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Chain ring and crank adapter - identify?

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Chain ring and crank adapter - identify?

Old 01-13-21, 04:01 PM
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Stevensb 
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Chain ring and crank adapter - identify?

I have this adapter which has no markings of any sort on it and would like to know more about it's use.

The 3 inner holes are 100mm apart measured centre to centre. The 5 outer holes are 75mm apart CTC.

The outer 5 holes match up perfectly with a 52 tooth TA chain ring I have. I presume the 3 inners are for cranks? If so, what kind?

Thanks.

Brad
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Last edited by Stevensb; 01-13-21 at 04:05 PM. Reason: incomplete
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Old 01-13-21, 04:12 PM
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My guess would be that the holes are actually 100.4mm apart, which would make it a 116 BCD ring, the standard for many European 3-arm steel cranks, as well as the TA Professionel.
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Old 01-13-21, 04:52 PM
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The top is a TA adapteur for 116 crankset. Could be single or double I suppose?
TA logo on bottom chainring

Last edited by clubman; 01-13-21 at 04:57 PM.
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Old 01-13-21, 05:13 PM
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Thanks non-fixie and clubman .

I guess I'll need to start looking for TA professional, or similar 116 bcd, cranks, bolts, etc.

Cheers.

Brad
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Old 01-13-21, 06:15 PM
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I have a couple of NOS 6 bolt chainrings in the 48-51 range if you ever want to go with the adapteur. The smaller rings are hard to find at a good price.
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