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PostPosted: Sat Mar 23, 2013 4:53 pm 
retrobike rider / Gold Trader
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Joined: Sat Jun 20, 2009 3:45 pm
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Location: Birmingham
right my middleburns require a 113 axle, but i have spotted a nice un91 road bb with a 115mm axle thing.

would this work 2mm seems so teeny tiny, but then i also hear of people using 107mm with middleburns

any thoughts


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PostPosted: Sat Mar 23, 2013 4:57 pm 
retrobike rider / Gold Trader
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oh goodness im a feckwit, can a good mod please move this so that i can be enlightened please :( :( :(


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PostPosted: Sat Mar 23, 2013 5:54 pm 
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Location: It's not easy being a dolphin.
I use 68/107mm. I think a 73/107 would be pushing it and the cups would hit the crank.

107 and 113 are symmetrical, but I don't know if the 115mm is. 110mm is asymmetric and therefore not suitable unless you use a 1.5mm spacer on the DS.


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PostPosted: Sat Mar 23, 2013 5:56 pm 
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2 mm should not make a huge difference if your chain line is 47.5 -50 mm now pushing it to 51 mm should not create mega indexing or chainline disasters.


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PostPosted: Sat Mar 23, 2013 5:59 pm 
retrobike rider
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RS3's use 107mm axles, I seem to recall that RS7's use a longer axle, 113mm is probably right.

I fancy you could get away with 115mm, as it's only a mm either side and Shimano chain line is usually around as 47.5 to 50 mm.


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PostPosted: Sat Mar 23, 2013 6:51 pm 
retrobike rider
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115 is all on the non-drive side compared to 113 iirc.
Its an old road (and suntour MD) spec


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PostPosted: Sat Mar 23, 2013 6:54 pm 
retrobike rider / Gold Trader
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Its this folks.

I do have a new un 55 in the correct length.

http://www.ebay.co.uk/itm/Shimano-UN91- ... 1c313c0002

So will it work.


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PostPosted: Sat Mar 23, 2013 8:12 pm 
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Location: It's not easy being a dolphin.
The 115 will put the cranks off-center which you may not be fussed about....it will go round though :wink:


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