I'm glad you said that. I was thinking the same when i read it. It's all voodoo magic to me lolThink of explaining that to a child who just about knows that a bike has two wheels and a chain!!
B tension is totally new to me, it’s a turbo Levo if that makes any difference.
That’s what it sounds like to me... chain trying to climb but not making it.if the cable is a bit tight it can pull the mech over a bit and the chain will be trying to climb up on to the next cog, not quite making it and then slipping back hence the clicking.......maybe
It's not the smallest but the second one.not all that strange if only in the smallest sprocket.
Before you buy a new cassette. a replacement 13T sprocket will cost you less than a fiver.
sorry. I can't remember if you said the chain was fine (wear wise) or not
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