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PostPosted: Thu Nov 07, 2013 10:31 am 
Dirt Disciple

Joined: Mon Jun 25, 2012 6:59 pm
Posts: 25
Location: Southampton
OK folks, I've got a question...

I have just set my bike up SS. I've got a new chainring, a new cog and spacers on the back, a new chain, and a spring mounted tensioner (one that pushes clockwise, not anti-clockwise).

When I push down hard on the pedals (starting from stationary, climbing, etc) I get a horrible jolting sensation, accompanied by a clunk, and a weird squeak. This happens with every pedal revolution.

Why?

All bolts are tight and the chainline is almost perfectly straight. The BB is old. The freehub is a couple of years old and has a tiny amount of side-to-side play. But I didn't have this problem last week when I had gears and everything on the same BB and hub. The chain is possibly a touch too long, which because of the tensioner means the chain is only wrapping around the rear cog from the 8 o clock to 12 o clock position.

My thoughts are either the chain is skipping because I don't have enough of it wrapping round the chain, or I'm getting the jolting because the pawls in the freehub are skipping. I can't see how the BB or pedals could be causing the jolting.

All thoughts are welcome because it is doing my head in!

Cheers.


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PostPosted: Thu Nov 07, 2013 3:47 pm 
Dirt Disciple

Joined: Mon Jun 25, 2012 6:59 pm
Posts: 25
Location: Southampton
Ignore my previous post. I reckon I've got it sorted. Ta.


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PostPosted: Mon Nov 11, 2013 8:46 pm 
South East Deputy AEC
South East Deputy AEC
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Joined: Mon Feb 22, 2010 7:27 pm
Posts: 4398
Location: Angmering
what was it??


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PostPosted: Tue Nov 12, 2013 9:42 am 
Dirt Disciple

Joined: Mon Jun 25, 2012 6:59 pm
Posts: 25
Location: Southampton
Not enough of the chain wrapping round the rear cog due to a too-long chain and an over zealous chain tensioner. I only had 5 or 6 teeth in the chain at any one time, so it kept slipping whenever I pedalled hard. Three links out and problem solved, thanks to the sensible heads on this site. I was ready to start dismantling the hub...


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PostPosted: Sat Dec 07, 2013 2:58 am 
Dirt Disciple

Joined: Sat Dec 01, 2012 4:31 am
Posts: 63
Location: Toronto
Image


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PostPosted: Sat Dec 07, 2013 11:03 am 
Retro Guru

Joined: Wed Apr 24, 2013 10:17 pm
Posts: 652
Location: worcester
Bone Machine wrote:
Image



nice 8-) more pics!!


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PostPosted: Mon Dec 09, 2013 2:42 pm 
Retro Guru

Joined: Sat Apr 11, 2009 4:27 pm
Posts: 988
Location: Devon
I love those Norco's we rarely get to see anythign but their big 'falling down mountain' bikes over here.

What fork is that?


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PostPosted: Tue Dec 10, 2013 12:25 am 
Dirt Disciple

Joined: Sat Dec 01, 2012 4:31 am
Posts: 63
Location: Toronto
The fork is Brand-X carbon that I got from CRC at a steep discount.

The frame has an eccentric bottom bracket.

Image

Image


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PostPosted: Tue Dec 10, 2013 10:42 pm 
Gold Trader / MacRetro rider
Gold Trader / MacRetro rider
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Joined: Mon Feb 11, 2008 12:03 pm
Posts: 5130
Location: held captive by baby haggis in a cave in Scotland
I agree with the above, that is a lovely Norco.
How does it ride with that fork? besides weight etc is it similar to standard?

Jamie


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PostPosted: Sat Dec 14, 2013 3:01 pm 
Gold Trader / MacRetro rider
Gold Trader / MacRetro rider

Joined: Sun Sep 04, 2011 11:33 am
Posts: 3099
Location: Riding my Woodsie.
My latest build.

Image

Image

Image

Image


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