Something special about inner chainring bolts?
08-27-09, 07:23 AM
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Something special about inner chainring bolts?
Is it okay to just use just the male half of a normal chainring bolt (the kind you'd use for a double) to affix the third chainring on a triple? It would seem to be okay unless there's something about it I don't know. I've got a ton of the one kind of bolt and none of the other, so I'm not eager to go buy the special inner bolts unless I need to, especially since the seem to cost something like $12-15 for five of 'em.
08-27-09, 10:09 AM
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I'm trying really hard to think of a reason not to do that. About all I can come up with is that they're a bit shorter.....
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08-27-09, 11:03 AM
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The inner ring uses longer threaded male versions than the doubles.
Not sure why though, seems like the typical double versions should work fine.
TP
Not sure why though, seems like the typical double versions should work fine.
TP
08-27-09, 05:43 PM
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I can't think of any reason to not use them, but I'll deny all blame when your crankset explodes and the chainring shoots out and kills bystanders.
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08-29-09, 06:55 AM
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Hello don't the inner bolts have a 'shoulder' for the chainring to ride on?
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08-29-09, 10:56 AM
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I know I'm replying to my own question here, but the type of crankset used might be a factor. I suspect that it will never be a problem if you're using a crank where the ring is spaced with pillars that are an integral part of the crankset. But if it's the old style where there are little tubular aluminum spacers between the ring and the crankset to space it properly, maybe you use up enough bolt just passing through the ring and spacer that you don't have quite enough to thread into the crank (since as we've noted the two-piece bolts are shorter). In that case I guess it could be a problem. Judgement call, I guess, depending on the thickness of ring and spacers and the length of the bolt. Maybe the question should be "what's the minimum amount of threading into the crankset that can be considered adequate to hold on the inner chainring?" Which one would calculate by measuring the threaded portion of the bolt and subtracting the thickness of the chainring and spacers, if any.
08-31-09, 09:15 AM
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)) <> ((
I know I'm replying to my own question here, but the type of crankset used might be a factor. I suspect that it will never be a problem if you're using a crank where the ring is spaced with pillars that are an integral part of the crankset. But if it's the old style where there are little tubular aluminum spacers between the ring and the crankset to space it properly, maybe you use up enough bolt just passing through the ring and spacer that you don't have quite enough to thread into the crank (since as we've noted the two-piece bolts are shorter). In that case I guess it could be a problem. Judgement call, I guess, depending on the thickness of ring and spacers and the length of the bolt. Maybe the question should be "what's the minimum amount of threading into the crankset that can be considered adequate to hold on the inner chainring?" Which one would calculate by measuring the threaded portion of the bolt and subtracting the thickness of the chainring and spacers, if any.
your calculations are exactly what i did. if you aren't in a hurry or don't feel comfortable, there's always www.loosescrews.com.
