Can't find any 7 speed rear derailluers?

[Matthew_T]

7 and 8 speed mechs are indistiguishable. 9 uses a narrower chain and therefore narrower jockey wheels. Fit 7/8 speed jockeys to a nine speed mech to make an 7/8 speed mech.

The important thing is 'capacity'. Which is two numbers and refers to (a) the size of the largest rear sprocket (which determines the angle of travel of the parallelogram and therefore how closely it sits to the sprockets) and (b) the tooth difference of the whole system - ie (52 minus 39) plus (32 minus 11) equals total tooth difference, which determines the length of the cage plate and the mech's ability to take up slack in the chain during gear changes.

Didnt understand a word of that. I am not the most bike literate of people, and enjoy riding, not fixing. I could probably refit a whole mech at the back as you only need to take the chain off and unscrew it.

 

[chillyuk]

Didnt understand a word of that. I am not the most bike literate of people, and enjoy riding, not fixing. I could probably refit a whole mech at the back as you only need to take the chain off and unscrew it.

It is not difficult to replace the mech without removing the chain as long as you have removeable jockey wheels. I bought a cheapo rear mech and it had riveted jockey wheels. It never got as far as the bike and is still in my bits box in the shed.

 

[mickle]

Didnt understand a word of that. I am not the most bike literate of people, and enjoy riding, not fixing. I could probably refit a whole mech at the back as you only need to take the chain off and unscrew it.

Just keep reading it over and over. Eventually it'll sink in, I'm sure.

 

[Matthew_T]

 

[Moodyman]

As GTi said, it's a bent hanger.

 

[Matthew_T]

As GTi said, it's a bent hanger.

So where can you get one of those?

 

[Globalti]

Er.... how about a bike shop?

Just unbolt the derailleur from the hanger, allow it to hang on the chain then unbolt the hanger from the frame, pop it into your pocket and jump on the bus to town. With yours you will also need to unbolt the rear wheel.

Don't bother trying to straighten it; you will never get it perfect without the gauge and the alloy will work harden then snap next time you're out on the bike. While at the shop consider buying a spare hanger too.

 

[mickle]

Or you could try straightening it....

 

[funnymummy]

Thnak: The sound of a hand hitting back of a head.

Nope, that makes more of a "Thwat" sound
Thnak is like Thank, but nicer