Annoying little mysteries – new chain content
If only. The mech is bequtifully centred on all sprockets.
I can actually see the bearing start to ride up on the tooth causing the next link in the chain to lift and effectively shorten so it soo rides up – even more. Eventually it gets to the point where everything slips down into the next…er…what the oposite of the tooth….valley / dip ?Posted 4 years agomintimperialSubscriber
Hmm. Weird, if it’s only doing it on the joining link. Get another quick link, they’re cheap and it’s useful to have spares. Even an old SRAM one or whatever should work for debugging purposes. Stick that in instead of the Connex one, if it fixes it there’s your problem. If it doesn’t then it probably is a worn cassette.Posted 4 years ago
The Facts :
New connex 9 speed chain
Fairly new SRAM PG 990 9 speed block
New long cage and jockey wheels on XO rear derailleur
X9 fhifters – not so new but still going strong.
New BB (just so you have all the changes)
Fitted everything the other day and in all but the smallest cog on the back everything is fine and dandy – near silent – including under load.
On the smallest cog the chain skips ! FWIW I don’t spend massive amounts of time in the 11 tooth sprocket.
After forensic research I can say categorically that it is not :
a. Riding up on the next cog
b. Has no stiff links
It is :
a. Is the correct chain for the set up
b. Riding up on the teeth of the small cog (on the bearing not the side plates) – at the connex quick link, just after it leaves the upper jockey wheel (which is perfectly centred over the sprocket)
a. The quick link is too small – I have checked that the 2 pieces seat together correctly – they do. I have also tried a different quick link same result.
b. The teeth on the small cog are further apart than they should be – wear – except all other links slide in beautifully.
What the chuff is going on ?
Help before I go all Basil Fawlty and start beating the bike with a branch regarding the warnings I’ve given it.Posted 4 years ago
But a bearing by definition is separated by moving “bearings” – hence the name. 🙂
(or their roller format)
A bearing is manufactured to be tight and precise, a roller on a chain is (by comparison) only roughly round and is loose to flop about over the grime.
I mean, I’m being totally pedantic, but it might help you get a conversation started faster one day explaining how the rollers of your chain are slipping over the teeth rather than explaining to a confused mechanic where the bearings are in your chain. 🙂Posted 4 years agogranny_ringSubscriber
To put it basically, the L screw sets up 1st gear and stops chain falling into the spokes, H screw sets up the top gear and stops the chain falling off the cassette.
The B screw is for sorting the gap when in top gear and the top jockey wheel to make sure the chain has enough clearance, if you get my drift….Posted 4 years ago
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