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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 01-23-08, 01:19 PM   #1
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RD2 Messenger & Sugino BB fit problem

Ok, so I got the RD2 messenger cranks and the corresponding Sugino BB 68x103. But the fit looks really weird, so I'm wondering if I'm not installing it correctly or what.

By weird I mean that there does not seem to be enough spindle clearance for the left spindle. With the left err holder ring?, dunno what exactly it's called, threaded on there really isn't any clearance for tightening on the crank with a crank bolt.

I can barely get it to the point I would need a crank puller to remove the crank. And if I tighten beyond that it grinds into the the left holder thing of the bb.

And just as a double check I removed the BB and checked the fit of the crank with the holder thing put on. And the clearance is still the same.

So am I supposed to really torque my wrench and force the holder thing a little further onto the BB? Or is that clearance what I should expect and I'm not supposed to really tighten the crank bolt that much?

Or is something just defective?
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Old 01-23-08, 02:30 PM   #2
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can you get any pictures? I'm not trying to be offensive, but if you don't know the terminology this may just be over your head and you should take it to a bike shop.
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Old 01-23-08, 02:32 PM   #3
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Originally Posted by NeilMonday View Post
I'm not trying to be offensive, but if you don't know the terminology this may just be over your head and you should take it to a bike shop.
+1111111
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Old 01-23-08, 03:18 PM   #4
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No problem. Here's a whole slew of them. At any point there is a picture the crank is pushed on just far enough that it'll be held in from pressure. Though a slight tap is probably enough to make it fall off again.

So this is the crank on the BB with the cup? installed.


And then without


Installed with no cup


Side view of the left side.


Putting the crank on without the cup installed.


This time with the crank


And finally this time with the lockring on and the crank bolt tightened just barely past the point I felt pressure from the bolt pushing the crank onto the spindle. Crank is grinding if I move it at this point. Possible the lockring is too thick?


And I measured my bb shell from opening to opening, it's 68mm.
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Old 01-23-08, 03:37 PM   #5
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you don't need the lockring on the non drive side. Just thread the non drive side cup in until it is snug against the bottom bracket inside the shell. There should not be any protruding threads.
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Old 01-23-08, 03:39 PM   #6
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umm, "left holder thing" = left cup.

the left cup should probably thread onto the cartridge more than it is doing.
if your BB shell measures 68mm then that BB should fit ok.

when you had the left cup on the cartridge in pic #1 is that the furthest it will slide on the cartridge. you should put a little grease on it.
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Old 01-23-08, 03:40 PM   #7
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Warning: I am no professional but here's what I think. It looks like your left (non-drive side) cup is not installed far enough in. Also I thought with a cartridge bb you don't need a lockring. When you tighten the left cup, the bb is lined up and is sliding into the cup as you tighten it right?
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Old 01-23-08, 03:46 PM   #8
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right.
there is no lockring. the left side cup should be tightened all the way until you feel it press the cartridge into the right side cup. that will hold the cartidge in there. then tighten that left cup real tight and you should have space to put your crank arm on. remember to put some grease in the cups and on the threads...
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Old 01-23-08, 04:21 PM   #9
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Ah, cool. Greased the inside of the cup a little and cranked a little harder. That did the trick.
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