Not all chainring bolts are the same
ed1973 Posts: 278
I am currently adjusting the chainline and have to push my chainring in around 2mm. I have the spacers but the 2mm increase has meant my chainring bolts now aren’t long enough. I have an SLX M7000 crank that have a useable length of 8mm, but I now need 10mm. Not all chainring bolts are the same as I have found out and the width of these is 7.7mm. Any suggestions out there?
If you must try It’s probably worth popping into a local bike shop. They probably have a box in the workshop full of them.
Like Mully said, maybe it's not worth the hassle?
I've got the non Boost M7000 11-1 crankset on my Boost bike with a 49-50mm chainline and I still get the chain coming off the big cog after about two back pedal rotations.
P.S. As far as I know the single piece crank bolts on mine are the standard M8x8.5mm and I reckon you should be able to find some longer replacements easily enough. If I was in your predicament, maybe I'd just buy the same crankset I've got.
My cheap ebay chainring also says for M8 bolts, I guess for the mounting hole size and they're snug.
Even if you find longer bolts I still don't think 2mm further in would sort out back pedalling issue on non Boost bike with a 52.7mm (near enough, still a Boost chainline). 😬
Not acceptable if you're planning on doing what Danny MacAskill does and jumping across rock obstacles etc? 😮
I guess you might wear your parts out a bit quicker.