Old 05-01-22, 09:59 AM
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mjbike
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New GX Eagle AXS: Problem with smallest sprocket

Hi,
yesterday I got a new full suss. It is a Trek Fuel EX 9.8 GX. Overall a great bike. Normally it would come with Eagle GX but the bike shop upgraded it to GX AXS for me.
It is brand new.
Overall the GX AXS shifting is super smooth, accurate and fast.
There is only one problem with the smallest sprockets. It feels as if the chain is jumping a bit on the 11th and 12th gear (the smallest sprockets).
I added a bit of chain lube and this mostly solved it for the 11th gear but the 12th gear (the one with only 10 teeth) is still a problem. After about every 100m it makes a noise and it feels as if the chain has trouble really grabbing the sprocket. For about half a second it seems to let go of the sprocket and then grabbing it again with a loud noise.
This does not only happen under extreme load but also when paddling lightly on a flat road.
It doesn't try to shift up to the 11th gear nor does it fall off to the right and off the cassette. Shifting up/down between the 11th and 12th gear is smooth. Only riding the 12 year is not that much fun.

I hope my description of the problem is clear.

Thanks for any help
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