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  1. apeincalifornia on

    Spray a strong degreaser into the shifters through the cable port. Something as strong as brake cleaner, and spray it inside for a good 5 seconds continuously. The shifters will start working again.

  2. GenericName187 on

    Old shifters can often be resuscitated by spraying some solvent/degreaser in the shifter, then add a little chain lube. The factory grease gets gummed up over time.

    [Park Tool video on shifter flush](https://m.youtube.com/watch?v=DSlj28P6IZA)

    If that doesn’t work, any Shimano compatible 3×8 mountain bike flat bar shifter from Shimano, [Sunrace](https://www.universalcycles.com/shopping/product_details.php?id=109054&attribute=271499&gad_source=1&gbraid=0AAAAAD8_PrV4ElKVyIqTdyAlIv8Whn-IQ&gclid=EAIaIQobChMI-fzL7r2rhwMVu0b_AR1cwAv8EAQYASABEgJn3vD_BwE), or [Microshift](https://www.universalcycles.com/shopping/product_details.php?id=74339&category=5547) will work.

    Ths SL-M315 also comes in 7 speed, make sure you get the correct number of speeds to match your cassette.

    Edit- I wouldn’t count on AliExpress parts being genuine Shimano

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