Free double + triple Biopace chanirings
Printed From: BHPC Forum
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Forum Name: For Sale
Forum Description: Something to sell or give away? Advertise it here
URL: https://forum.bhpc.org.uk/forum_posts.asp?TID=7828
Printed Date: 27 March 2026 at 4:33am
Software Version: Web Wiz Forums 12.07 - https://www.webwizforums.com
Topic: Free double + triple Biopace chanirings
Posted By: melle
Subject: Free double + triple Biopace chanirings
Date Posted: 24 August 2025 at 3:49pm
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I know Biopace chainrings have their fans, but I'm not one of them... I have a 52/42 double and a 48/38/28 triple set, both 5x130+74 BCD, that may be useful to someone. The middle ring of the triple is quite worn, and it looks like the bike it came off had a bit of a front derailleur issue... That said, I'll send them to you completely free of charge. EDIT: silver 42T now spoken for.  
------------- Optima Stinger | 2x Baron |
Replies:
Posted By: LWaB
Date Posted: 24 August 2025 at 10:28pm
| The two larger triple rings (48t, 38t) are 110mm BCD, not 130mm BCD like the double rings (52t, 42t). |
Posted By: melle
Date Posted: 25 August 2025 at 9:06am
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Bloody hell, sharp! I hadn't checked... Are all Shimano triples 110? ------------- Optima Stinger | 2x Baron |
Posted By: LWaB
Date Posted: 25 August 2025 at 9:24am
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No. Their compact MTB triples are smaller than 110mm BCD and Shimano did road triples with 130 + a couple of different granny BCDs. https://sheldonbrown.com/cribsheet-bcd.html" rel="nofollow - https://sheldonbrown.com/cribsheet-bcd.html might help.
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Posted By: melle
Date Posted: 25 August 2025 at 12:41pm
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It's pretty confusing, innit... Thank god for the late Sheldon! ------------- Optima Stinger | 2x Baron |
Posted By: melle
Date Posted: 04 September 2025 at 4:21pm
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Triple set now gone, just the 5T 130BCD chainring left. ------------- Optima Stinger | 2x Baron |
Posted By: nils
Date Posted: 12 September 2025 at 11:33am
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Do you still ahve the two chain rings? would you ship internationally tofrance? best Regards Daniel ------------- CU nils |
Posted By: melle
Date Posted: 12 September 2025 at 11:38am
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I only have the 52T 130BCD one left. As there was little interest here,
I've stuck it https://www.ebay.co.uk/itm/226952487446" rel="nofollow - on eBay . I'll accept a £1 offer and can post it to you
through their shipping programme if that's OK. ------------- Optima Stinger | 2x Baron |
Posted By: melle
Date Posted: 17 September 2025 at 8:06am
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All gone now. ------------- Optima Stinger | 2x Baron |