chain 'jumping'
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Delboy



Joined: 10 May 2016
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Location: saltburn by the sea

PostPosted: Sun Aug 28, 2016 11:15 pm    Post subject: chain 'jumping' Reply with quote

been out twice today to put some miles in , both times the chain has jumped when I put weight on the pedals after almost coming to a stop, then going again without changing gear, cogs seem ok not worn and the chain stretch gauge shows no great stretch, gears select and change ok any Ideas? this has never happened before
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Magnus



Joined: 18 Jan 2013
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PostPosted: Tue Aug 30, 2016 12:35 pm    Post subject: Reply with quote

in my experience providing the indexing is set correctly, the derraliers are straight and secure and there is no excessive play in the cassette bearings it usually turns out to be the cassette even though you cant see the problem. usually remedied by fitting a new chain and cassette together.

try putting the chain on to the gear that slips the most, get someone to stand on the pedal and put load on the chain, then look for daylight between the chain and the sprocket. look to see if the chain is riding up the teeth instead of sitting snugly at the bottom.

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Delboy



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PostPosted: Tue Aug 30, 2016 5:20 pm    Post subject: Reply with quote

took it to the local shop their chain gauge showed the chain was very overstretched, put on a new chain, still jumping on no 6 cog so ordered a new cassette, thanks for help
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Magnus



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PostPosted: Wed Aug 31, 2016 8:49 am    Post subject: Reply with quote

Wink Cool
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Raleigh Shimano 105 team triathlon

Lotus one plus one Columbus tubing 3 x butted
Campag chorus group including wheels

Marin Rocky Ridge 2001

Marin 2013 Indian Fire Trail 29er (best Marin ever)
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Robmet



Joined: 04 Jan 2010
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PostPosted: Fri Sep 02, 2016 10:02 am    Post subject: Reply with quote

Delboy wrote:
took it to the local shop their chain gauge showed the chain was very overstretched, put on a new chain, still jumping on no 6 cog so ordered a new cassette, thanks for help


When its really worn and you replace the chain and cassette you normally find it jumps on the chainrings and you have to replace those too.
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Threevok



Joined: 30 Jul 2012
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PostPosted: Fri Sep 02, 2016 11:28 am    Post subject: Reply with quote

Rule of thumb for me I have found with the GT

2-3 chains per cassette
2-3 cassettes per crank-set

Crank-sets would probably last longer by simply changing the worn chain-rings in question - but I don't pay that much for them (usually Deore) and simply changing the chain-rings isn't that much cheaper than buying a new crank-set.

Besides, they usually look tatty by this time anyway Wink

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Magnus



Joined: 18 Jan 2013
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PostPosted: Fri Sep 02, 2016 12:18 pm    Post subject: Reply with quote

Threevok wrote:
Rule of thumb for me I have found with the GT

2-3 chains per cassette
2-3 cassettes per crank-set

Crank-sets would probably last longer by simply changing the worn chain-rings in question - but I don't pay that much for them (usually Deore) and simply changing the chain-rings isn't that much cheaper than buying a new crank-set.

Besides, they usually look tatty by this time anyway Wink


+ 1. Agreed that's about right for me also

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Raleigh Shimano 105 team triathlon

Lotus one plus one Columbus tubing 3 x butted
Campag chorus group including wheels

Marin Rocky Ridge 2001

Marin 2013 Indian Fire Trail 29er (best Marin ever)
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Gunner



Joined: 15 Apr 2007
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Location: Under Whitestone-Cliffe on the Lake.

PostPosted: Fri Sep 02, 2016 8:20 pm    Post subject: Reply with quote

Threevok wrote:
Rule of thumb for me I have found with the GT

2-3 chains per cassette
2-3 cassettes per crank-set

Crank-sets would probably last longer by simply changing the worn chain-rings in question - but I don't pay that much for them (usually Deore) and simply changing the chain-rings isn't that much cheaper than buying a new crank-set.

Besides, they usually look tatty by this time anyway Wink



Good formula. Laughing Laughing Laughing

And very accurate too. Wink

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Threevok



Joined: 30 Jul 2012
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PostPosted: Fri Sep 02, 2016 10:14 pm    Post subject: Reply with quote

Oh and just to add to that..

I Strava every ride I do as it's a very good record of how many miles each part has done.

That way, you know well in advance when a part is due for service or replacement

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Nik Gnashers



Joined: 30 Dec 2014
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PostPosted: Sat Sep 03, 2016 4:14 pm    Post subject: Reply with quote

I change chainring with cassette (single chainring), it certainly looks worn by the time the cassette needs doing.
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Delboy



Joined: 10 May 2016
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PostPosted: Mon Sep 05, 2016 9:19 am    Post subject: Reply with quote

new cassette and chain, job now sorted, thanks all for input
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Delboy



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PostPosted: Mon Sep 05, 2016 9:25 am    Post subject: Reply with quote

Quote:
Strava
?
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Threevok



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PostPosted: Mon Sep 05, 2016 11:10 am    Post subject: Reply with quote

Delboy wrote:
Quote:
Strava
?


You don't know what Strava is ????? Shocked


Oh, to be so young and innocent again Laughing Laughing Laughing Laughing

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Delboy



Joined: 10 May 2016
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PostPosted: Wed Sep 07, 2016 11:45 pm    Post subject: Reply with quote

just did the google thimingybob, Embarassed are you just using it as an online log?
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