can I use a 18 speed front derailer on an 21 speed mountain bike
10-17-13, 05:39 PM
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can I use a 18 speed front derailer on an 21 speed mountain bike
can I use a 18 speed front de railer on an 21 speed mountain bike
if it is the same pull and brand??
I looked at a lot of front derailer's for sale on ebay, a lot of them say they are 8 speed, 9
speed, what speed would a front de railer be.
if it is the same pull and brand??
I looked at a lot of front derailer's for sale on ebay, a lot of them say they are 8 speed, 9
speed, what speed would a front de railer be.
10-17-13, 06:45 PM
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Greetings.
Short answer: yes.
Long answer: I'm assuming you're talking about a 3x7 (=21speed) and a 3x6 (=18speed) setup. Many 18speeds are 2x9;you might be better off if you thought of the number of speeds, in terms of compatibility, in terms of how many up front and how many in back. The number out back is particularly important, as it will determine the width of the chain, the required shifter (if indexed), and even which chainrings would be optimal for your setup. The front derailers tend to differ in terms of swing, pull direction (top, bottom, dual), style/size of clamp (or other form of attachment, eg braze-on, e-type), and probably most important, the parallelogram in terms of being designed for double- or triple-ring cranksets.
hth
-rob
Short answer: yes.
Long answer: I'm assuming you're talking about a 3x7 (=21speed) and a 3x6 (=18speed) setup. Many 18speeds are 2x9;you might be better off if you thought of the number of speeds, in terms of compatibility, in terms of how many up front and how many in back. The number out back is particularly important, as it will determine the width of the chain, the required shifter (if indexed), and even which chainrings would be optimal for your setup. The front derailers tend to differ in terms of swing, pull direction (top, bottom, dual), style/size of clamp (or other form of attachment, eg braze-on, e-type), and probably most important, the parallelogram in terms of being designed for double- or triple-ring cranksets.
hth
-rob
