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 Post subject: Bottom Bracket problems.
PostPosted: Sun Nov 03, 2013 8:08 pm 
Devout Dirtbag

Joined: Wed Aug 21, 2013 7:27 pm
Posts: 141
Location: lancashire
Does anyone have any ideas about this one? I just bought myself an octolink bottom bracket, 73mm/113mm, all good until I tried to slide my XTR M952 chainset on. The splines on the axle are too wide :facepalm: Can anyone suggest an alternative or will I have to try and find a used one. Also, I need a 73mm but I,ve seen some that say 68 or 73, how does that work? It's for a 94 GT RTS if that helps. Thanks.


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PostPosted: Sun Nov 03, 2013 8:25 pm 
National & North West AEC
National & North West AEC
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Joined: Mon Nov 03, 2008 12:43 am
Posts: 8146
Location: Macclesfield Forest
What you have there is the difference between Octalink Version 1 and Version 2.

The V1 BB has shallower splines and only fits V1 cranksets. This was only used on XTR and a few road cranks.

The V2 type of BB which it sounds like you have, was a later version which is compatible with practically all the other Octalink cranksets out there. Deeper splines you see...
They are still manufactured by Shimano too.

Your only option is to find a V1 specific BB, which will only really be an XTR BB. You'll be very lucky to find a new one but may find a decent used one somewhere though.

The 68 or 73 refers to the frame's BB shell width as measured in mm. Your RTS will most likely have a 73mm shell as was usual with GT bikes.
68mm BB shells are the more common width in general.


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PostPosted: Sun Nov 03, 2013 8:47 pm 
Retro Guru
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Joined: Fri Sep 19, 2008 4:37 pm
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Location: North West
73mm Dura ace V1 bottom brackets can still be found at a fair price :D

WD :D


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PostPosted: Sun Nov 03, 2013 9:09 pm 
Gold Trader / PoTM Winner
Gold Trader / PoTM Winner
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Joined: Mon Aug 08, 2011 2:35 pm
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The 2 middles ones :wink:


G


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PostPosted: Mon Nov 04, 2013 9:25 pm 
Devout Dirtbag

Joined: Wed Aug 21, 2013 7:27 pm
Posts: 141
Location: lancashire
Cheers guys, that's a big help at least I know what I'm looking for now. I better start looking for one :facepalm:


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PostPosted: Mon Nov 04, 2013 9:40 pm 
Retro Guru
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Joined: Fri Sep 19, 2008 4:37 pm
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Location: North West
This thread might help a bit to : viewtopic.php?f=1&t=267607&hilit=bottom

If you want, pm your email and I will send you the 950 bb instalation instructions which show what spacers fit where to suit shell width etc.

Cheers,

WD :D


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PostPosted: Mon Nov 04, 2013 9:44 pm 
retrobike rider
retrobike rider

Joined: Thu Apr 17, 2008 1:24 am
Posts: 7562
Location: Manchester
Ultegra BB-6500 fits and it fairly cheap. I sold a nice one for £15 last week on eBay.


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PostPosted: Tue Nov 05, 2013 3:46 pm 
Retrobike Sponsor
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Joined: Sat May 22, 2010 10:33 pm
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Location: Suffolk
Shimano 5500 and 7700 are available new in 109mm and 118mm lengths. The 6500 were available in the same length. So your chainline will be out.


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