Sugino Messenger cranks + sugino 75 bb compatibility
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Sugino Messenger cranks + sugino 75 bb compatibility
Are these parts compatible? I've heard in some cases that ISO cranks and JIS bb's and vice-versa are compatible. Any know if these two are?
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different tapers and different spindle lengths. if you want your chainline to be straight, no.
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https://www.sheldonbrown.com/bbtaper.html - " if you install a J.I.S. crank on an ISO spindle, it will wind up about 4.5 mm farther in than it would on a J.I.S spindle of the same length."
Since your Messenger crank needs a 103mm JIS BB, and your Sugino BB is a 109mm ISO BB, the extra length and the narrower taper may cancel each other out and leave you with a chainline that's within 1-2mm of perfectly straight.
Unbelievable.
I'd still buy a new 103mm JIS bottom bracket for $25, but you just may be in luck.
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I CANNOT believe this, but they may be.
https://www.sheldonbrown.com/bbtaper.html - " if you install a J.I.S. crank on an ISO spindle, it will wind up about 4.5 mm farther in than it would on a J.I.S spindle of the same length."
Since your Messenger crank needs a 103mm JIS BB, and your Sugino BB is a 109mm ISO BB, the extra length and the narrower taper may cancel each other out and leave you with a chainline that's within 1-2mm of perfectly straight.
Unbelievable.
I'd still buy a new 103mm JIS bottom bracket for $25, but you just may be in luck.
https://www.sheldonbrown.com/bbtaper.html - " if you install a J.I.S. crank on an ISO spindle, it will wind up about 4.5 mm farther in than it would on a J.I.S spindle of the same length."
Since your Messenger crank needs a 103mm JIS BB, and your Sugino BB is a 109mm ISO BB, the extra length and the narrower taper may cancel each other out and leave you with a chainline that's within 1-2mm of perfectly straight.
Unbelievable.
I'd still buy a new 103mm JIS bottom bracket for $25, but you just may be in luck.
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you need to be really careful of jis cranks bottoming out on an iso taper bb since the iso taper is so much narrower. it just depends on the specific cranks involved. you can try it and it MAY work, or it will bottom out and you will round off the taper on the cranks turning them into nice paperweights.
#9
Your cog is slipping.
Most likely to try to correct the chainline issues associated with Sugino RDs.
OP - just use a 103mm JIS BB and you'll end up with a chainline that will be off by only 2 or 3mm (perfectly fine). I put a 1mm cassette spacer beneath the cog when helping a friend with his build and his chainline is pretty damn straight.
OP - just use a 103mm JIS BB and you'll end up with a chainline that will be off by only 2 or 3mm (perfectly fine). I put a 1mm cassette spacer beneath the cog when helping a friend with his build and his chainline is pretty damn straight.
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#12
Your cog is slipping.
Why slap yourself? It's perfectly okay to use a cassette spacer as long as you don't go overboard and try using one that's too thick and eliminating a bunch of threads in the process. My friend's cog + spacer ended being just as thick as my EAI cog.
Last edited by Scrodzilla; 01-01-10 at 08:03 PM.
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#15
Your cog is slipping.
Please explain why an EAI cog and a no name cog + 1mm spacer equaling the same width are so different. Are you afraid of seatpost shims and washers too?
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ok. back on topic. sell the sg75 bb. get the correct one. buy a cup of coffee and a donut. dunk donut in said coffee. eat. repeat. have a merry day. yay.
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