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Gears slipping
Topic Started: Sep 22 2013, 06:12 PM (436 Views)
andyjh
Mud Lover
First ride out my my bike since the LBS carried out a service and fitted a new chain and cables. Was expecting it to be adjusted to perfection, okay, may of set my hopes a bit high here. Anyway, before the bike went in all my gears selected perfectly apart from the front upper cog was a little tricky to get hooked up. Now when in the second gear at the back and either the lower or middle at the front, the gear keeps skipping or slipping. Really annoying as this is normally whilst climbing and you don't need this putting you off your stride!

I'm assuming this should just be down to adjustment but I don't understand why it's localised to just the second gear?
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Ashley1
Moaning Muddy Margaret
Could be your cassette is slightly worn and the introduction of a fresh chain to worn sprockets!!
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Coley
Fairly Muddied
What ashley said
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andyjh
Mud Lover
Interesting. Would explain why only one gear is slipping. Would you expect the wear to be obvious to the eye, hooked teeth etc? I ask as when I looked at it earlier it seemed fine to me.
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darth vader
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Mudking
As before new chain = new cassette unless you are really on the ball and change chain on a regular basis
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andyjh
Mud Lover
Fair enough. The guys in the shop advices me to change the chain at the first sign of wear in order to prolong the life of the cassette and front chainset so I'm going to buy a chain checker. They did say that my chain wasn't badly worn but I decided I might as well change it as it was a while back when I changed it last. Having said that the bike hasn't been used in a long time so it's not as bad as it sounds. However, I have no idea when the cassette was last changed so this might not be a bad idea. I had them check the condition of the chainset as I thought the high gear cog was worn but they advised against changing it at this point as it has plenty of life left.

More work to be done :D
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Bunnyflop
Mudking
previous experience with our bikes has always been if you replace your chain, replace the cog.

We usually buy new gears, chain, etc., at the beginning of summer and then ride this all year, replacing both again the next summer.

Even with a chain checker - and we've done this - it's very difficult to catch chain wear in time. Also, a worn chain works perfectly well with a cassette worn out at the during the same time. And the chain will only slip if the cogs have really huge wear.

This will also save you a load of aggro, time and money as chains are about £20/25 for a decent one. If you buy a SRAM S99 (i think that's the number) they are pretty bombproof and won't go rusty when on for a long time either.
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andyjh
Mud Lover
Right, seems like a new cassette is in order then. Hadn't really thought about it when the LBS suggested a new chain, wish I had now as it would be done and dusted. From what you say though it is certainly due a new one as this is the second chain I've put on and not one cassette.

Will have to stay like this for the up coming ride on Sunday and then change afterwards.

Dumb question but how easy/hard is a cassette change?
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Coley
Fairly Muddied
Its actually quite easy if you have the right tool as most cassettes can only fit on one way and then have a big nut type of thing that holds it on tight
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belugabob
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Mudking
Andy, if you buy a cassette from the shop at bedgebury, they'll probably install it for you.
Give them a call beforehand, to give them chance to get one. See if you can find the part number off your existing one.
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andyjh
Mud Lover
Now there's a good idea, like that. Thanks :D
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andyjh
Mud Lover
Doing a quick search it seems my bike has a basic Shimano HG50, 9-speed fitted as standard, assume that is what is on there now. These are cheap as chips but I might take the opportunity to upgrade to an XT M770 as the bike has XT and X0 parts everywhere else. Do you guys find these types of parts worth the money over standard parts?
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andyjh
Mud Lover
Had a look at the price of the XT cassette from Wiggle compared to local shops this morn. For the price I could buy locally I could get the same from Wiggle including the tools to fit for about the same money so I've decide to have a go at this myself :D I may live to regret saying this but, how hard can it be? :lol:
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Ashley1
Moaning Muddy Margaret
Sounds good to have a go yourself that's the way I learnt! Which saves me lots of money paying someone else to do it! I now spend it on other bike related items anyway!! If your having problems fitting it don't stress just bring it all along on Sunday and between us all I'm sure we can get it sorted before the ride!!
Margaret
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darth vader
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Mudking
It takes a bit of a heave to free it and it makes a horrible sound when it releases

just to warn you :D :D
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andyjh
Mud Lover
Thanks for that heads up on the noise :D and cheers for the offer of assistance on Sunday. Fingers crossed I can get it done but it's nice to know that if it goes wrong I can still make it to the ride :)
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robbo167
Bog Monster
Im another one who falls into Replace everything Together camp....its all the same age then..otherwise you end up with a mismatch of bits and pieces....in my working expeirence of events I see more trouble with new chains than almost anything else(wheels/tyres are the no1 source of trouble)...throw your chain checker away..if its all working well just leave it alone!!!
Of course if you went S/S you wouldnt have to worry...S/S drivetrains seem to last forever (nearly!)..

I am away a lot at the moment but happy to give you a hand /advice with your bike as I am in Storrington and have a fair few tools...PM me if I can help...
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andyjh
Mud Lover
Thanks for the offer Rob, you may well hear from me :D

So on the replace everything at once theme, do people also replace the cranks/front gears at the same time as the chain and cassette? This would start becoming an expensive job if so!
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darth vader
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Mudking
just cassette and chain

the front cogs seem to get away with it think because the rings are bigger and the have less ramps etc
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robbo167
Bog Monster
Just the rings Andy....granny unlikely to need replacement (unless its used a lot!!)...if you shop around its nowhere near as expensive as you think it is.
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