• I've got SRAM Red 11 group on a bike I bought used. Now I want to fit 4 bolt cranks. Do I need chainrings compatible with Shimano road 11 speed? What's the thickness of the teeth? I don't know what the chain is but it shifts well so I assume it's 11 speed.

  • I've got SRAM Red 11 group on a bike I bought used. Now I want to fit 4 bolt cranks.

    Y tho?
    Don't worry about the thickness of the teeth, buy 11 speed rings and they'll be fine.

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