Sugino Messenger cranks + sugino 75 bb compatibility
12-30-09, 08:18 PM
#1
Newbie
Thread Starter
Join Date: Dec 2009
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
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?
12-30-09, 08:32 PM
#2
thread derailleur
Join Date: May 2008
Location: beyond Thunderdome
Posts: 1,095
Bikes: 82 Bianchi ECO Pista, Pake, Kilo TT, some *** bmx i found underneath an old house
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
different tapers and different spindle lengths. if you want your chainline to be straight, no.
12-30-09, 08:53 PM
#3
Your cog is slipping.
But if you want your chainline to be totally wonky, yes.
12-30-09, 09:18 PM
#4
Senior Member
Join Date: Feb 2009
Posts: 658
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
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.
12-30-09, 10:35 PM
#5
Your cog is slipping.
Holy crap!
12-30-09, 11:37 PM
#6
Senior Member
Join Date: Jun 2008
Location: Chicago, IL
Posts: 513
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
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.
12-31-09, 10:02 PM
#7
Junior Member
Join Date: Jul 2009
Posts: 19
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
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.
12-31-09, 11:58 PM
#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.
01-01-10, 07:29 PM
#11
good friends dont
Join Date: Aug 2009
Location: San Diego
Posts: 156
Bikes: Zullo Custom Track
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
01-01-10, 07:51 PM
#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.
01-01-10, 08:10 PM
#13
good friends dont
Join Date: Aug 2009
Location: San Diego
Posts: 156
Bikes: Zullo Custom Track
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
01-01-10, 08:27 PM
#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?
01-01-10, 09:39 PM
#16
Senior Member
Join Date: Jun 2009
Location: wild west
Posts: 73
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
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.
01-01-10, 09:46 PM
#17
Your cog is slipping.
Agreed. Donuts are good. So is coffee. Together, they are awesome. Happy New Year.
