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One Nut

Old 10-15-21, 10:00 AM
  #1  
UnCruel 
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One Nut

I was looking over one of my bikes, with the intention of identifying the minimum tools required to service the thing in the field. It turns out I can do anything that needs to be done with four sizes of allen/hex keys and a #2 phillips, except there is one (9mm?) nut used to hold the cable on the rear derailleur. What's up with that?
Anyway, does anyone know where I could get a cap nut made to be turned with an allen key wrench?
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Old 10-15-21, 10:13 AM
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Moe Zhoost
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I encounter 9mm hex head nuts and screws frequently in the many bikes I repair. A 8-9-10 tri-wrench is relatively easy to carry. I reckon you can replace the hex head with an allen if you feel strongly about it, but I have to ask how many times will you mess with the cable anchor in the field? Do you carry an extra shift cable and cutters in the case that the cable breaks? In any case, there are many online and storefront fastener outfits that could help you. Make sure you spec the threading and diameter correctly.

Good luck to you and kudos for carrying tools. Many cyclists carry nothing.
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Old 10-15-21, 10:18 AM
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Instead of hunting down a cap nut, I'd spend $12 on one of these:


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Old 10-15-21, 10:24 AM
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A lot of older derailleurs used hex head bolts or hex nuts for their cable clamps. It's not unusual.
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Old 10-15-21, 10:35 AM
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Originally Posted by Moe Zhoost View Post
how many times will you mess with the cable anchor in the field?
Never so far. However, I can't help thinking back to owning cheap bikes where that part slipped.

Originally Posted by Moe Zhoost View Post
Good luck to you and kudos for carrying tools. Many cyclists carry nothing.
Yeah, I don't get that.
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Old 10-15-21, 10:49 AM
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The other place 9mm nuts show up is on Mafac brakes. The cable clamps at the straddle cable. Both nut and bolt head. I've used crescent wrenches more than once or twice to hold the screw. I make sure I have a 9mm open/box wrench handy. (I've seen kits skip that size.)
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Old 10-15-21, 11:07 AM
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4" Titanium Crescent Wrench - yes really.... That'll fit all your bike needs and 26g ( <1oz)

Barry
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Old 10-15-21, 01:50 PM
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It might be easier to replace the derailleur with one that has a common 5 mm Allen pinch bolt. But yeah, I wouldn't worry about field adjustment there. Unless you carry a spare cable and are touring extensively in undeveloped areas.
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Old 10-15-21, 03:57 PM
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Originally Posted by Barry2 View Post
4" Titanium Crescent Wrench - yes really.... That'll fit all your bike needs and 26g ( <1oz)

Barry
Good heavens. Grade 4 Ti is close to pure (unalloyed) Ti and as such is soft (but strong). The sellers claim to sell these to Explosive Ordnance Disposal folks. If my life depended upon a non-magnetic tool, ok. But use that thing on a bike (hardened steel bolts and nuts) about 5 times and your wrench may be toast. Ti is one of the worst (not the worst, I guess Manchego cheese wouold be worst) materials for a wrench. P. T. Barnum was right!
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Old 10-15-21, 05:56 PM
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Originally Posted by WizardOfBoz View Post
Good heavens. Grade 4 Ti is close to pure (unalloyed) Ti and as such is soft (but strong). The sellers claim to sell these to Explosive Ordnance Disposal folks. If my life depended upon a non-magnetic tool, ok. But use that thing on a bike (hardened steel bolts and nuts) about 5 times and your wrench may be toast. Ti is one of the worst (not the worst, I guess Manchego cheese wouold be worst) materials for a wrench. P. T. Barnum was right!
But it's cheaper than the Beryllium copper alternatives.
Some jobs you just have to have them.

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Old 10-16-21, 11:03 AM
  #11  
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Originally Posted by Barry2 View Post
But it's cheaper than the Beryllium copper alternatives.
Some jobs you just have to have them.
Barry
Thankfully I've never had to defuse live ordnance. I did work for the gas company one summer, and if a fitting leaked it probably made good sense to use a non-sparking wrench. But they had union guys that, like, actually knew what they were doing for that.

If my comparisons of Rockwell B and C are good, the Ti is harder than BeCu. Can that be right?
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Old 10-16-21, 11:05 AM
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Anyone else open this thread, expecting it to be about Lance?
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Old 10-16-21, 12:58 PM
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Originally Posted by Shimagnolo View Post
Anyone else open this thread, expecting it to be about Lance?
Oy. I had a friend in grade school with the same one nut problem. We called him "Uno", as I recall. Cruelty of youth..
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Old 10-18-21, 05:03 PM
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Well, I've picked this up for now. It weighs 15.21 grams.

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Old 10-18-21, 11:26 PM
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Have you tried those hex nuts they have on some cantilever or V brakes, to hold the pads on if I remember correctly?
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Old 10-19-21, 10:04 AM
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Who is Lance Armstrong?
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Old 10-19-21, 10:20 AM
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Originally Posted by Phil_gretz View Post
Who is Lance Armstrong?
Sheryl Crow's ex-fiancé.
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Old 10-19-21, 01:32 PM
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I carry and recommend a Gerber "Cool Tool" for non-weight weenie types.
Specifically made as a bicycle carry tool, I think I've seen them in different configurations

4 Allens a chain breaker, adjustable wrench etc. It's not a "lite weight" tool though. Standard id say.

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Old 10-19-21, 01:40 PM
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No, I'm sorry, Lance Armstrong is not the answer we were looking for.
We were looking for who is; an ego-maniacal has-been.... with one nut.
.... oh,... wait..... wrong thread.
Never mind
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Old 10-19-21, 11:13 PM
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Originally Posted by Rolla View Post
Instead of hunting down a cap nut, I'd spend $12 on one of these:


Yep... That's one tool I would not leave home without.

I mostly tinker about on old cheap bikes with buggered up Phillips or Common head bolts. I switch them out for Allens all the time. I have a ChiCom outlet stainless steel assortment box of mixed sizes and I just find one close and force it. I know it sounds bad and unprofessional but it works most of the time. If not yes I go through the motions of re-taping but I do prefer the Allens over Phillips heads...
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Old 10-20-21, 01:12 AM
  #21  
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If you want to dive down that hole...

The cross head fasteners on japanese components are frequently JIS standard. Phillips screwdrivers can seem to fit, but have lots of slop because the tip angle is more acute compared to JIS. Slop means stripping!

Save the Phillips head drivers for your wood screws.
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Old 10-20-21, 08:06 AM
  #22  
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Originally Posted by UnCruel View Post
Anyway, does anyone know where I could get a cap nut made to be turned with an allen key wrench?
Maybe a little late but a "socket nut" should work. Allen Socket Nuts : Bel-Metric, Metric Hardware, Metric Fasteners, Metric Bolts, Metric Nuts & Time-Sert Thread Repair (belmetric.com)
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Old 10-20-21, 08:31 AM
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Originally Posted by Unca_Sam View Post
If you want to dive down that hole...

The cross head fasteners on japanese components are frequently JIS standard. Phillips screwdrivers can seem to fit, but have lots of slop because the tip angle is more acute compared to JIS. Slop means stripping!

Save the Phillips head drivers for your wood screws.
After I learned about the JIS standard a few years ago, I bought a JIS screwdriver.
Oh, what a difference when adjusting derailleurs!
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Old 10-20-21, 08:09 PM
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Originally Posted by Shimagnolo View Post
After I learned about the JIS standard a few years ago, I bought a JIS screwdriver.
Oh, what a difference when adjusting derailleurs!
I know, right!
And securing my MTB shifters, pedal cage screws...
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