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Replace MC-M550 Chainring

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Replace MC-M550 Chainring

Old 06-30-17, 12:31 PM
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Seminoleslarry
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Replace MC-M550 Chainring

I have worn out the front chainrings on a 1990ish Cannondale SH600 road bike. It has 3 x 7 gears. I replaced the rear gears and chain already. The front chainring set is a Shimano SG FC-M550 with 46,36,24 teeth. The BCD is 110mm. Unfortunately they don't make these anymore. The chainring has pins that I can see, but I'm not sure about whether there are ramps or not. What type of replacement chainring would be suitable for this bicycle?
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Old 06-30-17, 01:13 PM
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You can use just about any 110 BCD chainrings for the outer two positions. The innermost ring has a 74 mm BCD. The chainrings on FC-M550's I'm seeing on Velobase and elsewhere don't have ramps or pins, so something like these Sugino rings would be a direct replacement. Of course, you can use ramped and/or pinned rings if you'd like.
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Old 06-30-17, 01:29 PM
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Shimano, FSA, and Vuelta sell chain rings, with ramps/pins, that will work better than your stock rings.

chances are that your smallest ring is not worn enough to warrant replacement... and USUALLY, only the middle ring gets worn out, unless you're using the bike to commute on pavement a lot.
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Old 06-30-17, 01:30 PM
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TA Chainrings
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Old 06-30-17, 02:12 PM
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Does it look like mine?

VeloBase.com - Component: Shimano FC-M550, Deore LX

The chainrings have no pins or ramps, just an anti-drop pin, and a couple of teeth that are strategically shorter than the others to ease shifting. Any plain 110 BCD chainrings will do the job, and they are plentiful and cheap.
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Old 07-01-17, 11:28 AM
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Tools?

Thanks for the great advice. Will I need any special tools other than allen wrenches if I want to replace only the middle 36 tooth chainring?
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Old 07-01-17, 01:55 PM
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Originally Posted by seminoleslarry
Thanks for the great advice. Will I need any special tools other than allen wrenches if I want to replace only the middle 36 tooth chainring?
A chainring nut wrench is nice for holding the nut still while loosening or tightening the chainring bolts (with a 5mm allen). They're only a couple bucks. But that's about it -- you don't even need to take the crankarm off to swap the outer rings.


(Image pilfered from the Park Tool site I linked to.)
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Old 07-02-17, 11:05 AM
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Thank you for the tip. I've already ordered the tool.
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Old 07-02-17, 01:58 PM
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Recommendation: after removing all the chainring bolts and nuts, clean them thoroughly. After that, apply grease to the threads and to the surfaces of the chainrings where they meet the crankarm. This will help prevent annoying, impossible-to-track-down squeaks. (Don't ask me how I know this.)
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