If you’ve been keeping up with what’s new in the mountain bike world, you’ve probably already heard of Shimano’s Dyna-Sys technology (and you will definitely see these components popping up on 2011 model bikes). So what is this big shift (pardon the pun) in Shimano’s mountain bike drivetrain systems?
Basically Shimano has come up with a family of 10-speed mountain bike components, with a goal of optimizing drivetrain efficiency. Most folks with Dyna-Sys will have a 3×10 setup (with a 3 ring crankset and 10-speed rear cassette), although a 2×10 option will be available as part of the racing-oriented XTR Race component system (the XTR Trail system has a triple crankset).
The goal of the new 3×10 setup is to allow the rider to stay in the 32-tooth middle ring for more of the ride (since so many full-suspension bikes are designed around this standard) by adding a wider range 10-speed 11-36 tooth rear cassette to the mix (although 11-32 & 11-34 are also available). When you do need to shift the front derailleur, Dyna-Sys cranksets feature “CloseStep” gearing so that shifting from the middle 32-tooth ring is smoother; instead of a 22-tooth granny gear, there is a 24-tooth ring, and instead of a 44-tooth big ring, there is a 42-tooth ring. The overall gearing range doesn’t change that much from a standard 27-speed setup, but you’ll be able to stay in the middle ring longer and experience a better transition when you do need to up- or down-shift with the front derailleur. A new 10-speed chain, derailleurs & shifters are needed to complete a Dyna-Sys drivetrain.
For a visual explanation of the changes, check out this video featuring our local Shimano technical training representative, who dropped by our headquarters to talk to our Spin Doctor Product Support team (our in-house technical experts that are ready to answer your questions via phone or email):
Dyna-Sys technology will be available as part of Shimano’s XTR, XT and SLX components, so you’ll be able to try out this new drivetrain technology for yourself as an upgrade to your existing ride or on a new 2011 mountain bike.
New 10-speed Dyna-Sys XT components are available on our wesbite right now, and XTR components are due in very soon. As always, if you have any questions about these new components and how to upgrade, get in touch with our Spin Doctor Product Support team and they’ll be happy to help.