Worn GRX chainring after 2500km

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  • I fitted a GRX 600 2x11s 46/30 chain set to my Ultegra Di2 equipped bike in Jan. Now with approx 2500km worth of riding, quite a bit of it off road, I'm getting chain slip under heavy load and the teeth on the big ring seem pretty worn.

    I realised a bit late that the chain was very worn and replaced it, sounds much better but that's when the slipping started. I've not been great with cleaning/maintenance but do have a proper deep clean every so often. I just can't work out how the chainring could be worn so quickly.

    Any thoughts? pics of the chainring attached.

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    • Screenshot 2020-05-18 at 12.14.10.jpg
    • Screenshot 2020-05-18 at 12.21.32.jpg
  • Yeah 2500km on a large chainring isn't great, but if you've been pretty slack at looking after your chain you're going to see some accelerated wear.

    It doesn't look totally cooked to me though - I reckon you've worn your cassette more than anything. A very worn chain will wear out a cassette very quickly. Try replacing that first - if it doesn't solve the issue then chainrings are the next item to swap out.

  • Cheers @amac090 - I have two wheelsets and switch between them so not really sure how many km are on the cassette, but between the two of them it's almost 9000km so you are probably right about the cassette.

  • In my limited experience, mostly from cx, mud and dust can really accelerate wear on these parts. Especially if there is any clay or sand involved. 2500km doesn't seem like a lot but if it was getting a good pasting every ride without a thorough clean that doesn't seem out of the ordinary.

  • if it is slipping, it is going to be over the rear sprocket, not round the front chainring.

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Worn GRX chainring after 2500km

Posted by Avatar for cjr @cjr