9 speed on a 7 speed ????
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9 speed on a 7 speed ????
I just got a MINT Trek 6000zx bike (easton frame) for free. I was moving the grip shift and broke the shifter.
I just bought a BRAND NEW Deore shift/brake combo on Ebay ($14). These are a 9 speed shifting system, can this be used on a 7 speed system.
I thought if a adjust the limit screws so the shifter would not try and through the chain, it would be ok.
Thank you for your time and effort
Jace
I just bought a BRAND NEW Deore shift/brake combo on Ebay ($14). These are a 9 speed shifting system, can this be used on a 7 speed system.
I thought if a adjust the limit screws so the shifter would not try and through the chain, it would be ok.
Thank you for your time and effort
Jace
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No. You must match the number of speeds of the shifter to the number of cogs in the cassette. Your derailleur will work with 9-speed stuff though, if you decide to upgrade.
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No,it won't work.A 9 speed shifter will move smaller distances than a 7 speed shifter,so it won't line up with a 7 speed cassette or freewheel.Your best bet would be to get a cheapo 9 speed wheel-cassette combo off ebay.Make sure your rear spacing can accomodate it-135 mm.You probably can't stuff a 135 hub in a 126mm spacing,but the rear wheels usually have a spacer you can remove(it might make the rear wheel slightly out of line with the front wheel,but it isn't a high speed motorcycle,so no big deal).Luck,Charlie
Last edited by phoebeisis; 04-03-06 at 04:26 PM.
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Actually you might be able to do this -- sort of. Sheldon Brown has a bit on using 8 out of 9 sprockets of a 9-speed cassette with 9 speed shifters, on a 7-speed freehub here. You would need to pick up a 9-speed cassette if you don't already have one.
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Originally Posted by jacewb
so it plain won't work?
will it not pull enough cable?
whats going to happen if i do?
will it not pull enough cable?
whats going to happen if i do?
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No, it just won't work.The 9 speed shifter will pull just a bit too little cable when it makes its 1st shift.This shift-say from biggest to next biggest,will probably work,but it will be making "noise" the whole time.The next shift will probably not really work-it will be constantly shifting back and forth.You won't be able to get the shifter to line up with the cogs-except for one cog on whichever end you chose.
The 9 speed shifter's cable pulls will just be too short.Luck,Charlie
The 9 speed shifter's cable pulls will just be too short.Luck,Charlie
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'nother gave you the only correct answer. Follow the link he gave you. You take one cog off of a 9 speed cassette. Your new nine speed shifter will work, but you'll only have eight speeds. You'll also need a 9 speed chain.
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Originally Posted by Dirtdrop
'nother gave you the only correct answer. Follow the link he gave you. You take one cog off of a 9 speed cassette. Your new nine speed shifter will work, but you'll only have eight speeds. You'll also need a 9 speed chain.
...or you could just spend about $20 and get a new 7 speed MRX rear gripshifter, use your old chain, cassette, and wheel and call it a day.
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Originally Posted by OneTinSloth
no, i'm pretty sure the other answers were correct, as a 9 speed shifter will absolutely never work with a 7 speed cassette...
The other answers were not incorrect per se; they were just not looking at all of the options.
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However it would be weird having sprockets 1 - 7, and not having 8 - 9. You could climb great but you would be pedaling more in the high gear for sure.
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Originally Posted by blue_neon
However it would be weird having sprockets 1 - 7, and not having 8 - 9. You could climb great but you would be pedaling more in the high gear for sure.
BTW, you will have to get one of the "lower line" Shimano 9-speed cassettes, 105 or below, since you have to remove the largest sprocket. The Ultegra and Dura Ace cassettes have several of the largest cogs mounted on a spider and they can't be removed individually.
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Originally Posted by HillRider
BTW, you will have to get one of the "lower line" Shimano 9-speed cassettes, 105 or below, since you have to remove the largest sprocket. The Ultegra and Dura Ace cassettes have several of the largest cogs mounted on a spider and they can't be removed individually.
Edit: you could also get a "mountain" 9s cassette. It doesn't need to be from a "road" group; the spacing is the same.
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Originally Posted by jacewb
I just got a MINT Trek 6000zx bike (easton frame) for free. I was moving the grip shift and broke the shifter.
I just bought a BRAND NEW Deore shift/brake combo on Ebay ($14). These are a 9 speed shifting system, can this be used on a 7 speed system.
I thought if a adjust the limit screws so the shifter would not try and through the chain, it would be ok.
I just bought a BRAND NEW Deore shift/brake combo on Ebay ($14). These are a 9 speed shifting system, can this be used on a 7 speed system.
I thought if a adjust the limit screws so the shifter would not try and through the chain, it would be ok.
...however, if you use the "alternate cable routing" at the rear derailer, there's a fair chance you can get it to work OK. What have you got to lose?
See: https://sheldonbrown.com/derailer-adj...html#alternate
I would worry more about the brakes. Your Deore brifters are made for "V brakes" or similar "direct-pull" cantilevers. If your bike has the traditional center-pull style cantilevers, (as most 7-speed mtbs do) the brakes will be very feeble with the new style levers. Fortunately, suitable direct-pull cantis are also cheap.
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Originally Posted by jacewb
I just got a MINT Trek 6000zx bike (easton frame) for free. I was moving the grip shift and broke the shifter.
I just bought a BRAND NEW Deore shift/brake combo on Ebay ($14). These are a 9 speed shifting system, can this be used on a 7 speed system.
I thought if a adjust the limit screws so the shifter would not try and through the chain, it would be ok.
Thank you for your time and effort
Jace
I just bought a BRAND NEW Deore shift/brake combo on Ebay ($14). These are a 9 speed shifting system, can this be used on a 7 speed system.
I thought if a adjust the limit screws so the shifter would not try and through the chain, it would be ok.
Thank you for your time and effort
Jace
Jtek Engineering makes an adapter to make mismatched shifters and cassettes work. He can modify it to suit just about any combo. He modified his stock product to allow my nine-speed shifters to index perfectly with my 8-speed cassette. Call him he may be able to help.
https://jtekengineering.com/