Rear Mech Disaster

aldric

I was out with my kids earlier today going very slowly, suddenly heard a clunking sound and the pedals seized bringing me to a sudden stop. I just about managed to get out of the pedals before a crash and looked back and saw the rear mech near enough lying on the floor

http://www.youtube.com/watch?v=D400dNJh8UM

I am not very good at bike maintenance, however was wondering if this is something I can fix myself? I assume the whole lot will need replaced? I initially thought the frame was badly damaged as well, but I think only a small piece of paint came off.

The chain will also need replacing.

Any thoughts on the cost of getting a lbs to fix this or for me to do it myself?

Thanks.

ThatBikeGuy

Mech hangers are very easy to replace and cheap to source. Chain and mech look okay from the video although could do with a clean.

Quick vid from youtube here:http://www.youtube.com/watch?v=vYPozPILVHM

aldric

That sounds great, I thought it was going to be an expensive fix. I am a bit clueless about this, is there a certain type of mech hanger to buy?

The chain is completely goosed I am afraid:



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There seems to be a bit of corrosion on the rear hanger, is that the right terminology? The bike is 2 years old and was used heavily in the winter in the first year for commuting to work. Hardly been on it in the last year though.

ThatBikeGuy

What bike do you have? Different hangers for different frame brands.
New rear mech might set you back 30 quid tops, although a bit of salt corrosion might not be so much of an issue, try cleaning it and see how it comes out.

aldric

It is a Focus Mares Comp 2010-2011.. its a Tri-Cross.

It could do with a good clean thats for sure :P

ThatBikeGuy

Might be worth emailing wiggle to see if they have any for your specific bike or if they can order one in. If not then email focus directly and they should be able to tell you which hanger it is and may be able to send you one out directly.
http://www.wiggle.co.uk/focus-mech-hanger/

aldric

Thanks for your help.

It appears that wiggle don't stock them for my bike - seems pretty typical.

I might just take the bike to a lbs for a quote and take it from there, not being very technically minded it might save me some money as I will probably break the new parts!

aldric

Removed the snapped piece of metal from the bike and I think I have found the right rear mech hanger from ebay, waiting for an email to confirm *fingers crossed*

I have untangled the chain and it definitely needs replacing. Any suggestions for a chain for 9 speed Tiagra?

I am hoping the rear de-railer, doesn't need replaced however it might be slightly bent, hard to tell. It is badly corroded as well, but I doubt that really makes a difference other than the cosmetic appearance?

aldric

Is this chain OK?

http://www.wiggle.co.uk/shimano-hg93-9-speed-chain/

Apologies for all the questions, bike repairs / maintenance isn't one of my strongest points

davidgunthorpe

that chain would be fine

try it with your rear mech, you'll soon know if the mech is bent if the gears won't index properly

Dirty-Boy

You might also need a new cassette if replacing the chain depending on how worn the current cassette is. I would advise taking it to your lbs with the bits you've purchased.