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Replace Riveted On Chainring?

Old 06-19-19, 07:04 AM
  #1  
Payton1221
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Replace Riveted On Chainring?

Thread title should be "Replace Riveted Chainring," because I bought a Motobecane Elite Eight bike that came with a 42T chainring riveted to the spider, and I'm wanting to replace it with a 38T chainring. I'd like to do the work myself, and if I do it, I don't want to open the bottom bracket. I'm thinking about drilling out the rivets to remove the existing chainring and then bolting on a new (~$15) chainring on with self-locking nuts.

Option 2 would be to have my LBS provide a new crankset and install it for me. What do you think the cost of this would be?

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Old 06-19-19, 08:14 AM
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fietsbob
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Replace the whole crankset with one that the chainrings can be replaced

Option 2 would be to have my LBS provide a new crankset and install it for me. What do you think the cost of this would be?

Call on the phone and ask those who will be doing the work, for an estimate.

How would 'we' Know, we won't be doing the job, which is unseen.. They may only say after you bring it in .
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Old 06-19-19, 08:54 AM
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Crankset isn't difficult to swap out. Just need to make sure the new one is compatible with the BB interface.

I had a bent chainring on my Montague years ago, and rather than try to replace the cheap riveted one, I went ahead and bought a Hussefelt DH crankset and mounted that. I was pretty hefty at the time, and figured I'd be better off with a downhill crankset... not sure if I was overcautious, but it's held up very well.
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Old 06-19-19, 09:44 AM
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Well....if you want to get rid of the current chain ring then your only real risk is you can't get the new one on properly. If you destroy the current one...who cares? You don't want it anyway.

You can drill the rivets. You probably don't need to remove the crank arm unless the arm is blocking one of the rivets.

Putting the new ring on properly is the hard part. If you can't do that you may be stuck with a ring you cant' use, so whatever that costs. But you can easily just swap out the whole crank set at that point as you've done no damage to the BB or anything else that wouldn't be replaced with an all new crank set.
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Old 06-19-19, 09:54 AM
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Originally Posted by Skipjacks View Post
Putting the new ring on properly is the hard part. If you can't do that you may be stuck with a ring you cant' use, so whatever that costs. But you can easily just swap out the whole crank set at that point as you've done no damage to the BB or anything else that wouldn't be replaced with an all new crank set.
I've already pondered that possibility If I have to sheepishly take my bike to the LBS without the chainring, I think that I'll say that I found the bike

Thanks for the replies guys!
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Old 06-20-19, 01:42 AM
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My only thought would be that if it's riveted then it may be non-standard in terms of sizing. Chainrings use two or three different bolt circle diameters (BCD) so you have to get one with the correct BCD to replace it with. Once you have drilled it out you then may not be able to use standard chainring bolts to mount the new one. All-in-all I'd be inclined to go with a new chainset. Again, you have to get one that matches the bottom bracket. I would think the most likely fitting would be square taper but if you post a photo someone here will be able to tell you. You'll probably need a special tool to get it off, but tools are always a worthwhile investment.
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Old 06-20-19, 07:51 AM
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If you have the skills to drill out a crankset and replace a non-replaceable chainring, you have the skills to simply replace the crankset with something more appropriate.

And what @jgwilliams said about sizing.
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