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 Post subject: Old 105 33t chainring.
PostPosted: Wed Sep 04, 2013 1:23 pm 
Retro Guru

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Where can I get a 33t chainring for an old 105 crank?I want to put the existing inner 42t on the outside and stick a 33t on the inside,its 5 bolt 130 BCD.


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PostPosted: Wed Sep 04, 2013 1:32 pm 
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smallest you can fit on a 130 bcd is 38 and that's a tight fit, normally its 39

you'd need a modern compact for a 33 I guess


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PostPosted: Wed Sep 04, 2013 1:37 pm 
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pigman wrote:
smallest you can fit on a 130 bcd is 38 and that's a tight fit, normally its 39

you'd need a modern compact for a 33 I guess

AFAIK the smallest available is 33t


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PostPosted: Wed Sep 04, 2013 1:48 pm 
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You are mistaken, Pigman is spot on


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PostPosted: Wed Sep 04, 2013 3:53 pm 
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I stand corrected,whats the smallest outer chainring available for that BCD?


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PostPosted: Wed Sep 04, 2013 5:53 pm 
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66 triumph daytona wrote:
I stand corrected,whats the smallest outer chainring available for that BCD?


38 - they're basically the same.


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PostPosted: Wed Sep 04, 2013 5:54 pm 
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38 is the smallest you can go on 130 bcd.


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PostPosted: Wed Sep 04, 2013 7:13 pm 
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Its currently got a 52/42.Would a 38/42 work?Its for my father-a 52t is too high for him.


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PostPosted: Wed Sep 04, 2013 9:08 pm 
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A 38/42 should work ok, but a difference of only 4t between chainrings is not a lot. You might get better ratios if you change the freewheel or cassette, depending what sprockets you have now.


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PostPosted: Thu Sep 05, 2013 8:35 am 
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personally, I'd get onto the MTB sales section on retrobike and get an old MTB chainset (probably the 4 arm model, as they starting using lower ratios) and ditch the inner ring. So you'll end up with something like 32/42


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