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PostPosted: Wed Mar 13, 2013 10:15 pm 
retrobike rider
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Joined: Fri Aug 08, 2008 2:36 pm
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Location: Yorkshire, England
cce wrote:
in retroland the 50mm is (mainly) for fatter seat tubes.

since nowadays almost everything has a fatter seat tube, 50mm has become the standard


Is that because of fatter tubes or because Shimano wanted to make things cheaper (by making just one version, I don't blame them)
So bottom brackets would be 73mm (and shimmed to fit for smaller sizes and meaning the wider chainline is often preferred for cup clearance)
Same for the front mech use the wider one and shim it down (meaning the 50mm chainline is again prefered for shifting alignment)

Also the move to 9 speed probably means the 50mm is slightly better (never actually looked to see if it is ?)

All in all a much better business production model and customer model. :)


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PostPosted: Wed Mar 13, 2013 10:22 pm 
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Joined: Sun Jul 19, 2009 7:14 pm
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Location: Staffordshire
I have no idea at all now when it comes to this , just wish there was a chart to show what's what based on the bike and the kit you are running .


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PostPosted: Wed Mar 13, 2013 10:58 pm 
retrobike rider
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Antfox wrote:
I have no idea at all now when it comes to this , just wish there was a chart to show what's what based on the bike and the kit you are running .

Cheaper (well much easier) just to have a 107 and 122 bottom bracket in (with a few in the middle if you want, like 118). Get them from old bike or next to nowt on CRC in the sale.
Fit and try, then work it out.


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PostPosted: Wed Mar 13, 2013 11:20 pm 
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Joined: Sun Jul 19, 2009 7:14 pm
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Location: Staffordshire
That's a good idea matey , I have not yet decided on a set of cranks so that's going to be a major factor on the seize :(


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PostPosted: Thu Mar 14, 2013 11:09 am 
retrobike rider / Gold Trader
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Joined: Fri May 08, 2009 10:01 am
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Location: Stockport, staring at the Peaks
Rob Atkin wrote:
Sheldon wasn't always right either.....


Burn the blasphemer! :evil:


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PostPosted: Thu Mar 14, 2013 11:59 am 
retrobike rider / Gold Trader
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Joined: Sun Jan 24, 2010 12:48 am
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Location: Cheshire
And you have all been trumped by this:
http://www.bikepro.com/products/bottom_ ... able.shtml


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PostPosted: Thu Mar 14, 2013 2:20 pm 
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Location: The Cave of Shame
Rick Draper wrote:
And you have all been trumped by this:
http://www.bikepro.com/products/bottom_ ... able.shtml


Unless you have Middleburn cranks for example..... :P

(ps 107mm for RS3's and 122 for RS2's)


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PostPosted: Thu Mar 14, 2013 6:57 pm 
retrobike rider / Gold Trader
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Location: Cheshire
secret_squirrel wrote:
Rick Draper wrote:
And you have all been trumped by this:
http://www.bikepro.com/products/bottom_ ... able.shtml


Unless you have Middleburn cranks for example..... :P

(ps 107mm for RS3's and 122 for RS2's)


Middleburn smiddleburn :lol:


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