What the heck is Mega9?
#1
Emondafied
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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?
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?
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#2
Still kicking.
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.
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.
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Last edited by Dannihilator; 06-24-11 at 09:00 PM.
#3
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^^ yep.
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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.
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#5
Still kicking.
Limit screws need to be adjusted 1/8 turn at a time.
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+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. ?
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. ?
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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.
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.
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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.
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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.
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.
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.
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.
You'd be getting more rub on a narrower cage and you wouldn't be able to use as many gears on the back.
I can force it into the big ring by holding the thumb lever
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
it is reluctant to drop to the small ring too
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
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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 outer limit screw needs to be unscrewed enough so this can happen on the outer chainring.
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!
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