Mountain Bike Derailleur Vs Road Bike

A rear derailleur often referred to as a rear mech is the mechanism that moves the chain from cog to cog on the cassette at the rear of the bike. First invented in 1906 it was clunky unpopular and had two speeds. The right hand gear shifter on the handlebars pulls a cable or uses electronic signals to move the derailleur which in turn moves the chain onto the appropriate cog on the cassette.

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That may be true.

Mountain bike derailleur vs road bike. The pull ratio for a road front derailleur is different than the pull ratio for a mountain front derailleur. With shimano s latest xt m8000 groupset offering a simplified 12 different models of front derailleur and sram s x0 range made up of 40 models it s. Mountain bike front derailleurs. Mountain derailleur with mountain shifter road derailleur with road shifters.

Your rear derailleur is a technological marvel. The best mountain bike derailleurs today are durable easy to tune and can shift smoothly even under load. Because you want to climb better. I just know i run a sram force front derailleur on my mtn bike with a sram x0 gripshift and an xtr shadow rear with sram attack gripshift for that.

But the front derailleurs are specific to the shifters. They ve come a long way since. So using an index front shifter like triggers for a mountain bike does not work well with a road bike front derailleur. For this reason and in some cases the amount of cable pull needed to move the front derailleur you can t mix road cranksets with mountain front derailleurs and mountain cranksets with road front derailleurs.

Fd s need to be shaped to the number of chainrings typically 2 less so common 3 on a road bike vs often 3 on a mountain bike as well as the size of the chainrings. You should buy a new derailleur for the same reason the first one was invented. The spacing between the chainrings for the same gearing ie 9 speed vs 9 speed is the same on road and mountain. Most 8 and 9 speed shimano mountain bike and road kit is inter compatible because they both use the same cable pull ratio.

This means that you can use an 8 or 9 speed mountain bike derailleur.