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PostPosted: Tue Jul 16, 2013 10:35 pm 
Gold Trader / PoTM Winner / RB Rider
Gold Trader / PoTM Winner / RB Rider
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Joined: Tue Feb 26, 2013 6:26 pm
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Location: 54 Festive Road Winchcombe GLOUCS Yarp...
Ok so I'm a wuss climbing on a road bike. How small a ring can I put on my biopace 130 BCD inner ring? I see 39T on eBay. Is that it?

Currently 52/42 and not loving it. Obviously should I become a mountain goat I can swap back but r now need some granny action!

So 39 or....?

Thanks as always. Learning as I go.


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PostPosted: Tue Jul 16, 2013 11:37 pm 
Old School Grand Master
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Joined: Thu Jul 19, 2007 7:18 pm
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Location: Staffordshire
I have a 130 BCD 38 tooth on my 600 cranks. Seems to work fine with the braze on front mech. I got it from eBay.


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PostPosted: Wed Jul 17, 2013 6:31 am 
rBoTM Winner
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Joined: Wed Dec 12, 2012 10:18 pm
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Location: California
The difference between 39 t and 38 t is small as far as gear inches (aka effort) is concerned. Best bet is to find a freewheel or cassette that has a 27 or 28 t cog. that will make the hills easier...


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PostPosted: Wed Jul 17, 2013 6:58 am 
retrobike rider
retrobike rider
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Joined: Fri Aug 08, 2008 2:36 pm
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Location: Yorkshire, England
38 according to here
sheldonbrown.com/cribsheet-bcd.html

No doubt some oddball in the bolts 37 is available :lol:

Other solutions are fit a triple or compact double.
Or bigger cogs at the back.


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PostPosted: Wed Jul 17, 2013 7:14 am 
Retro Guru
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Joined: Sat Apr 02, 2011 11:16 am
Posts: 799
Location: Camden, London
I've a stronglight '99 double on one of mine, all rings same 86 bcd, I run 48-36 for those hillier moments with a more standard block


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PostPosted: Wed Jul 17, 2013 8:23 am 
Gold Trader / PoTM Winner / RB Rider
Gold Trader / PoTM Winner / RB Rider
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Joined: Tue Feb 26, 2013 6:26 pm
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Location: 54 Festive Road Winchcombe GLOUCS Yarp...
Don't want to faff around with rear as don't have the tools as yet. So would changing 42 to 39 make an appreciable difference?


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PostPosted: Wed Jul 17, 2013 8:28 am 
Gold Trader / PoTM Winner / RB Rider
Gold Trader / PoTM Winner / RB Rider
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Joined: Tue Feb 26, 2013 6:26 pm
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Location: 54 Festive Road Winchcombe GLOUCS Yarp...
Unless? Is this our johnny boy?
http://www.ebay.co.uk/itm/171074243565? ... 1438.l2649


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PostPosted: Wed Jul 17, 2013 12:03 pm 
rider | rBoTM Winner
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Joined: Fri Jan 25, 2008 1:42 pm
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Location: Wakefield, Yorkshire
The History Man wrote:
Don't want to faff around with rear as don't have the tools as yet. So would changing 42 to 39 make an appreciable difference?

I reckon so. Using a 38 even more so. I can tell the difference.


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PostPosted: Wed Jul 17, 2013 1:20 pm 
Retro Guru
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Joined: Mon Mar 02, 2009 4:22 pm
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48 to a 46 on my fixed gear makes a noticeable difference, so I'd say you will notice 42 to 39.

But I think I agree some granny gears on the back are probably more what you're looking for.


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PostPosted: Wed Jul 17, 2013 1:32 pm 
Gold Trader / PoTM Winner / RB Rider
Gold Trader / PoTM Winner / RB Rider
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Joined: Tue Feb 26, 2013 6:26 pm
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Location: 54 Festive Road Winchcombe GLOUCS Yarp...
Thanks. Looking for the quick simple fix if you'll forgive the pun. Apparently should change the biopace upfront anyway at some point so was going to kill two birds etc.

What About this as a swap? http://www.ebay.co.uk/itm/171074243565? ... 1438.l2649 and what should I pay for something? So hard to know given all the model numbers etc.


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