Extremely weird 52t chainring
10-06-14, 09:19 PM
#1
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Extremely weird 52t chainring
Found this while sorting the chainring shelf at our local bike co-op. All of us are stumped. Anyone know what this is?
https://imgur.com/a/kyReV
https://imgur.com/a/kyReV
10-06-14, 09:44 PM
#2
Pedalin' Erry Day
What's the BCD? If it's 144, then I'd bet that's a Dura Ace 10-Pitch ring (custom?).
Last edited by lasauge; 10-07-14 at 01:07 AM.
10-07-14, 01:22 AM
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Just a guess, but could it be a home-brewed triplizer setup where a third chainring is added to the outside of a dual chainring setup, in place of a chain guard, perhaps?
10-07-14, 04:52 AM
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The BCD is way above 144. I'll guess it's somewhere around 185 mm. The holes are so close to the edge I don't believe you could bolt it to a ring any smaller than 52t; 51t or maybe 50t, just barely, but that hardly makes sense. Maybe this was made to be attached to an even larger chain ring, perhaps for a recumbent or other bike with small wheels.
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Last edited by rhm; 10-07-14 at 08:00 AM.
10-07-14, 07:43 AM
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10-07-14, 07:48 AM
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I had a Silstar crank once that had an impossibly large outside BCD (180+), paired with a 118 inner ring BCD. Odd duck. Also had a bashguard. I removed the big ring, left the guard ring and used the inner mount for a single speed.
Similar to this thing (not mine):
Similar to this thing (not mine):
10-07-14, 08:00 AM
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^^That makes sense.
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