Graunchy Pedalling

steelo · June 2007

Can anyone help?

I've had my bike for 3 weeks now, its been back to the shop twice to have the rear deraillieur tightened as the cable has bedded in etc. but I am getting a kind of graunching/dodgy bearing noise and feeling through the pedals as I lightly rotate them, i.e. when there isn't much power being put down.

Any ideas?

Is it simply the chain and chainrings bedding in?

joshleb · June 2007

Is the noise still there when the power is put down hard?

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nicklouse · June 2007

if you are not happy take it back. just about all pedal feel rough btw.

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UH DH · June 2007

Yes! I am not the only person who refers to it as being graunchy. Always thought it was just me.

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nicklouse · June 2007

Tavy, Graunchy is a well known technical term.

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forcutty · June 2007

Try oiling them, the bearings have probably seased up with either crap or through use. spray with WD40 (other water inhibriaters are available I,E AC90), loosen up then add oil. or just take back to bike shop and they will probably do it for you.

steelo · June 2007

As its a Specialized Rockhopper I was expecting a decent set of pedals, they are only a few weeks old so it can't be through wear and tear. The bloke in the shop rode it up and down the street, after re-tightening the deraillieur and said the bike was fine!

I'll try some dry lube on them tonight and see if it makes a difference.

ride_whenever · June 2007

Usually new pedals need to be stripped and regreased after a couple of weeks, then they are fine. Just open them up and pump them full of grease. Should at least make them quiet.

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steelo · June 2007

Could you give me some advice about which grease to use? I have dry lube. Also, the last time I took a pedal to bits I lost one of the small ball bearing and didn't rotate very well after that, and the rest of the ball bearings were an absolute nightmare to get back in!

hamboman · June 2007

this is complete b*llsh*t - if its making a granuchy sound a bearing has prob come and it's a faulty product. Take it back and ask for them to be changed and don't take and sh*t from them!

ddoogie · June 2007

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by hamboman

this is complete b*llsh*t - if its making a granuchy sound a bearing has prob come and it's a faulty product. Take it back and ask for them to be changed and don't take and sh*t from them!
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hamboman · June 2007

Thanks man.

Something had just gone wrong at work and I guess I was letting off some bottled up steam!

steelo · June 2007

So anyway - attractive though the suggestion is to take no sh!t - I would also like to find and cure the problem, hopefully it is not down to a faulty product!

Noodoo · June 2007

can I just check something?

You say that you can feel it through the pedals yes?

Is it actually the pedals causing the graunchy noise/feeling?

how do the pedals feel if you get off the bike and actually rotate each pedal? ie, don't turn the cranks, just rotate the pedal on it's bearings.
Can you hear/feel it then?

What I'm getting at here, is:

Could it be the bottom bracket? You would feel that through the pedals, but it wouldn't actually BE the pedals... if you catch my drift.....

nicklouse · June 2007

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by steelo

So anyway - attractive though the suggestion is to take no sh!t - I would also like to find and cure the problem, hopefully it is not down to a faulty product!
<hr height="1" noshade id="quote"></blockquote id="quote">

what are the pedals?

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steelo · June 2007

The pedals came with the bike 3 weeks ago, brand new Specialized Rockhopper Disc. They are supposed to be Specialized Alloy 1 pc. but i'm not too sure. I've done the 'grab both arms of the crank and wiggle it' test and the BB is secure as I can tell. I haven't rotated just the pedals, will try that tonight. Personally I think it may either be the pedals, the chain on the big front cogs, or possibly the rear, or a bearing elsewhere!?!

nicklouse · June 2007

pedals tend to be cheap on bikes that come with them.

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Noodoo · June 2007

what do you mean by 'The chain on the big cogs'? does it only do it on the 2 largest rings? Just the largest?

are we looking at a mal adjusted front mech?
the freewheeling test will tell you anyway...

steelo · June 2007

Definitely the middle chainring, pretty certain on the large as well, not used the granny gear as yet!

But it is a noise/sensation that occurs while pedalling along a pretty flat road using the middle chainring.

Could it be when the chain is running in a slight 'S' from front to rear, so it would the edges of the chain rubbing against the rear cassette teeth while everything beds in?

I'm almost certain its not this but could there be a chance it may be the tread pattern on the tyres? Surely not, but now I think about it!

Noodoo · June 2007

i'd be more inclined to think that it was the chain catching on the front mech. try turning your adjusting nut on the front mech shifter 1/2 a turn one way and try riding.
If it's worse or more prominant, turn the adjuster 1 full turn the opposite way and see what happens.

mbukjames · June 2007

I had this problem about a week back, Clicking noise mine made. Took it back to where I got it and they said the Bottom Bracket is loose so they tightened it for me and its fine..[;)]

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steelo · June 2007

Well i've just had a short ride, made a note of when the chain is 'graunching' and there are a few different problems/noises I can identify!

1. The chain rubs the topside and bottomside of the front deraillieur when in the middle front chainring, and then the uppermost and lowermost rear sprockets. Seems to me like the front chainguide is too narrow for the bike!

2. It feels like grit in the bearings somewhere producing the graunching sound. Just had the hose and muc-off spray out and given all the rotating components a good clean and scrub, although there is still black oil/crud in the chain links. Does sound better but still not perfect. I'll try it again when I have re-lubed it with dry lube!

...the battle continues!

Graunchy Pedalling

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