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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 05-16-08, 05:31 PM   #1
brooklyn_bike
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Sugino 75 crank arm clearance issue?

anyone else who has installed a Sugino 75 crank and BB have really tight clearance between the left crank arm and BB? the left crank arm has maybe a 2 - 3 mm gap before the BB cup. its not impeding the rotation though. did i over torque my cranks or nothing to worry about?


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Old 05-16-08, 05:53 PM   #2
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Is this Sugino75 crank new or used one?
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Old 05-16-08, 05:59 PM   #3
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brand spankin new from Ben's
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Old 05-16-08, 06:05 PM   #4
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That looks like lots of space to me but i'll let a 75 owner say whether it's normal. I usually use a torque wrench to install cranks but then again I'm a serious noob mechanic.
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Old 05-16-08, 06:14 PM   #5
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You must measure the side of a right and left crank (side of pedal hole) from the center of the frame.
The plus or minus 1mm is a proper size from the center of the frame to the center of chainring by 42mm.
(This is NJS standard formula)

It is not abnormal if the error margin of a right and left size is within 2mm.
Because it is a translation of PC, my English is not accurate. However, you will understand the meaning.

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Old 05-16-08, 06:27 PM   #6
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don't worry about it.
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Old 05-16-08, 06:39 PM   #7
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nice.
enjoy that RB-1. If I had one I'd run it geared - but I'd put a modern drive train on it.

Everyone I've known who has owned one has loved it.
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Old 05-16-08, 06:46 PM   #8
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nice.
enjoy that RB-1. If I had one I'd run it geared - but I'd put a modern drive train on it.

Everyone I've known who has owned one has loved it.
yeah i kept everything to run it geared if i ever want to go back. but it gets more riding time this way. i freekin love the way this bike rides...
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Old 05-16-08, 06:48 PM   #9
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sweet, good call. don't let anybody give you crap for running it fixed, either. hell of a rad ****ing conversion.
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Old 05-17-08, 02:19 PM   #10
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That looks like lots of space to me but i'll let a 75 owner say whether it's normal. I usually use a torque wrench to install cranks but then again I'm a serious noob mechanic.
anyone else who's installed a Sugino 75 crank and BB have really tight clearance between the left crank arm and BB?
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Old 05-17-08, 02:36 PM   #11
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on my FTP the there is LITTLE space between the cranks and the cups of the BB spindle.... i have a SG 75 bb as well.
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Old 05-17-08, 02:40 PM   #12
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That's what the clearance looks like on with my RD2s and IRD 103mm BB, and they work quite well. I wouldn't sweat it if the chainline is good and it isn't creating friction.

Also, RB-1's are the ****. I love them.
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Old 05-17-08, 05:53 PM   #13
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That's what the clearance looks like on with my RD2s and IRD 103mm BB, and they work quite well. I wouldn't sweat it if the chainline is good and it isn't creating friction.

Also, RB-1's are the ****. I love them.
thanks - looks like everythings good then. just did some laps around prospect park and its pure smooth as hell.
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Old 05-17-08, 06:24 PM   #14
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I have 75s on an old DA BB and the left side is marginally closer than the right. It looks fine in the pics to me, but are there any chainline issues you've noticed? If not, you're good!
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Old 05-17-08, 06:52 PM   #15
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1 - Clearance is just that. Clearance. Doesn't matter if it's an inch or a foot.
2 - I sincerly doubt you could over torque the cranks and push them to far down the spindle. They'd split before that happened.

Ride it like you stole it.
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