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Old 02-24-14, 04:53 AM   #1
Saving Hawaii
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Weird 3ttt hex size

I've got an old 3ttt stem on my bike and I cannot figure out the size of the hex key needed to adjust it. 6mm spins freely. 8mm is very close but just quite doesn't fit. Anybody have any idea what this would be? A trip to a hardware store and 3 LBSs yielded no dice.
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Old 02-24-14, 05:14 AM   #2
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Originally Posted by Saving Hawaii View Post
6mm spins freely. 8mm is very close but just quite doesn't fit.
Umm... [edit out I was being...backwards...] You checked the standard and metric sizes below? (note only the whole size metric is a wrench you will find, the other is just a conversion number)
5/32 in 3.97 mm
4 mm
3/16 in 4.76 mm
5 mm
13/64 in 5.16 mm
7/32 in 5.56 mm
15/64 in 6.05 mm
6 mm
1/4 in 6.35 mm
17/64 in 6.75 mm
7 mm
9/32 in 7.14 mm
5/16 in 7.94 mm
8 mm
11/32 in 8.73 mm
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Last edited by RoadTire; 02-24-14 at 06:11 AM.
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Old 02-24-14, 05:51 AM   #3
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7mm
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Old 02-24-14, 05:54 AM   #4
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6mm spins freely. 8mm is very close but just quite doesn't fit.
Have you tried 7mm? I have a French "Atax" stem that uses a 7mm Allen key.
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Old 02-24-14, 06:02 AM   #5
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I would try a 7mm next. A 6mm will spin freely in a 7mm hole.
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Old 02-24-14, 06:09 AM   #6
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Weird 3ttt hex size

7mm allen keys are hard to find. I found a set of allen keys on ebay which included a 7mm.
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Old 02-24-14, 06:11 AM   #7
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Sure, 7mm sounds right, but how can "a trip to a hardware store and 3 LBSs yielded no dice?" It's an allen wrench for goodness sake.
(And ya, I edited my previous post 'cause I was being stupid.. *sigh*)
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Old 02-24-14, 06:53 AM   #8
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Originally Posted by big chainring View Post
7mm allen keys are hard to find. I found a set of allen keys on ebay which included a 7mm.
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Originally Posted by RoadTire View Post
Sure, 7mm sounds right, but how can "a trip to a hardware store and 3 LBSs yielded no dice?" It's an allen wrench for goodness sake.
(And ya, I edited my previous post 'cause I was being stupid.. *sigh*)
Sears, Home Depot, or Lowes. Not surprised the LBS did not have one.
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Old 02-24-14, 07:38 AM   #9
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Have the same stem as yours. 7mm would have worked but bolts were stripped and frozen beyond hope.
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Old 02-24-14, 07:46 AM   #10
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Harbor Freight has a few allen wrench sets that include a 7 mm one.
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Old 02-24-14, 09:10 AM   #11
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+10

7mm. Auto parts stores, too. I found a single 7mm socket. My french bikes both require it.
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Old 02-24-14, 09:10 AM   #12
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Just get one of the tools that has a bunch of allen keys that swing out. I have one each for metric and inches. They're great in tool bags on bikes as well.
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Old 02-24-14, 09:51 AM   #13
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Like they said. It's a 7mm. Cinelli used 7mm for a long time too. They are hard to find. Try Harbor Freight.
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Old 02-24-14, 11:48 AM   #14
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I think campy used 7mm for thier early versions of self-extracting crankset bolts too, good idea to keep a 7mm around in your vintage toolbox.
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Old 02-24-14, 04:22 PM   #15
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[h=1]Husky 3/8 in. Drive 7 mm Hex Bit Socket[/h]
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Old 02-24-14, 05:43 PM   #16
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+1

When searching upon discovery that my girlfriend's '71 Raleigh International sports a Cinelli requiring a 7mm, it appeared that a 7mm socket was easier to come by than a 7mm Allen key (indeed, both large local hardware stores had the former, but not the latter).
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Old 02-24-14, 06:27 PM   #17
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... it appeared that a 7mm socket was easier to come by than a 7mm Allen key
Yep, like hen's teeth. I'll trade you my 7mm hex wrench for two un-cracked 10T Campy derailleur pulleys. Just kidding. I need the wrench, I don't need pulleys.
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Old 02-24-14, 06:45 PM   #18
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Like they said. It's a 7mm. Cinelli used 7mm for a long time too. They are hard to find. Try Harbor Freight.
Perhaps 6-7 years and the stems are a whole lot harder to find than a 7mm key.

The 1A alloy was introduced in 1968 and I will guess that the move to 6mm happened either before or when the pinch bolt when to allen (1975), which makes about 6 production years for the first 1A stem. Addtionally, I wouldn't be surprised if there were variations in there. The 1R had a 6mm binder from the beginning and was introduced in 1973. I wouldn't be surprised if the 1A went to 6mm around that time, which would make it more like 4 production years for the 7mm bolt.

Does anyone had a 1A with 6mm key fitting and 12mm hex nut on the binder as evidence to support this theory?

For the record I used to have bin of odd allen keys and I just took one that was bigger than 7mm and filed it down equally on each side a couple strokes until it fit. i wasn't going to spend the money when I had a whole bunch of perfectly useless duplicate keys that could be modified.
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Old 02-24-14, 07:00 PM   #19
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Originally Posted by mikemowbz View Post
+1

When searching upon discovery that my girlfriend's '71 Raleigh International sports a Cinelli requiring a 7mm, it appeared that a 7mm socket was easier to come by than a 7mm Allen key (indeed, both large local hardware stores had the former, but not the latter).

...it also has the advantage of giving you a choice for a longer lever arm
when you need to use it on those Campy self extracting crank bolt thingies.
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