Miss-fitting chainset rings?

Houlio99 · Apr 10, 2013

Evening,

I'm attempting to put together a new Deore chainset. Old cranks cleaned up, new rings purchased from CRC. Inner and outer rings go on fine, middle one just seems to be the wrong size or the spider is not the right model of deore?

Appreciate your thoughts on this?

JT

getin · Apr 11, 2013

Looks fine to me but Do all the bolt's fit in?

02gf74 · Apr 11, 2013

are you saying the bolt holes do not line up?

notice the notch on the inside of the ring, at 12 o'clock position - this usually should be in line with the crank - in your case, rotate the ring by 90 degree/1 bolt hole to the right.

Houlio99 · Apr 11, 2013

It's the grey lumps (circled below). Wondering if I got a funny shaped spider?

Raging_Bulls · Apr 11, 2013

Either that or you have a funny-shaped chainring.

If the bolts all fit the holes, I wouldn't worry about it.

Chopper the ex Copper · Apr 11, 2013

I think those bumps are to stop the chain getting wedged between the granny and middle rungs if it comes off.

jonnyboy666 · Apr 11, 2013

this was a shimano-ism to make you buy the specific rings for the chainset to protect their spares market. even some of their own rings don't fit but the bolt pattern is right.

simplest thing to do is carefully (or hamfistedly, which ever you capable of!) file the crank arm till they fit, had to do it on some xt cranks to make TA rings fit a while ago.

Houlio99 · Apr 11, 2013

Thanks all, will get the files out tonight!

JT

cyfa2809 · Apr 11, 2013

File the ring not the arm!! Takes 2 seconds. You will probably only have to file 2 of the tabs. Also looks like the correct orientation? The pin by the arm.

old_coyote_pedaller · Apr 11, 2013

I had the same problem with a set of Shimano cranks and new Shimano rings.
As has been said, file the ring not the cranks, it's much easier. The ring is disposable, eventually, due to wear, I'd rather keep the cranks original in case the next set of rings actually fitted without filing.

Miss-fitting chainset rings?

Houlio99

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