Which Rear Derailleur for '92 Kona Hahanna

[Matt1976]

Hi all,

My rear derailleur or rear mech I think you call it has sheared completely off so need to buy a new one but not sure what type is required or how much it matters.

Bike is a 21 Speed Kona Hahanna entry level MTB from 1992 ish. I've attached a couple of pictures which might help. Any advice greatly appreciated,

[attachment=3176][attachment=3175]

cheers

Matt.

[barefooter]

Matt,
It looks like your derailleur hanger has been bent pretty badly also. Before you invest any money in a new derailleur, you might want to try to straighten it without breaking it off by using the method shown here:

http://www.utahmountainbiking.com/fix/rhanger.htm

Be patient, use the longest bolt of the right size you can find, and bend it back into alignment in small increments. Good Luck!

[Matt1976]

Cheers Dude,

Yeah I thought that as well, but wasn't sure if it was the design! Doh. Will give it a go then, I haven't got the money to waste at the moment!

[barefooter]

Matt,
You can find some inexpensive rear derailleurs on ebay if the straightening works out. Just make sure you get one that matches the shifter activation ratio. i.e. usually shimano = 2:1, sram 1:1. By the look of the shifter in your picture it is a shimano type.

[Matt1976]

Beautiful thanks,

There's a community bike project local to me that probably have the bolt for the straightening job.
I can't quite get my head round 2:1 is that the ratio between largest cog size to the smallest of the sprockets? Will see how I get on.

Cheers!

[barefooter]

The 2:1 ratio refers to the amount of cable pull for the correct shimano indexed shifting (SIS). Your picture shows shimano shifters so you will need a shimano or shimano compatible derailleur.

Your community bike project might have a hanger alignment tool (somewhat expensive), which works better and easier than a bolt. If they do someone there should be able to show you how to use it.

Salute!