Sugino Messenger chainring bolts?
07-18-13, 08:18 AM
#1
Senior Member
Thread Starter
Join Date: Jan 2006
Location: Toledo, OH
Posts: 483
Bikes: Leader 722TS, Surly Steamroller, Panasonic DX-3000, Trek 4900
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Sugino Messenger chainring bolts?
Anyone know what the torque specs are for the Sugino Messenger crankset? I have a Park Tool torque guide but I'm not sure whether the bolts are steel or aluminum.
UPDATE
Looks like these are the bolts that came with my crankset. It lists the nut as steel and the bolt as duralumin. Not sure whether that means I should go by the steel torque specs or the aluminum. I'm assuming aluminum to play it safe.
UPDATE 2
Torqued to 70 inch lbs and didn't damage the bolts. Gonna keep it there for now.
UPDATE
Looks like these are the bolts that came with my crankset. It lists the nut as steel and the bolt as duralumin. Not sure whether that means I should go by the steel torque specs or the aluminum. I'm assuming aluminum to play it safe.
UPDATE 2
Torqued to 70 inch lbs and didn't damage the bolts. Gonna keep it there for now.
Last edited by smurray; 07-18-13 at 02:09 PM.
07-18-13, 10:42 AM
#3
Your cog is slipping.
Seriously. You're only going to be able to tighten them so much holding the backs in place with a chainring bolt spanner tool anyway.
07-18-13, 11:52 AM
#5
Fixie Infamous
Join Date: Dec 2011
Location: SF
Posts: 10,474
Bikes: 2007 CAAD Optimo Track, 2012 Cannondale CAAD10, 1996 GT Force restomod, 2015 Cannondale CAADX
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 54 Post(s)
Likes: 0
Liked 4 Times
in
4 Posts
When in doubt, Rockwell hardness test (or a magnet).
Wait... why didnt that guy hella long ago with the ****ty mtb just use a magnet? what a dick.
Wait... why didnt that guy hella long ago with the ****ty mtb just use a magnet? what a dick.
07-18-13, 12:08 PM
#6
Your cog is slipping.
His magnets were all being stored in a time capsule for later use.
07-18-13, 12:32 PM
#7
pro in someone's theory
Join Date: Jul 2011
Location: Las Cruces, NM
Posts: 3,236
Bikes: FTP
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 72 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
You just summarized that whole thread.
07-22-13, 06:26 PM
#8
Newbie
Join Date: Jul 2013
Location: Canada
Posts: 4
Bikes: Custom fixed gear CCM, custom Le Circuit, custom Leader 725
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
The way to tell if the bolts are steel or aluminum is by putting something magnetic to it. If the bolt is magnetic, it is steel and if it is not, then it is aluminum. The torque for a steel crank bolt is 9 to 11 nM. No idea what torque aluminum bolts are. 
07-22-13, 06:43 PM
#9
Veteran Racer
Join Date: Jul 2009
Location: Ciudad de Vacas, Tejas
Posts: 11,757
Bikes: 32 frames + 80 wheels
Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 1331 Post(s)
Liked 763 Times
in
431 Posts
...or stainless steel...or titanium are also non-magnetic. Anyways, I hate using aluminum for any bolts or screws. Even if the threads don't strip out, then the hex sockets will and the only ones that are reliable use a Torx key to tighten them. The weight savings are negligible.
07-22-13, 09:01 PM
#10
Fixie Infamous
Join Date: Dec 2011
Location: SF
Posts: 10,474
Bikes: 2007 CAAD Optimo Track, 2012 Cannondale CAAD10, 1996 GT Force restomod, 2015 Cannondale CAADX
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 54 Post(s)
Likes: 0
Liked 4 Times
in
4 Posts
Pedantic metal guy to the rescue.
07-23-13, 02:03 PM
#11
Banned.
Join Date: Sep 2009
Location: Winnipeg
Posts: 2,975
Bikes: Fiori Fixie powder blue w/ granny bars
Mentioned: 89 Post(s)
Tagged: 0 Thread(s)
Quoted: 6495 Post(s)
Likes: 0
Liked 29 Times
in
28 Posts
...or stainless steel...or titanium are also non-magnetic. Anyways, I hate using aluminum for any bolts or screws. Even if the threads don't strip out, then the hex sockets will and the only ones that are reliable use a Torx key to tighten them. The weight savings are negligible.
Thread
Thread Starter
Forum
Replies
Last Post
sinikl
Singlespeed & Fixed Gear
4
12-08-12 12:31 PM
RiverHills
Bicycle Mechanics
54
09-12-10 11:10 PM
