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 Post subject: Slipping Gears
PostPosted: Sat Oct 19, 2013 11:20 pm 
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Location: Liverpool, UK.
Hi folks, I have a 2012 Trek 6000 MTB that has done approx 500 miles, most of it in bad weather. The gears shift perfectly on the LBS bike stand. It has been serviced and looked after. The problem I have is when I am out riding and put some power down it slips badly. Shifts perfectly on bike stand/slips badly when giving it some. After 500 miles, surely the cassette/chain rings/chain would not need replacing? Or am I wrong?

Any advice much appreciated.

Thanks

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 Post subject: Re: Slipping Gears
PostPosted: Sun Oct 20, 2013 12:03 pm 
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Posts: 250
Location: Hampshire, UK
I take it the slippage happens at the back? Quite often this is down to the cassette so check the sprockets that the slippage occurs in for wear/damage. If possible borrow another wheel and test on your bike, if the slippage still occurs check your chain to see if its stretched, alignment of the derailleur and that the hanger isn't bent. Also check your jockey wheels for excessive wear.

After 500mi and in most cases the drivetrain shouldn't need replacing no, one of the parts could just be a dud.


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 Post subject: Re: Slipping Gears
Posted: Sun Oct 20, 2013 12:03 pm 


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 Post subject: Re: Slipping Gears
PostPosted: Sun Oct 20, 2013 1:54 pm 
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Location: Liverpool, UK.
miceden wrote:
I take it the slippage happens at the back? Quite often this is down to the cassette so check the sprockets that the slippage occurs in for wear/damage. If possible borrow another wheel and test on your bike, if the slippage still occurs check your chain to see if its stretched, alignment of the derailleur and that the hanger isn't bent. Also check your jockey wheels for excessive wear.

After 500mi and in most cases the drivetrain shouldn't need replacing no, one of the parts could just be a dud.


Sorry, yes, slippage always occurs at the back on the cassette. I was thinking about buying a new cassette and seeing if that solves the problem. Don't know wether to buy identical cassette or a better version of the same 11/36 set up.

No chance of me borrowing a wheel as my buddies are roadies.

So if I replace the cassette and it's still slipping should I replace the chain next? Alignment and derailleur should be ok as the LBS gave it a good service and said it shifted perfect - on the stand.

I'm not confident in the mechanic though. He told me 100% that a certain front chain set would not be compatible with my road bike. I took it to Evans and they fitted it and it shifts flawlessly.

Just wondering whether to see if the Evans mechanic can identify the problem before I start spending money replacing parts.

Thanks for the response.

Paul

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 Post subject: Re: Slipping Gears
PostPosted: Sun Oct 20, 2013 2:57 pm 
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If you're going to get a cassette to solve the issue, I would also get a new chain.


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 Post subject: Re: Slipping Gears
PostPosted: Sun Oct 20, 2013 3:46 pm 
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Location: Liverpool, UK.
rijndael wrote:
If you're going to get a cassette to solve the issue, I would also get a new chain.


Good idea. I will replace cassette and chain and hope that solves the issues.

Thanks

Paul

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 Post subject: Re: Slipping Gears
PostPosted: Mon Oct 21, 2013 12:10 am 
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Location: Fort St John
Doesn't sound like worn out components, more like things are not adjusted/set up correctly. Get a new mechanic or learn how to do the work yourself. It could be many things like derailleur hanger alignment, cable tension, gunked up cable housing, B-tension, chain length......

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 Post subject: Re: Slipping Gears
PostPosted: Mon Oct 21, 2013 2:08 am 
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Location: Southern Indiana USA
What Benno said!

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 Post subject: Re: Slipping Gears
PostPosted: Mon Oct 21, 2013 2:40 am 
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Shifting under power and on a bike stand are two completely different things. Since it's new and I doubt anything is worn out I would say the rear shifter cable as stretched (which is normal for a new cable) and the derailleur is out of alignment.

You should be able to look at it from directly being on 5th or 6th gear and the chain should look straight, adjust the tension knob as needed to make it straight, and then make minor changes based on how it shifts. If it all appears straight then check your derailleur for any bends. Then I would think about new cassette and chain. If you are ordering through a bike shop maybe take it to a different one like evans and get a second opinion first.


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 Post subject: Re: Slipping Gears
PostPosted: Mon Oct 21, 2013 1:47 pm 
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Location: Fort St John
Whatever you do don't go randomly replacing potentially good components for no reason at all. I've heard the same thing over and over about shops just throwing parts at a problem and not fixing a simple issue. I can't tell you how many times I've blown customers minds by taking 10min to properly set up the shifting on a bike. Usually they are completely frustrated, saying they just dropped up to $1500 on a new drivetrain and the bike still didn't work. Surprises them even more when I hand them a $10 invoice for a simple derailleur adjustment.

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 Post subject: Re: Slipping Gears
PostPosted: Mon Oct 21, 2013 2:47 pm 
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Posts: 689
Check your chain, I recently had a similar problem where it appeared to be fine on the stand, but slipped on every gear when I was actually riding. Turned out to be a broken link in the chain, it just had yet to completely fall apart.

EDIT: It looked like this, only it hadn't separated. Go through and double check every link just to make sure. This was the second time this has happened to me, and both times it took me a few looks to realize there was a broken link.
http://forums.bicycletutor.com/attachment.php?aid=361


Last edited by Colin on Thu Oct 24, 2013 3:22 am, edited 1 time in total.

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 Post subject: Re: Slipping Gears
PostPosted: Mon Oct 21, 2013 6:35 pm 
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Location: Liverpool, UK.
Benno wrote:
Whatever you do don't go randomly replacing potentially good components for no reason at all. I've heard the same thing over and over about shops just throwing parts at a problem and not fixing a simple issue. I can't tell you how many times I've blown customers minds by taking 10min to properly set up the shifting on a bike. Usually they are completely frustrated, saying they just dropped up to $1500 on a new drivetrain and the bike still didn't work. Surprises them even more when I hand them a $10 invoice for a simple derailleur adjustment.


Great advice! Can you fix it for me?? [WHITE SMILING FACE]️ I'm in Liverpool UK area. Failing that, I will hope the Evans mechanic can fix it. Thanks for the help.

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 Post subject: Re: Slipping Gears
PostPosted: Tue Oct 22, 2013 7:18 pm 
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Location: Fort St John
Would love to man but I live in Peterborough Canada lol so not really practical. Good luck though.
I have a few different maintenance articles that might be of some help if you ever feel like getting your hands dirty.

Here are a few related to rear shifting....
http://bennosblogandmore.blogspot.ca/20 ... lleur.html

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Last edited by Benno on Tue Oct 22, 2013 7:28 pm, edited 1 time in total.

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 Post subject: Re: Slipping Gears
PostPosted: Tue Oct 22, 2013 7:26 pm 
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Joined: Thu May 30, 2013 6:59 pm
Posts: 65
Location: Liverpool, UK.
Benno wrote:
Would love to man but I live in Peterborough Canada lol so not really practical. Good luck though.
I have a few different maintenance articles that might be of some help if you ever feel like getting your hands dirty.

Here are a few related to rear shifting....
http://bennosblogandmore.blogspot.ca/20 ... lleur.html" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;


LOL worth a try!! Thanks for the link, I will give it a go. It's not that I think I'd be incapable if fixing it, just worried I'd make it worse! If I do I'll take it to Evans : )

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 Post subject: Re: Slipping Gears
PostPosted: Wed Oct 23, 2013 4:42 pm 
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Joined: Thu May 30, 2013 6:59 pm
Posts: 65
Location: Liverpool, UK.
I have tried the high/low adjustments screws on the rear derailleur and the problem still persists! This is so annoying because the bike is perfect apart from this regular problem.

Here are some pictures for the more experienced of you to see if you think any components have worn and are causing the slippage.

Thanks

Image
IMG_5682 by p.t.mainwaring, on FlickrImage
IMG_5681 by p.t.mainwaring, on FlickrImage
IMG_5680 by p.t.mainwaring, on FlickrImage
IMG_5679 by p.t.mainwaring, on FlickrImage
IMG_5677 by p.t.mainwaring, on Flickr

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 Post subject: Re: Slipping Gears
PostPosted: Wed Oct 23, 2013 5:31 pm 
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Joined: Thu May 30, 2013 6:59 pm
Posts: 65
Location: Liverpool, UK.
I have just thoroughly cleaned the whole drive train using white lightening degreaser. I studied the photos I uploaded and realised it was extremely dirty/full of gunk/old lube. Is it possible that this might have been the problem? I won't get to ride it until tomorrow now. Failing that its a trip to Evans to see if the mechanic can solve the problem.

Cheers

:(

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 Post subject: Re: Slipping Gears
Posted: Wed Oct 23, 2013 5:31 pm 


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