Advertise on Bikeforums.net



User Tag List

Results 1 to 11 of 11
  1. #1
    Emondafied cydewaze's Avatar
    Join Date
    May 2005
    Location
    Maryland
    My Bikes
    Trek Emonda SL, Scattante XLR, Jamis Dakar Expert, Alpinestars Al-Mega, Trek 9700
    Posts
    4,426
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    What the heck is Mega9?

    I just upgraded my Trek 9700 drivetrain to SLX stuff (RD, crank, chain, shifters), but I didn't bother to get the front derailleur because I already had a 9-sp (E-type) XT front that I bought some time ago.

    I'm having a bit of trouble getting the front derailleur adjusted, so I started to wonder if my memory was correct and it really was a 9-sp, so I examined it and found a "Mega9" sticker on the top of the cage.

    What the heck is "Mega9" and is it compatible with the rest of my SLX 9-sp stuff?

  2. #2
    To be continued Dannihilator's Avatar
    Join Date
    Oct 2002
    Location
    Annandale, NJ.
    My Bikes
    2014 Surly Steamroller, 1977 Puch Pathfinder
    Posts
    19,074
    Mentioned
    25 Post(s)
    Tagged
    1 Thread(s)
    It is fully compatible.

    Mega 9 was what shimano originally called the 9 speed stuff when it first came out. Just like how dyna-sys is shimano's terminology for 10 speed mtb stuff.
    Last edited by Dannihilator; 06-24-11 at 10:00 PM.
    Strike like an eagle and sacrifice the dove.
    Words and Stuff.

  3. #3
    Extra Medium Member redtires's Avatar
    Join Date
    Jul 2006
    Location
    Louisville, Co
    My Bikes
    Fuji Roubaix 1.0 (Sampson Kalispell Ti GONE); VooDoo Wanga (Specialized Stumpy: GONE)
    Posts
    1,613
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    ^^ yep.
    Coming to you from and brought to you by:
    Department of redundancy department.

  4. #4
    Emondafied cydewaze's Avatar
    Join Date
    May 2005
    Location
    Maryland
    My Bikes
    Trek Emonda SL, Scattante XLR, Jamis Dakar Expert, Alpinestars Al-Mega, Trek 9700
    Posts
    4,426
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Ah sweet. I guess I just need to get it properly adjusted then. It doesn't seem to want to go into the big ring unless I hold the left thumb shifter, yet it is reluctant to drop to the small ring too. If I tighten the cable, then it rubs in the middle ring when on the big cog out back. I'll fiddle with it more tomorrow.

  5. #5
    To be continued Dannihilator's Avatar
    Join Date
    Oct 2002
    Location
    Annandale, NJ.
    My Bikes
    2014 Surly Steamroller, 1977 Puch Pathfinder
    Posts
    19,074
    Mentioned
    25 Post(s)
    Tagged
    1 Thread(s)
    Limit screws need to be adjusted 1/8 turn at a time.
    Strike like an eagle and sacrifice the dove.
    Words and Stuff.

  6. #6
    use your best eye kenhill3's Avatar
    Join Date
    Mar 2006
    Location
    Olympia, Washington
    My Bikes
    '75 Bertin, '93 Parkpre Team 925, '04 Kona King Kikapu, '05 Bianchi Vigorelli
    Posts
    3,058
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    +1 on limit screws.

    Yup, 'Mega' was Shimano's glossy moniker for 9 speed.

    IIRC, there's also an 8speed cassette in Shimano's line up with a 36t called Mega. ?
    "I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.

  7. #7
    Emondafied cydewaze's Avatar
    Join Date
    May 2005
    Location
    Maryland
    My Bikes
    Trek Emonda SL, Scattante XLR, Jamis Dakar Expert, Alpinestars Al-Mega, Trek 9700
    Posts
    4,426
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Dannihilator View Post
    Limit screws need to be adjusted 1/8 turn at a time.
    It's not that. If it were, pushing the thumb lever wouldn't make it shift. The limit screws would stop it dead. Since I can force it into the big ring by holding the thumb lever, it's telling me it wants the cable to be tighter, but if I tighten it, the chain will rub the inside of the FD cage when the RD is in the biggest cog. Not to mention even more of a reluctance to drop to the granny ring.

    It's acting like the cage is too wide for the chain, but if it's a 9-sp FD, it shouldn't be. It's almost like the pull ratio is wrong or something, like back with those old Dura-Ace road derailleurs, where depending on which side of the bolt you clamped the cable under, you'd get a different ratio. But I don't think I have any options like that with this FD.

  8. #8
    dont make me get the belt scyclops's Avatar
    Join Date
    May 2010
    Location
    Southeastern U.S.
    Posts
    510
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by kenhill3 View Post
    IIRC, there's also an 8speed cassette in Shimano's line up with a 36t called Mega. ?
    MegaRange.
    [SIGPIC][/SIGPIC]
    We have enough youth, how about a fountain of smart?

  9. #9
    Emondafied cydewaze's Avatar
    Join Date
    May 2005
    Location
    Maryland
    My Bikes
    Trek Emonda SL, Scattante XLR, Jamis Dakar Expert, Alpinestars Al-Mega, Trek 9700
    Posts
    4,426
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by scyclops View Post
    MegaRange.
    I've seen those! They're like a huge inner cog on the rear cassette, spaced way away from the others, then there's a big jump to the next gear.

  10. #10
    B A N N E D
    Join Date
    Aug 2006
    Posts
    1,051
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    When tuning the front derailleur you need to have the small front with the large back, middle front with the middle back and the large front with the small back.

    I can force it into the big ring by holding the thumb lever
    This sounds normal.

    When fully pushing the thumb lever as far as it can go the derailleur is going past it's indexed position, you can hear a click midway in the push where the indexed position is. You need fully push it past the indexed position so the derailleur can get the chain to go onto the chainring and you need to hold it till it catches on the chainring. When the chain has caught enough to enable it to go around the chainring you release the shifter and the derailleur will go back to it's indexed position.
    The outer limit screw needs to be unscrewed enough so this can happen on the outer chainring.

    the chain will rub the inside of the FD cage when the RD is in the biggest cog
    If this is happening when you are using the large front chainring then there isn't a problem, this is a cross chain gear and you shouldn't be using it.

    it is reluctant to drop to the small ring too
    Possibly the deurailleur's pivot links are stiff, try a drop of oil on them.
    Is the cable is too tight ?
    What gear are you using on the back when doing this ?
    If it's the small then that might be the problem. Small front and small back are also cross chaining and gears that shouldn't be used.
    As the chain is new it will be much stiffer in it's sideways movement to a old chain and it won't want to go into extreme gear changes like a cross chaining gear, it will want to keep a straight chainline.

    It's acting like the cage is too wide for the chain
    You'd be getting more rub on a narrower cage and you wouldn't be able to use as many gears on the back.

  11. #11
    Emondafied cydewaze's Avatar
    Join Date
    May 2005
    Location
    Maryland
    My Bikes
    Trek Emonda SL, Scattante XLR, Jamis Dakar Expert, Alpinestars Al-Mega, Trek 9700
    Posts
    4,426
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by cobba View Post
    When fully pushing the thumb lever as far as it can go the derailleur is going past it's indexed position, you can hear a click midway in the push where the indexed position is. You need fully push it past the indexed position so the derailleur can get the chain to go onto the chainring and you need to hold it till it catches on the chainring. When the chain has caught enough to enable it to go around the chainring you release the shifter and the derailleur will go back to it's indexed position.

    The outer limit screw needs to be unscrewed enough so this can happen on the outer chainring.
    Going by all that, my current setup is correct other than the chain rub, which as it turns out only actually happens on the stand, so I think I'm ok.


    Quote Originally Posted by cobba View Post
    If this is happening when you are using the large front chainring then there isn't a problem, this is a cross chain gear and you shouldn't be using it.
    It was the middle ring/large cog combo.

    After a bit of tweaking, I *think* I have it right. The holding the thumb shifter thing is what threw me. I'll know for sure after my first actual of-road ride tomorrow morning.

    Thanks for the help!

Posting Permissions

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