter?

 

[raleighnut]

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.

 

[Biker2772]

I'm thinking which shimano rear derailleur will work with my bike.

 

[raleighnut]

I'm thinking which shimano rear derailleur will work with my bike.

Any of them as long as it is the right 'speed' (number of cogs) google 'pull ratio'

 

[Dogtrousers]

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.

 

[Punkawallah]

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.

 

[Biker2772]

My bike is 6×3 speed

 

[Punkawallah]

Should still work.