Gears feel rough

For discussions about bikes and equipment.
Fraz101
Posts: 146
Joined: 15 Feb 2018, 12:47pm

Gears feel rough

Postby Fraz101 » 26 Mar 2018, 8:23pm

When I’m pedalling every gear feels rough except 7th (smallest ring).

Gear change is perfect in every gear however.

I’ve recently replaced rear free wheel,chain,cables etc.

It doesn’t sound rough when pedalling,it just feels rough through the pedals.

Anyone suggest what it could be.

Chain is clean and well lubed

https://youtu.be/AExqWWtkgfY




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Last edited by Fraz101 on 26 Mar 2018, 8:23pm, edited 2 times in total.

David9694
Posts: 699
Joined: 10 Feb 2018, 8:42am

Re: Gears feel rough

Postby David9694 » 26 Mar 2018, 9:07pm

Hanger alignment is off?

Severely worn chain ring vs your new chain?

Fraz101
Posts: 146
Joined: 15 Feb 2018, 12:47pm

Re: Gears feel rough

Postby Fraz101 » 26 Mar 2018, 9:10pm

David9694 wrote:Hanger alignment is off?

Severely worn chain ring vs your new chain?


Excuse my ignorance but what do you mean by hanger alignment ?




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philvantwo
Posts: 1212
Joined: 8 Dec 2012, 6:08pm

Re: Gears feel rough

Postby philvantwo » 26 Mar 2018, 9:22pm

Look up park tool hanger alignment on YouTube.

Fraz101
Posts: 146
Joined: 15 Feb 2018, 12:47pm

Re: Gears feel rough

Postby Fraz101 » 26 Mar 2018, 9:31pm

It changes up and down the gears perfectly. If the rear hanger was out of alignment would it not affect gear shifting?


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David9694
Posts: 699
Joined: 10 Feb 2018, 8:42am

Re: Gears feel rough

Postby David9694 » 26 Mar 2018, 9:46pm

First of all with derailleurs, do as you’re doing and listen to and feel what the bike is telling you. I’ve not been sensible to this and wrecked a couple of derailluers and chains.

Is the rear wheel in straight? Presumably you’re running a 7 speed chain with your 7 speed freewheel? Did you replace the chain with the same number of links as before?

Where the rear derailleur attaches to the bike - that’s the hanger. If your bike is steel, the hanger will be part of the rear dropout (I.e where the wheel goes in) or on other materials it’s separate and is designed to break (rather than have the frame break - expensive). It’s a vulnerable spot and the symptoms from misalignment are usually more evident at one or other end of the gear.

Take a look to see if the hanger is true. If you’ve got a long bolt that fits it, remove the derailleur and screw it in as this will help accentuate any problems to your eye and also help you straighten it (at your own risk of course) if needed; don’t forget to look from behind and above.

A replaceable hanger will unscrew - you’ll need it to find a replacement - there are hundreds of different ones out there, but some very public spirited websites carrying a wide range of them - buy two when you find your match.

Brucey
Posts: 42984
Joined: 4 Jan 2012, 6:25pm

Re: Gears feel rough

Postby Brucey » 26 Mar 2018, 10:28pm

do double-check that the chain is routed correctly through the rear mech, and that the inner cage plate of the mech is not on upside down. Also check that the b-tension adjustment is correct.

If in doubt post a photo or two.

cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~

Fraz101
Posts: 146
Joined: 15 Feb 2018, 12:47pm

Re: Gears feel rough

Postby Fraz101 » 26 Mar 2018, 10:52pm

Not the best pictures
ImageImage


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Fraz101
Posts: 146
Joined: 15 Feb 2018, 12:47pm

Re: Gears feel rough

Postby Fraz101 » 26 Mar 2018, 10:56pm

ImageImage


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Brucey
Posts: 42984
Joined: 4 Jan 2012, 6:25pm

Re: Gears feel rough

Postby Brucey » 26 Mar 2018, 11:10pm

your hanger is bent (inwards) and this will cause some gears to run rough and be noisy, even when the gears are adjusted as well as they can be.

The chain routing is fine and the b-tension isn't a million miles out but a turn or two inwards might make things better in bottom gear.

cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~

Fraz101
Posts: 146
Joined: 15 Feb 2018, 12:47pm

Re: Gears feel rough

Postby Fraz101 » 27 Mar 2018, 6:55am

Bottom gear (smallest ring) is the only gear that feels ok.

I turned b screw a little inwards and 1-6th feels a lot rougher now.




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Marcus Aurelius
Posts: 1672
Joined: 1 Feb 2018, 10:20am

Re: Gears feel rough

Postby Marcus Aurelius » 27 Mar 2018, 8:13am

Check the tensioner ( Jockey wheels / the little cogs in the mechanism) for damage, and bearing function. Also, check that the hanger is butted up against the B screw ( check that there isn’t a gap between the end of the b screw and the hanger)

hamster
Posts: 3786
Joined: 2 Feb 2007, 12:42pm

Re: Gears feel rough

Postby hamster » 27 Mar 2018, 9:26am

Just one silly thought. Check the pedals - if you have one with a rough bearing it feels like the drivetrain.

pwa
Posts: 13898
Joined: 2 Oct 2011, 8:55pm

Re: Gears feel rough

Postby pwa » 27 Mar 2018, 9:30am

Also check the jockey wheels. One of them might be shot. That would make it feel rough.

Brucey
Posts: 42984
Joined: 4 Jan 2012, 6:25pm

Re: Gears feel rough

Postby Brucey » 27 Mar 2018, 9:36am

Brucey wrote:your hanger is bent (inwards) and this will cause some gears to run rough and be noisy, even when the gears are adjusted as well as they can be.

The chain routing is fine and the b-tension isn't a million miles out but a turn or two inwards might make things better in bottom gear.


Fraz101 wrote:Bottom gear (smallest ring) is the only gear that feels ok. I turned b screw a little inwards and 1-6th feels a lot rougher now.


Bottom gear = largest sprocket

No point in fiddling with the b tension screw if the mech hanger is bent; you should fix that first.

cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~