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This is almost certainly very simply, but how do you undo the chainring bolts on the SRAM red chainset? I can fit a 5mm (or 8mm can't recall now) hex head into the black screws, but they just spin on the spot. I have tried both the front and back. Some seem harder to spin than the others, but I can't work out how to remove them.

SRAM red crankset

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I suspect there's a sort of nut on the back, with a slot for a screwdriver. Difficult to reach without a specially shaped screwdriver, though.

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Ahh thanks - you got me thinking. Not quite right, but a 6mm on one side, and a 5mm on the other actually does it – J.S. Aug 16 '11 at 3:43
Yeah, I was thinking that that would likely be the updated design, but my bikes are too old to have it. – Daniel R Hicks Aug 16 '11 at 11:40
@j.s. - Can you add your comment as an answer and accept it? – Mac Aug 18 '11 at 9:06
Yeah, that was the "specially shaped screwdriver" I was talking about. – Daniel R Hicks Aug 23 '11 at 15:30

As noted in the comments, you need to use a 6mm hex on the front and a 5mm on the back. Using these both at once will engage the bolts, and they will undo

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