Advertise on Bikeforums.net



User Tag List

Page 1 of 2 12 LastLast
Results 1 to 25 of 30
  1. #1
    Member geeyoff's Avatar
    Join Date
    Apr 2005
    Location
    Dallas
    My Bikes
    Anonymous European old-skool 10-speed road bike, Cannondale Road Warrior 400 LE
    Posts
    25
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Need an oddly-sized hex wrench

    Hi. I recently got an old European road bike, and I need to adjust the handlebars, but I can't find a hex wrench that fits the socket. 6mm is too small, but 8mm is too large. 5/16" is too small, but 3/8" is too large. (At least, I think it was 3/8"; it mighta been mislabelled.) And my local hardware store sells nothing in between those sizes that I've mentioned.

    Is there some funky hex size that's standard for bikes which I wouldn't find a small, poorly-organized hardware store? Or does anybody know where I could order a 7mm hex wrench for cheap?

    Thanks.

  2. #2
    Senior Member
    Join Date
    Jun 2005
    Location
    SO CA
    My Bikes
    '79 Univega Sport Tour (not stock). Mid 80's Benotto, bring back to life. Mid 80's Univega Alpina Ultima (needs TLC, still built strong). Trek 400. Specialized Globe. DS Expert Ironman. Schwinn World Sport (soon to be a SS).
    Posts
    189
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Sears, Kragen, Auto Zone, Grainger, McMaster-Carr and maybe even Wally World ought to have a 7mm hex drive. 7mm is not odd. You might even get lucky at a local garage sale.

  3. #3
    Decrepit Member Scooper's Avatar
    Join Date
    Aug 2005
    Location
    San Francisco California
    My Bikes
    Waterford 953 RS-22
    Posts
    8,967
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I ran into the same problem. Sears didn't have a 7 mm hex wrench except as one of eleven in a set (946814), so I wound up buying the set. I didn't have any luck at other retailers, either. Most of the sets skip from 6 mm to 8 mm.

    Very strange.
    - Stan

  4. #4
    Senior Member
    Join Date
    Dec 2006
    Location
    Aurora,CO
    Posts
    298
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    for the most part a allen head thats going to use a 7mm key is going to be a 7mm bolt also. in europe that is a normal size here in the US it is an oddball size that no one in the US really stocks. While the rest of the world uses metric including bike manufactures the US is still using SAE for the most part.

  5. #5
    Videre non videri
    Join Date
    Sep 2004
    Location
    Gothenburg, Sweden
    My Bikes
    1 road bike (simple, light), 1 TT bike (could be more aero, could be lighter), 1 all-weather commuter and winter bike, 1 Monark 828E ergometer indoor bike
    Posts
    3,204
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by geeyoff
    6mm is too small, but 8mm is too large. 5/16" is too small, but 3/8" is too large.
    6 mm is too small.
    5/16" (7.93 mm) is too small.
    8 mm is too large.
    3/8" (9.53 mm) is too large.

    I doubt there's a 7.97 mm hex available...

  6. #6
    Senior Member Bill Kapaun's Avatar
    Join Date
    Feb 2007
    Location
    Mid Willamette Valley, Orygun
    My Bikes
    86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
    Posts
    7,386
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by geeyoff
    "...but 8mm is too large. 5/16" is too small....".
    8mm = .31496
    5/16 = .31250

    Difference is less than .0025"!! It doesn't make sense that one is too big and one is too small.
    Sounds like something other than an Allen head.

  7. #7
    LF for the accentdeprived
    Join Date
    May 2005
    Location
    Budapest, Hungary
    Posts
    3,550
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    See? You guys shouldn't have invented that silly sizing system. You'd have well adjusted handlebars and a working Mars probe.
    Quote Originally Posted by dutret
    Do you deny that you are clueless or do you just think that "moron" didn't need to be tacked on there?
    Bike on flickr and on FGG

  8. #8
    Senior Citizen lyeinyoureye's Avatar
    Join Date
    Feb 2005
    Location
    no
    My Bikes
    yes
    Posts
    1,347
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If you need a 7mm hex key, and have a hardware store near by, you may be able to get two 7mm nuts on a whatever sized bolt and use the appropriately sized socket/ratchet or wrench. That being said, what CdCf said.

  9. #9
    mousse de chocolat Moose's Avatar
    Join Date
    Jul 2001
    Location
    Northeast Ohio, USA
    My Bikes
    Soma Double Cross, Raleigh Rush Hour, Fuji America Fixed, "Modernized" Gitane
    Posts
    1,135
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    11/32" ?

  10. #10
    Senior Member MudPie's Avatar
    Join Date
    May 2004
    Location
    Southern California
    Posts
    1,874
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by LóFarkas
    See? You guys shouldn't have invented that silly sizing system. You'd have well adjusted handlebars and a working Mars probe.
    Off topic:

    I couldn't agree with you more! When I was in grammar school (mid 70's), they started to teach us the metric system, then worked with it throughout high school and engineering school. The minute I graduated, and started working, American industry is all about to the English units of measurement. Do the English even use the English system of units anymore? I suspect even they went metric.

  11. #11
    Videre non videri
    Join Date
    Sep 2004
    Location
    Gothenburg, Sweden
    My Bikes
    1 road bike (simple, light), 1 TT bike (could be more aero, could be lighter), 1 all-weather commuter and winter bike, 1 Monark 828E ergometer indoor bike
    Posts
    3,204
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by MudPie
    Off topic:
    Do the English even use the English system of units anymore? I suspect even they went metric.
    I think people in general still mostly use the old units, at least for bodyweight, height and probably also for distances. Most likely not in engineering and science, though.

  12. #12
    Videre non videri
    Join Date
    Sep 2004
    Location
    Gothenburg, Sweden
    My Bikes
    1 road bike (simple, light), 1 TT bike (could be more aero, could be lighter), 1 all-weather commuter and winter bike, 1 Monark 828E ergometer indoor bike
    Posts
    3,204
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    And I've also come up with a fraction that should fit! 161/512 should do the trick!!!

  13. #13
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    26,180
    Mentioned
    14 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Bill Kapaun
    8mm = .31496
    5/16 = .31250

    Difference is less than .0025"!! It doesn't make sense that one is too big and one is too small.
    Sounds like something other than an Allen head.
    I agree that this doesn't make sense. In most real world applications, 5/16" and 8 mm wrenches can be used interchangably. BTW, if a 5/16" is really too small, then a 7 mm will be even smaller so don't bother looking for one.

  14. #14
    You know you want to. Eatadonut's Avatar
    Join Date
    Jun 2005
    Location
    Norman, Oklahoma
    My Bikes
    Pinarello Prince, 1980's 531 steel fixie commuter, FrankenMTB
    Posts
    1,896
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    maybe what you need is a new 5/16 wrench.
    Weather today: Hot. Humid. Potholes.

  15. #15
    Senior Member Bill Kapaun's Avatar
    Join Date
    Feb 2007
    Location
    Mid Willamette Valley, Orygun
    My Bikes
    86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
    Posts
    7,386
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Bill Kapaun
    8mm = .31496
    5/16 = .31250

    Difference is less than .0025"!! It doesn't make sense that one is too big and one is too small.
    Sounds like something other than an Allen head.
    Thinking about it a bit more, my guess is:
    It's been "buggered" by using too large of a wrench. Try LIGHTLY tapping an 5/16" into the hex.
    Else the OP has got his wrench sizes mixed up.

    Could it be a Brit bike with the old Whitworth? size? It shouldn't matter though.
    Last edited by Bill Kapaun; 02-11-07 at 04:30 PM.

  16. #16
    Banned.
    Join Date
    Jan 2006
    Location
    not a bike lane in sight, TX
    Posts
    300
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I found out that you need a 7mm hex to change the brakes on my friend's f***ing Jetta. You can get a Hex socket set at Wally World for around $8 that has a 7mm hex included.

  17. #17
    Senior Member
    Join Date
    Oct 2005
    Posts
    1,735
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by MudPie
    Do the English even use the English system of units anymore? I suspect even they went metric.
    You don't go to the pub and ask for "a litre of your finest draught!!", you ask for a pint.

  18. #18
    Senior Member
    Join Date
    Feb 2005
    Location
    SW Florida
    My Bikes
    '04 Trek 2300; '06 Bianchi Pista; '57 Maclean; '10 Scott CR1 Pro; 2005 Trek 2000 Tandem; '09 Comotion Macchiato Tandem; 199? Novara Road
    Posts
    1,235
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by evictionsurplus
    I found out that you need a 7mm hex to change the brakes on my friend's f***ing Jetta. You can get a Hex socket set at Wally World for around $8 that has a 7mm hex included.
    I found the same. For some strange reason the hex socket sets I have don't include 7mm, so I had to buy the 7mm socket from AutoZone to replace my cars' brake pads.

  19. #19
    Senior Member
    Join Date
    Feb 2005
    Location
    SW Florida
    My Bikes
    '04 Trek 2300; '06 Bianchi Pista; '57 Maclean; '10 Scott CR1 Pro; 2005 Trek 2000 Tandem; '09 Comotion Macchiato Tandem; 199? Novara Road
    Posts
    1,235
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by masiman
    You don't go to the pub and ask for "a litre of your finest draught!!", you ask for a pint.
    True, but by law all foodstuff in shops is now sold in metric weight/measure and people use metric for personal height/weight. Temperatures changed to Celsius years ago but it was a long time before the weather forecast went solely metric. For years F and C were quoted until people got used to it.

  20. #20
    Senior Member
    Join Date
    Oct 2005
    Posts
    1,735
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Artmo
    True, but by law all foodstuff in shops is now sold in metric weight/measure and people use metric for personal height/weight. Temperatures changed to Celsius years ago but it was a long time before the weather forecast went solely metric. For years F and C were quoted until people got used to it.
    I wish they would do the same here. They made talked the talk in the 70s but no one walked it. They do the dual labeling on foodstuffs here to, but everything is talked about in metric units. Except for scientists, soda bottles and some other things I can't think of.

  21. #21
    Senior Member MudPie's Avatar
    Join Date
    May 2004
    Location
    Southern California
    Posts
    1,874
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by masiman
    I wish they would do the same here. They made talked the talk in the 70s but no one walked it. They do the dual labeling on foodstuffs here to, but everything is talked about in metric units. Except for scientists, soda bottles and some other things I can't think of.
    Drug dealers in America talk in grams and kilo(grams).

  22. #22
    Member geeyoff's Avatar
    Join Date
    Apr 2005
    Location
    Dallas
    My Bikes
    Anonymous European old-skool 10-speed road bike, Cannondale Road Warrior 400 LE
    Posts
    25
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    It's quite likely that I wasn't actually using a 5/16" wrench -- the one hardware store in my neighborhood is really great at incorrectly stocking their stuff. And when you ask an employee a question -- any kind of question -- they look at you with utter pity for having been born so stupid.

    Anyway, I've got a 7mm wrench on its way, so we'll see...

  23. #23
    Senior Member
    Join Date
    Oct 2005
    Posts
    1,735
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by MudPie
    Drug dealers in America talk in grams and kilo(grams).
    I should have scientists and medicos (doctors, nurses and their suppliers).

  24. #24
    Senior Member
    Join Date
    May 2005
    Posts
    6,900
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by evictionsurplus
    I found out that you need a 7mm hex to change the brakes on my friend's f***ing Jetta. You can get a Hex socket set at Wally World for around $8 that has a 7mm hex included.
    True story. When I was in college I took my VW bug to a one man repair place and the guy did not own 1 metric tool. He said you don't need them and he knew what American size would work on everything. Guy was amazing. Had a 30 foot long work bench and no tool box. All the tools were just piled up on the bench but when he needed a certain wrench or whatever he just knew where he put it down.

  25. #25
    LF for the accentdeprived
    Join Date
    May 2005
    Location
    Budapest, Hungary
    Posts
    3,550
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    ^ Good way to strip a few bolts.
    Quote Originally Posted by dutret
    Do you deny that you are clueless or do you just think that "moron" didn't need to be tacked on there?
    Bike on flickr and on FGG

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •