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Delboy
Joined: 10 May 2016
Posts: 31
Location: saltburn by the sea
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 Posted: Sun Aug 28, 2016 11:15 pm Post subject: chain 'jumping' |
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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
Posts: 1512
Location: Leicester
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| Posted: Tue Aug 30, 2016 12:35 pm Post subject: |
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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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Marin 2013 Indian Fire Trail 29er (best Marin ever) |
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Delboy
Joined: 10 May 2016
Posts: 31
Location: saltburn by the sea
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| Posted: Tue Aug 30, 2016 5:20 pm Post subject: |
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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
Joined: 18 Jan 2013
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Location: Leicester
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| Posted: Wed Aug 31, 2016 8:49 am Post subject: |
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This isn't a Paunch its a fuel tank for a Marin
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
Posts: 1892
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| Posted: Fri Sep 02, 2016 10:02 am Post subject: |
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| 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
Posts: 2140
Location: South Wales Valleys
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| Posted: Fri Sep 02, 2016 11:28 am Post subject: |
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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
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Magnus
Joined: 18 Jan 2013
Posts: 1512
Location: Leicester
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| Posted: Fri Sep 02, 2016 12:18 pm Post subject: |
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| 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 |
+ 1. Agreed that's about right for me also
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This isn't a Paunch its a fuel tank for a Marin
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
Posts: 29321
Location: Under Whitestone-Cliffe on the Lake.
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| Posted: Fri Sep 02, 2016 8:20 pm Post subject: |
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| 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 |
Good formula. 
And very accurate too.
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Threevok
Joined: 30 Jul 2012
Posts: 2140
Location: South Wales Valleys
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| Posted: Fri Sep 02, 2016 10:14 pm Post subject: |
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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
Posts: 265
Location: Lincoln
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| Posted: Sat Sep 03, 2016 4:14 pm Post subject: |
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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
Posts: 31
Location: saltburn by the sea
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| Posted: Mon Sep 05, 2016 9:19 am Post subject: |
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new cassette and chain, job now sorted, thanks all for input
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Delboy
Joined: 10 May 2016
Posts: 31
Location: saltburn by the sea
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| Posted: Mon Sep 05, 2016 9:25 am Post subject: |
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?
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Threevok
Joined: 30 Jul 2012
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Location: South Wales Valleys
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| Posted: Mon Sep 05, 2016 11:10 am Post subject: |
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You don't know what Strava is ????? 
Oh, to be so young and innocent again
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Delboy
Joined: 10 May 2016
Posts: 31
Location: saltburn by the sea
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| Posted: Wed Sep 07, 2016 11:45 pm Post subject: |
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just did the google thimingybob,  are you just using it as an online log?
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