Calling any bike mechanics?

Cycling, trains, walking. This is the place to talk about how good or bad cycle routes are, mention great train journeys, talk about car sharing schemes or husky travel. Anything in fact that is about transport that is a little alternative.
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Graye
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Calling any bike mechanics?

Post: #130449 Graye
Wed Nov 05, 2008 5:19 pm

OH went out on my mountain bike a month or so ago and it came back with the back derailleur completely mangled, the chain twisted and the back end generally jammed solid. I'm not sure what he did but the bike had been in the back of the car the day before so presumably something became misaligned and it just went from there.

Having spent years taking my son bike racing (albeit on a fixed wheel bike) I decided I would have a go at fixing it. I've had the chain off, straightened the twisted links and fitted a brand new derailleur. It's now all reassembled and seems to work OK on the front chain rings (there are three) but the rear ones (six) only seem to work on the middle four sprockets. Before I leap in and start adjusting all sorts of things can anyone tell me which is the most likely reason for this please?
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Re: Calling any bike mechanics?

Post: #130522 jim
Thu Nov 06, 2008 9:11 am

Dear Graye,
On the deraulier spring loaded arm, between the 2 small gears, you should find 2 small screws pointing towards, or in contact with, a small plate of metal. Turn the one in contact with the metal plate a quarter turn at a time either clockwise or anticlockwise, then spin the wheel by means of the pedals whilst changing gear up and down. Repeat until you get a result. Then try with the other screw. DON'T move either more than a quarter turn at a time or you run the risk of throwing the chain off the block.

Hope it's been useful, good luck with it.
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Graye
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Re: Calling any bike mechanics?

Post: #130742 Graye
Fri Nov 07, 2008 12:45 pm

Thanks for that! I thought it might involve some delivate adjusting somewhere. I'm getting there - I've got FIVE rear gears now so just a bit more adjusting and I may get it right later today. I'm struggling as I'm having to adjust the screws AND hold the rear wheel off the ground AND turn the pedals all at once. Things will be easier when I have someone to help later.
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Re: Calling any bike mechanics?

Post: #130749 Brod
Fri Nov 07, 2008 1:11 pm

Re fiddling with derauliers and such I usually turn the bike upside down and turn the pedal with hand and twiddle with the other.
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Graye
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Re: Calling any bike mechanics?

Post: #130773 Graye
Fri Nov 07, 2008 4:25 pm

Now that's far more sensible! I'll give that a try later. My own fault because I always used to have a bike stand to do all the adjustments on my son's BMX and hadn't really thought through how to manage without one.

Hopefully we'll be back on the road tomorrow. Thanks for the assistance!
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Re: Calling any bike mechanics?

Post: #133239 mamos
Wed Dec 03, 2008 1:24 pm

Hi

In addition to the info already posted I would like to point you in the direction of Sheldon Brown a god to most cyclists who sadly died this year but his gold mine of a website survives.

http://sheldonbrown.com/derailer-adjustment.html

Everything you ever need to know about bike and a lot you will never need to know

mamos
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Graye
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Re: Calling any bike mechanics?

Post: #134264 Graye
Sun Dec 14, 2008 5:38 pm

That's a useful link, thanks.

I've managed to adjust mine properly now and it works well. I must admit I'm reasonably impressed with myself!
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mamos
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Re: Calling any bike mechanics?

Post: #134270 mamos
Sun Dec 14, 2008 8:19 pm

Well done Graye

I love learning new stuff

Think how much money you have save by not having to take your bike the the shop

mamos
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