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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 04-15-18, 12:57 AM   #1
*Scuba
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Any cup and cone 68 x 103 mm bottom brackets?

Hi all,

Just wondering if anyone knows of a manufacturer that still makes cup and cone bottom bracket with a 103 mm square taper spindle. Or where to source a 103 mm JIS spindle.

I have two bikes that uses 68 x 103 JIS bottom brackets. One has Sugino Messenger cranks and the other has Sugino Mighty comp. Both currently have sealed cartridge bottom brackets and are perfectly fine. I think one is an IRD and can't remember what the other one has (maybe Tange).

The reason I am curious about using loose ball bearings instead of sealed cartridge bearing bottom bracket is that I like to service my own bikes on a regular basis and just find it meditative to repack a bottom bracket and then fine tune the adjustment. Just something that I enjoy I guess. Plus I volunteer at my local bike co-op and have access to their tools and stand so it costs me next to nothing to service a bottom bracket on a regular interval.

Thanks in advance!
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Old 04-15-18, 01:37 AM   #2
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Originally Posted by *Scuba View Post
Hi all,

Just wondering if anyone knows of a manufacturer that still makes cup and cone bottom bracket with a 103 mm square taper spindle. Or where to source a 103 mm JIS spindle.

I have two bikes that uses 68 x 103 JIS bottom brackets. One has Sugino Messenger cranks and the other has Sugino Mighty comp. Both currently have sealed cartridge bottom brackets and are perfectly fine. I think one is an IRD and can't remember what the other one has (maybe Tange).

The reason I am curious about using loose ball bearings instead of sealed cartridge bearing bottom bracket is that I like to service my own bikes on a regular basis and just find it meditative to repack a bottom bracket and then fine tune the adjustment. Just something that I enjoy I guess. Plus I volunteer at my local bike co-op and have access to their tools and stand so it costs me next to nothing to service a bottom bracket on a regular interval.

Thanks in advance!

I'm guessing no, because your cranks actually project into the width of the cups, and can do that because of the way cartridge BBs are inset into their cups. The flat outer cups on an adjustable would be grinding against the crank once you tightened the crank bolts down.

I have a DA crank that uses a 103 and it would drag the cups even with a 108 spindle and loose ball BB.
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Old 04-15-18, 12:04 PM   #3
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I'm guessing no, because your cranks actually project into the width of the cups, and can do that because of the way cartridge BBs are inset into their cups. The flat outer cups on an adjustable would be grinding against the crank once you tightened the crank bolts down.

I have a DA crank that uses a 103 and it would drag the cups even with a 108 spindle and loose ball BB.
Hi Kontact,

Thanks for the advice, totally had a "Do'h" moment. I ride my main commuter in all weather, so I wipe it down regularly. I stare at that bottom bracket and cranks all the time, in detail. How could I have forgotten. But, I just had to double check and you are totally correct.

The back of the cranks do protrude into the bottom bracket shell, so a cup and cone BB won't work.

Now, I guess I am going to have to find a vintage crankset and a matching cup and cone BB!
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Old 04-15-18, 07:37 PM   #4
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Each to his own. I'm loving the fact that I haven't had to touch any of my cartridge bottom brackets since I installed them. Frees up more time for riding or... anything else.
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Old 04-16-18, 10:28 AM   #5
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Each to his own. I'm loving the fact that I haven't had to touch any of my cartridge bottom brackets since I installed them. Frees up more time for riding or... anything else.
+1

I would just get a high quality sealed bearing BB and never worry. Or upgrade your cranks to Sugino 75 and they make a BB you can adjust and clean and futz with till your hearts content or again just go with a sealed bearing which they now make (or get one from Phil Wood) or go Direct Drive and get any number of 24mm BBs including real expensive stuff from CeramicSpeed which will make you 1.2 gigawatts faster according to tests.
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Old 04-16-18, 01:16 PM   #6
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Old 04-16-18, 10:26 PM   #7
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Canucks are crazy.
Hey there friend, what's all this aboot us being crazy, Eh? Look here buddy I will take all your loonies and pop you one in the poutine hole if you don't stop attacking Canada, eh. We are a proud maple syrup and hockey loving people and we don't need you attacking us, guy!
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Old 04-17-18, 03:43 AM   #8
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