Gear slipping/crunching/making me look a fool

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Juddlinski
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Joined: Mon Jul 02, 2012 21:00 pm

Gear slipping/crunching/making me look a fool

Postby Juddlinski » Mon Sep 30, 2013 22:19 pm

Just got my bike back from a yearly service from those lovely people at Evans. Only thing is, some of the gears crunch/skip/jump when I put my foot down.

So no problems changing gears , it's just that when I'm on a certain few, and put some weight on, it skips/crunches. You know what I mean. I try and pull away at traffic light and %#Clank!&@ It jolts and I nearly fall off.

it is the lower front chain ring - the top half of the gears on there.

:oops: Apologies for being so clueless, but what should I do? Rear derailleur?

DesWeller
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Joined: Mon May 05, 2008 15:36 pm

Re: Gear slipping/crunching/making me look a fool

Postby DesWeller » Tue Oct 01, 2013 22:02 pm

So, if you've paid for a service and it worked before you took it in, you take it back and either demand your money back or make them fix it.

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supersonic
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Re: Gear slipping/crunching/making me look a fool

Postby supersonic » Tue Oct 01, 2013 22:03 pm

Did Evans fit any new bits?

bucklb
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Re: Gear slipping/crunching/making me look a fool

Postby bucklb » Wed Oct 02, 2013 12:08 pm

Sounds like they've replaced a worn chain, but not the cassette.

I replaced my chain at the weekend & got similar symptoms to yours - the chain basically slipping off the cassette teeth. Does the chain look shiney & new (and the cassette look less so)?

Juddlinski
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Joined: Mon Jul 02, 2012 21:00 pm

Re: Gear slipping/crunching/making me look a fool

Postby Juddlinski » Wed Oct 02, 2013 12:35 pm

bucklb - you're spot on. yes, they replaced the worn chain , but not the cassette.

I'll go back to Evans then. which will be a major ball-ache cos its not exactly local :twisted:

bucklb
Posts: 286
Joined: Sun Feb 08, 2004 13:18 pm

Re: Gear slipping/crunching/making me look a fool

Postby bucklb » Wed Oct 02, 2013 12:50 pm

Disappointing that they didn't take it round the block to road test it, as it's an obvious thing to check when swapping a chain.

Hope it goes well

Juddlinski
Posts: 46
Joined: Mon Jul 02, 2012 21:00 pm

Re: Gear slipping/crunching/making me look a fool

Postby Juddlinski » Wed Oct 02, 2013 18:40 pm

actually one last question.

The bike is a year old, so I'm pretty certain the cassette is in good nick...

So it the solution a new chain that fits?

I don't need to get a new cassette, do I?

bucklb
Posts: 286
Joined: Sun Feb 08, 2004 13:18 pm

Re: Gear slipping/crunching/making me look a fool

Postby bucklb » Wed Oct 02, 2013 21:22 pm

Bottom line is if the chain is worn then the cassette wil be starting to show some signs of weaar.

The wear will be a function of mileage rather than age. I get about 1,500 miles from a chain, which isn't brilliant, and a cassette lasts 2 or 3 chains (I really can't recall, but I suspect/hope it's 3). Replacing the chain extends the life of the cassette, and also your chain ring, so is well worth doing. You might want to invest in a chain wear tool that will allow you to see when your chain is starting to wear; they can be had for around £5.

If you've used the same chain & cassette for a significant mileage (say 4,000+ miles) then it's quite likely the cassette will be worn and need replacing. I'm covering about 7,000 miles a year and planning on 5 chains & 2 cassettes a year (I have an 8 speed setup and chains cost about £10, cassettes about £10 (sram pc870 & shimano hg41)). The chain is a doddle to swap, as it uses a powerlink. Cassettes aren't hard to change but do need a couple of tools - a chain whip and a cassette tool, but each should cost less than £10. If you plan to do a lot of miles a bit of DIY could saave you a packet

keef66
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Re: Gear slipping/crunching/making me look a fool

Postby keef66 » Thu Oct 03, 2013 15:50 pm

Bottom line is if they've fitted a new chain and it now skips, chances are the cassette's worn too. If you were doing it yourself, options at this point would be:

a) put the old chain back on and run both chain and cassette into the ground together

b) fit a new cassette and resolve to start checking chain wear more frequently.

I suspect a) is no longer an option as they will have binned the old chain, and anyway that approach would also start to wear the chainrings which might be dearer in the long run.

New cassette time I think.

Juddlinski
Posts: 46
Joined: Mon Jul 02, 2012 21:00 pm

Re: Gear slipping/crunching/making me look a fool

Postby Juddlinski » Thu Oct 03, 2013 16:40 pm

Bucklb, Keef - many thanks! Appreciate the advice.


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