Advertise on Bikeforums.net



User Tag List

Results 1 to 18 of 18
  1. #1
    Senior Member blknwhtfoto's Avatar
    Join Date
    Feb 2006
    Posts
    203
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Any reason not to replace limit screws with allen heads?

    Hey guys,
    Is there any reason that I shouldn't replace the limit screws on my SRAM X-7 rear der and Sora front der with allen bolts? I just want to have as much of the bike hex head as I can, because I am sick of hunting screw drivers of various sizes and shapes.
    Any reason not to make the switch?
    Thanks,
    Mike

  2. #2
    Senior Member sykerocker's Avatar
    Join Date
    Dec 2005
    Location
    Montpelier, VA
    My Bikes
    The keepers: 1960 Raleigh Lenton Grand Prix, 1968 Ranger, 1969 Magneet Sprint, 1971 Gitane Tour de France, 1973 Raleigh Tourist, 1973 Lambert, 1973 Schwinn Super Sport, 2 - 1988 Rossins
    Posts
    3,809
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    No reason whatsoever, although I think it would be a touch of overkill. Think about it for a moment: once you have the limit screws set properly, how often do you touch them again? At which oint, does it really matter what heads are used?

    As you can probably guess, the manufacturers use philips and straight head screws for cost. Probably saves them $00.005 per derailleur - which adds up over a year's production.
    Syke

    "No wonder we keep testing positive in their bicycle races. Everyone looks like they're full of testosterone when they're surrounded by Frenchmen." ---Argus Hamilton

  3. #3
    Senior Member Grand Bois's Avatar
    Join Date
    Mar 2005
    Location
    Pinole, CA, USA
    Posts
    15,101
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    For just a little bit more you can use stainless allen screws that won't rust. For a whole lot more you can use titanium and save a couple of grams. That would be ridiculous, but I've done it.

  4. #4
    Senior Member blknwhtfoto's Avatar
    Join Date
    Feb 2006
    Posts
    203
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I have to adjust my front derailleur a lot for some reason. Every two months, usually. The heads are getting a bit too close to stripped for my tastes as well.
    I'm not too worried about weight weenie issues, I ride a SWB recumbent and while a light 'bent compared to other bents, a gram or two isn't going to kill me.
    Thanks
    Mike

  5. #5
    Newbie
    Join Date
    Sep 2006
    Posts
    3
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Id be afraid the smaller allens would strip more easily... they seem to do that.

  6. #6
    Senior Member
    Join Date
    Dec 2005
    Posts
    203
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    small allen key bolts are alot easier to use then screws, and wont round off as long as your using a high quality allen key.

    but on the other hand a high quality screwdriver of the correct type and size wont round off a screw head either....

  7. #7
    Senior Member
    Join Date
    Jul 2005
    Posts
    3,190
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Boy, I thought some of my upgrade ideas were overkill. Apparently I'm just an apprentice. bk

  8. #8
    Senior Member Retro Grouch's Avatar
    Join Date
    Feb 2004
    Location
    St Peters, Missouri
    My Bikes
    Rans Enduro Sport, Hase Kettweisel Tandem, Merin Bear Valley beater bike
    Posts
    23,604
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by blknwhtfoto
    I have to adjust my front derailleur a lot for some reason. Every two months, usually. The heads are getting a bit too close to stripped for my tastes as well.
    If you find yourself adjusting your derailleur limit screws that often, you're doing something wrong. That should be a set it and forget it adjustment.

  9. #9
    Wot no bike? pahearn's Avatar
    Join Date
    May 2006
    Posts
    91
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I don't think it's a matter of overkill at all, in fact I think it's a great idea in certain circumstances. Consider this: Due to the linkage/swingarm design on my FS bike, it's damn near impossible to fit a screwdriver in to adjust one of the limit screws. If it were an Allen, the small right-angled wrench would fit in there perfectly. This is a great idea and I think I'll do just that -- thanks for the idea.

    -pete

  10. #10
    cab horn
    Join Date
    Jun 2004
    Location
    Toronto
    My Bikes
    1987 Bianchi Campione
    Posts
    28,292
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by The Great Stonk
    small allen key bolts are alot easier to use then screws, and wont round off as long as your using a high quality allen key.

    but on the other hand a high quality screwdriver of the correct type and size wont round off a screw head either....
    Ironically it's the complete opposite. The phillips head is deisnged push the bit back before it can strip. Allen bolts on the other hand do not have this "feature".
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  11. #11
    Senior Member
    Join Date
    Dec 2005
    Posts
    203
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by operator
    Ironically it's the complete opposite. The phillips head is deisnged push the bit back before it can strip. Allen bolts on the other hand do not have this "feature".
    and at the tiny ammounts of torque needed to turn the screws in question, that feature is not exactly important.

  12. #12
    GATC
    Join Date
    Jul 2006
    Location
    south Puget Sound
    Posts
    6,597
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Retro Grouch
    If you find yourself adjusting your derailleur limit screws that often, you're doing something wrong. That should be a set it and forget it adjustment.
    That's interesting to hear. I've been amazed at how much tweaking my one bike takes for its derailers, and so very relieved at how little the other one requires. I guess it's kind of like how your head feels so much better when you stop whacking it with a stick.

  13. #13
    Elitist Troglodyte DMF's Avatar
    Join Date
    Jun 2006
    Location
    Dallas
    My Bikes
    03 Raleigh Professional (steel)
    Posts
    6,887
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by operator
    The phillips head is designed to push the bit back before it can strip. Allen bolts on the other hand do not have this "feature".
    Yes, but the Phillips is expressly designed for machine drivers. A human driver should not strip a slot head unless the bit is fubar (and it's surprising how many are). A fubar Phillips bit will strip the head over time, too.

    A clean Allen head should never strip if the key is fully seated. The problem is that an upright Allen head collects dirt and prevents the key from seating. It's a pain to clean. Same with Torx. A better replacement would be hex-head.

    blknwhtfoto, a dérailleur will gradually go out of adjustment with cable stretch. That should be adjusted with the barrel adjuster or trim instead of the limit screws. The limit screws should be set-and-forget. Are you sure you're adjusting the right thing? Are both ends of the bike index-shifted?
    Stupidity got us into this mess - why can't it get us out?

    - Will Rogers

  14. #14
    Senior Member blknwhtfoto's Avatar
    Join Date
    Feb 2006
    Posts
    203
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    There is a good chance that I am adjusting the wrong thing. But, whenever I sit down to work on my bike I try to set the barrel adjuster and the problem is still there. The front derailleur I have shifts a little bit 4mm or so to either the left or the right. It is enough that when I grab a big pile of shifter, it'll derail if I don't keep it in adjustment. I am thinking that a new front der might be good. I don't think this is overkill because I would much rather have to only collect one set of good tools, rather than multiple sets for all the different heads. Also, it isn't very hard to replace a screw...I'm not doing this for weight, only that want a bike that can be worked on with a minimal tool kit, when I am out on the road, the fewer extra things the better.

  15. #15
    Death fork? Naaaah!! top506's Avatar
    Join Date
    Nov 2005
    Location
    The other Maine, north of RT 2
    My Bikes
    '71 Gitane Super Corsa, '73 Atala Giro d'Italia, '73 Schwinn Super Sport, '76 Viscount Aerospace Pro, '81 Miyata 710, '81 Lotus Classique, '84 Ross Signature 290s, '84 Shogun 500, '85 Miele Gara, '87 Miyata 512, '89 Centurion Ironman, many more
    Posts
    3,037
    Mentioned
    6 Post(s)
    Tagged
    0 Thread(s)
    Great idea!
    I have often replaced DR and 'B' adjustment screrws with longer ones to increase the range of adjustment, but never thought to use allen screws.
    I guess I don't have to turn down any more screwheads
    Top

  16. #16
    Elitist Troglodyte DMF's Avatar
    Join Date
    Jun 2006
    Location
    Dallas
    My Bikes
    03 Raleigh Professional (steel)
    Posts
    6,887
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by blknwhtfoto
    whenever I sit down to work on my bike I try to set the barrel adjuster and the problem is still there.
    Do you sit on the bike while adjusting? There may be enough frame flex (especially on a 'bent) to make the difference.
    Stupidity got us into this mess - why can't it get us out?

    - Will Rogers

  17. #17
    cab horn
    Join Date
    Jun 2004
    Location
    Toronto
    My Bikes
    1987 Bianchi Campione
    Posts
    28,292
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by The Great Stonk
    and at the tiny ammounts of torque needed to turn the screws in question, that feature is not exactly important.
    You should try working at a bikeshop.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  18. #18
    Senior Member
    Join Date
    Aug 2005
    Location
    Minneapolis, MN
    Posts
    745
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Another good spot to replace the soft phillips heads screws with stainless socket heads is the spring tension adjusting screws on linear pull brakes. Also 4mm.

Posting Permissions

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