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Old 05-03-10, 10:24 AM   #1
Mauriceloridans
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Bmx chainring on sugino crankset

I have a 110/74 Sugino triple crankset on my touring bike (83 Trek 520). I want to move my middle 45t ring to the outer posistion (I tried it, it works) and need to buy a 37t for the new middle. Can I use a bmx chainring? they are cheaper and widely available than sugino rings. I'm puzzled why many online vendors don't list the bmx rings with the other ones. Are they thicker or somehow only workable as a single ring?
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Old 05-03-10, 11:38 AM   #2
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Why not as long as it's 3/32" and matching bcd?
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Old 05-03-10, 06:16 PM   #3
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Some BMX rings are designed for 1/8" chain and will not work with 3/32" chain used on derailleur bikes.
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Old 05-03-10, 08:00 PM   #4
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I was looking at Sinz which said it would work with both 1/8 and 3/32 chain. I chickened out and ordered a Sugino for $10 more. My definitive answer did not arrive. I know the bcd and 5 bolt pattern should have worked but BMX are not made for shifting so I couldn't risk it. Thanks
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Old 05-04-10, 05:46 AM   #5
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Are the Sugino rings ramped/pinned? Rings haven't always had such...
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Old 05-04-10, 08:18 AM   #6
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Quote:
Originally Posted by Mauriceloridans View Post
I was looking at Sinz which said it would work with both 1/8 and 3/32 chain. I chickened out and ordered a Sugino for $10 more. My definitive answer did not arrive. I know the bcd and 5 bolt pattern should have worked but BMX are not made for shifting so I couldn't risk it. Thanks
What does "designed for shifting" mean? If it's referring to ramps and pins and such, be aware that these are recent innovations and derailleurs were used for the better part of a century without specifically designed chainrings.
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Old 05-04-10, 09:18 AM   #7
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Both right. Sugino not ramped and pinned. Nor are my vintage chainrings. I'm usually more daring when it comes to saving some bucks and I did research it. I hope someone will come along and say "yes, I've done it, no problem" so the thread will be a resource to someone in similar circumstances.
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Old 05-04-10, 11:00 AM   #8
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It's just a chainring...it's like many things bicycle, where marketing has you thinking it's something unique when it's not.
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Old 05-04-10, 01:57 PM   #9
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Some BMX chainrings will not only not be ramped and pined, but will also have very tall teeth to avoid chain fall. This is a good thing on a BMX bike, not so much when you want to shift.
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Old 05-04-10, 02:49 PM   #10
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Don't bother worrying about pinned and ramped chainrings.
I got a 110/74bcd SR Sakae triple with: 48t Biopace outer, 36t Blackspire middle made for single speeds, unramped dinossaur 24t inner chainring. Shifts just fine, although it takes 1/20sec longer to shift: enough for Cavendish to lose the final sprint, but not a problem for you/me.
I like the sound of the chain when it hits the fat middle ring: just a nice solid ka-tchunk and I know it shifted well and chain drops are no problem. I feel so married.
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Old 05-04-10, 02:50 PM   #11
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fuzz2050, I didn't know they could have different tooth profiles...but why would they be ramped and pinned?
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Old 06-12-10, 08:47 PM   #12
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Good discussion here, as I've just been wondering exactly the same thing. More to the point, I like the idea of the dual-pattern BMX rings since they'd fit both my 110mm crank and my 130mm. My '85-vintage Sakae alloy rings from a half-step touring triple have no ramps or pins at all, and they shift great in their original configuration, so it makes sense that a singlespeed ring should work fine also so long as the chain fits and the derailer can be made happy with the ring size.

Interesting about the Biopace big ring with round middle ring; Sheldon Brown observed that such a combination made no sense, though based on his comments about Biopace being more comfortable at lower RPM, I'd think it would work extremely well.

Oddly, of the rings I've been experimenting with lately, my 39t from a Sora double (no ramps) works beautifully in the middle position on a triple, while my 36t Accushift middle ring prefers to suck and chatter.
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