Bicycle TutorBicycle Tutor

Show off your bike!

Post Reply 

Chain slips under foot pressure.

Related video tutorials:
Author Message
easteregg24 Offline
New Member


Posts: 9
Joined: Jul 2010
Post: #1
Chain slips under foot pressure.
Hi, All

I am having issues with one of my bikes (Malvern star Rock trails) this bike is a hard tail Mountain bike I got it a few months back and just started to fix it up. It is a perused bike and I have clean it , lined up the front and rear derailleur, checked for stiff links and worn teeth but all seems fine also have checked for chain stretch and all seem good. The one conclusion I have came up with it the chain is to long by 3 or 4 links but my bike store said that it’s might not be the problem. So if you can help me in any way it would be very helpful.
Jul 18, 2010 01:27 AM
Find all posts by this user Quote this message in a reply
xerxes Offline
Veteran Member

Kent, UK
Posts: 609
Joined: May 2010
Post: #2
RE: Chain slips under foot pressure.
Chain slip when you pedal hard is usually a result of wear on the drivetrain; often happens when you fit a new chain with the old worn cassette.

Does it happen in all the gears, or just one or two in particular?
Jul 18, 2010 02:17 AM
Find all posts by this user Quote this message in a reply
easteregg24 Offline
New Member


Posts: 9
Joined: Jul 2010
Post: #3
RE: Chain slips under foot pressure.
(Jul 18, 2010 02:17 AM)xerxes Wrote:  Chain slip when you pedal hard is usually a result of wear on the drivetrain; often happens when you fit a new chain with the old worn cassette.

Does it happen in all the gears, or just one or two in particular?
Just one or two gears.
Jul 18, 2010 02:49 AM
Find all posts by this user Quote this message in a reply
xerxes Offline
Veteran Member

Kent, UK
Posts: 609
Joined: May 2010
Post: #4
RE: Chain slips under foot pressure.
Look carefully at the cassette, you will probably see that the sprockets you're having trouble with are worn more than the others. You find that the smaller sprockets wear fastest as the load is concentrated on fewer teeth, especially if they also happen to be your favoured gear.

How did you measure the chain wear, with a ruler or a special tool? I find it quite difficult to get an accurate result with a ruler; much easier with one of these:

[Image: 315XG5R9-dL._SL500_AA300_.jpg]

In any case, it's more likely to be a worn chain and cassette than the chain being too long. Chainrings also need replacing if they get badly worn, but they generally last much longer than the rear cassette.

Chains can wear surprisingly quickly in wet, muddy or gritty off road conditions and once the chain is worn, the cassette wears quickly as well. The last chain on my mountain was worn out in less than 1000 miles and because I didn't notice until it was too late, the cassette was ruined too.
Jul 18, 2010 07:04 AM
Find all posts by this user Quote this message in a reply
easteregg24 Offline
New Member


Posts: 9
Joined: Jul 2010
Post: #5
RE: Chain slips under foot pressure.
(Jul 18, 2010 07:04 AM)xerxes Wrote:  Look carefully at the cassette, you will probably see that the sprockets you're having trouble with are worn more than the others. You find that the smaller sprockets wear fastest as the load is concentrated on fewer teeth, especially if they also happen to be your favoured gear.

How did you measure the chain wear, with a ruler or a special tool? I find it quite difficult to get an accurate result with a ruler; much easier with one of these:

[Image: 315XG5R9-dL._SL500_AA300_.jpg]

In any case, it's more likely to be a worn chain and cassette than the chain being too long. Chainrings also need replacing if they get badly worn, but they generally last much longer than the rear cassette.

Chains can wear surprisingly quickly in wet, muddy or gritty off road conditions and once the chain is worn, the cassette wears quickly as well. The last chain on my mountain was worn out in less than 1000 miles and because I didn't notice until it was too late, the cassette was ruined too.

I think your right and I did use a ruler for measuring.
Also i found there's a few teeth missing on the front chaingrings but I don't know if that does anything.

Thanks for the help and any further help you give me.
Jul 18, 2010 02:47 PM
Find all posts by this user Quote this message in a reply
xerxes Offline
Veteran Member

Kent, UK
Posts: 609
Joined: May 2010
Post: #6
RE: Chain slips under foot pressure.
Missing teeth isn't a good sign and you should probably replace the chainrings. Sounds like the whole drivetrain may have seen better days.
Jul 18, 2010 03:40 PM
Find all posts by this user Quote this message in a reply
easteregg24 Offline
New Member


Posts: 9
Joined: Jul 2010
Post: #7
RE: Chain slips under foot pressure.
(Jul 18, 2010 03:40 PM)xerxes Wrote:  Missing teeth isn't a good sign and you should probably replace the chainrings. Sounds like the whole drivetrain may have seen better days.

Thanks for the information i will look into replacing the whole drivetrain. thanks.
Jul 18, 2010 04:32 PM
Find all posts by this user Quote this message in a reply
xerxes Offline
Veteran Member

Kent, UK
Posts: 609
Joined: May 2010
Post: #8
RE: Chain slips under foot pressure.
What chainset do you currently have? With some of the lower cost models, Shimano Alivio and even Deore, you might find that a whole new chainset is less than the price of a couple of new chain rings. It's a bit daft, but do check it out before you go ahead and buy new rings.
Jul 18, 2010 05:55 PM
Find all posts by this user Quote this message in a reply
easteregg24 Offline
New Member


Posts: 9
Joined: Jul 2010
Post: #9
RE: Chain slips under foot pressure.
(Jul 18, 2010 05:55 PM)xerxes Wrote:  What chainset do you currently have? With some of the lower cost models, Shimano Alivio and even Deore, you might find that a whole new chainset is less than the price of a couple of new chain rings. It's a bit daft, but do check it out before you go ahead and buy new rings.

This is my other post that you replied to it has pictures of the bike.

http://forums.bicycletutor.com/thread-1830-post-9150.html
Jul 18, 2010 06:35 PM
Find all posts by this user Quote this message in a reply
xerxes Offline
Veteran Member

Kent, UK
Posts: 609
Joined: May 2010
Post: #10
RE: Chain slips under foot pressure.
Ah, OK, I didn't spot that it was the same auther.

In any case, it's not an expensive chainset and it's probably cheaper to replace it whole than to buy separate chainrings.

Just looking at some prices on the net:
Chainset: Shimano Alivio Chainset Square Taper M410: £27.00
7, 8 or 9 speed cassette: £15.00 to £18.00, not sure what you have.
Chain, around £15.00

So, you could replace the whole drivetrain for around £60.00. Of course, unless you already have the necessary tools, or can borrow them, you will need to buy those as well.

Regarding your other post, I'm not sure what make or model the bike is. I don't think it would have been particularly expensive to start with and only you can decide whether it's worth fixing up. Is everything else OK, or do you suspect that other things will need replacing soon, once you sorted the drivetrain?
Jul 19, 2010 08:23 AM
Find all posts by this user Quote this message in a reply
easteregg24 Offline
New Member


Posts: 9
Joined: Jul 2010
Post: #11
RE: Chain slips under foot pressure.
(Jul 19, 2010 08:23 AM)xerxes Wrote:  Ah, OK, I didn't spot that it was the same auther.

In any case, it's not an expensive chainset and it's probably cheaper to replace it whole than to buy separate chainrings.

Just looking at some prices on the net:
Chainset: Shimano Alivio Chainset Square Taper M410: £27.00
7, 8 or 9 speed cassette: £15.00 to £18.00, not sure what you have.
Chain, around £15.00

So, you could replace the whole drivetrain for around £60.00. Of course, unless you already have the necessary tools, or can borrow them, you will need to buy those as well.

Regarding your other post, I'm not sure what make or model the bike is. I don't think it would have been particularly expensive to start with and only you can decide whether it's worth fixing up. Is everything else OK, or do you suspect that other things will need replacing soon, once you sorted the drivetrain?

Yep everthing else is running fine. thanks for your help
Jul 19, 2010 01:21 PM
Find all posts by this user Quote this message in a reply
Post Reply 


Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  Loose chain on high gears IamTT 1 984 Oct 1, 2014 04:43 PM
Last Post: cny-man
  Bike chain Mbuntin 2 797 Sep 30, 2014 05:51 AM
Last Post: cny-man
  Chain slipping on a self-repaired bike toor 4 846 Sep 17, 2014 04:00 AM
Last Post: cny-man
  Mongoose XR 75 Chain Replacement bbeck2223 3 522 Sep 10, 2014 01:43 AM
Last Post: bbeck2223
  Chain slipping when shifting nishikibike 4 602 Sep 6, 2014 04:35 AM
Last Post: cny-man
  New chain AND cassette, now skipping (a lot) ni4na.347 11 14,218 Sep 2, 2014 01:41 PM
Last Post: ppp333
  Cleaning up an old chain AlienCollective 9 6,716 Aug 30, 2014 01:52 PM
Last Post: Chambeux
  When to lube new chain? barney 4 751 Aug 10, 2014 07:26 PM
Last Post: barney
  My new chain guard nfmisso 18 8,000 Aug 5, 2014 06:24 AM
Last Post: nfmisso
  Chain jumping off Chainring Jedi Mike 1 950 Jul 10, 2014 01:54 PM
Last Post: nfmisso

Forum Jump:


RSS Forum RSS Feeds / Powered by MyBB

ISSN 1918-3445 © Copyright 2007-2010 Bicycle Tutor / Privacy Policy

feed