April 16, 2010 – Shimano presents a completely new drivetrain technology for mountain bikes: Dyna-Sys. This revolutionary technology uses a 10-speed cassette, but that is not the only feature of this new system. Highlight is a completely redesigned drivetrain that creates real added benefits to the rider.

Dyna-Sys
– It’s not only an extra gear…
– It’s about closer gear ratios for a smoother shifting performance and improved power transfer
– It’s about riding optimized gear combinations that improve efficiency and durability
– It’s all about performance: Dyna-Sys offers a more stable drivetrain for any type of rider!

Shimano introduces a wide range of 3 X 10 Mountain Bike components with Dyna-Sys drivetrain. Available already this spring will be the new DEORE XT and SLX groups, as well as a Dyna-Sys non-series crankset FC-M552 in black and silver. These products are an addition to the 9-speed components; they can easily be recognized by the Dyna-Sys logo. Visually, the components are identical to the 9-speed versions. Technically, they offer the new state-of-the-art in component technology: Dyna-Sys.

Completely new drivetrain
Shimano has changed the standard set-up of the drivetrain to increase the efficiency and achieve a remarkable stability. The current standard set up is 44-32-22 teeth chain rings combined with 9-speed cassette sprockets. This will change to 42-32-24 teeth chain rings combined with 10-speed cassette sprockets.

The advantages of a closer ratio front drivetrain with wider range cassette sprockets:

1. Increased efficiency
– A wider range 10-speed HG cassette means riders can spend more time in the 32T middle chain ring. And when they do have to drop to the granny, it’s a smoother, faster shift thanks to the more useable 24T inner chain ring. Also the 42T big-ring is easier to ride and smoother to get into so riders will use it more.
– Traditionally, riders have had to get used to making two or three recovery shifts in the rear every time they drop into the 22T granny. With Dyna-Sys, it’s just one recovery shift and it’s needed less often.
– Dyna-Sys makes shifting to the granny a seamless transition, letting riders deliver consistent, efficient power while maintaining cadence.

2. Remarkable stability
– An all-new directional mountain bike specific 10-speed chain means smoother shifts, lighter weight and greater overall performance.
– Closer gear ratios mean smaller jumps in between gears, more efficient chain movement and less chance of dropping a chain in rough conditions.
– Tighter cable routing and shorter rear derailleur housing make the system less prone to contamination, trail chatter or suspension movement.

Overview of the new Dyna-Sys products

Shimano DEORE XT (3 X 10)

FC-M770-10 HOLLOWTECH II crankset
– 42-32-24T
– Steel/carbon composite middle chain ring for great durability

RD-M773-SGS/RD-M773-GS SHADOW rear derailleur
– Total capacity 43T (SGS), 35T (GS)
– Pulleys with sealed bearings

FD-M770-10 Top Swing Front Derailleur
FD-M770-10E Top Swing Front Derailleur (BB Mount)
FD-M771-10 Down Swing Front Derailleur
FD-M771-10D Direct Mount Front Derailleur

SL-M770-10/R
– Two Way Release, Multi Release
– Removable Optical Gear Display

CS-M771-10 Cassette Sprockets
– 11-36T / 11-34T
– Two spiders with 3 sprockets each
– Alloy lock ring

CN-HG94 HG-X 10-speed chain
– Directional chain for optimized shifting performance
– Right side optimized for perfect front shifting at the chain rings
– Left side optimized for perfect rear shifting at the sprockets
– Excellent mud shedding thanks to the special outer link plate design
– Zinc-alloy plated
– Not compatible with 10-speed road chains!

Shimano SLX (3 X 10)

FC-M660-10 HOLLOWTECH II crankset
– 42-32-24T
– Steel/glassfibre composite middle chain ring for great durability

RD-M663-SGS Shadow rear derailleur
– Total capacity 43T

FD-M660-10 Top Swing Front Derailleur
FD-M660-10E Top Swing Front Derailleur (BB Mount)
FD-M661-10 Down Swing Front Derailleur
FD-M661-10D Direct Mount Front Derailleur

SL-M660-10/R RAPIDFIRE PLUS shifter
– Two Way Release, Multi Release
– Removable Optical Gear Display

CS-HG81-10 Cassette Sprockets
– 11-36T / 11-34T
– Two spiders with 3 sprockets each

CN-HG74 HG-X 10-speed chain
– Directional chain for optimized shifting performance
– Right side optimized for perfect front shifting at the chain rings
– Left side optimized for perfect rear shifting at the sprockets
– Excellent mud shedding thanks to the special outer link plate design
– Grey
– Not compatible with 10-speed road chains!

Shimano Non-Series (3 X 10)

FC-M552 2-piece crankset
– 42-32-24T
– Steel/glassfibre composite middle chain ring for great durability
– Available in silver or black

With Dyna-Sys 3 X 10, Shimano brings the benefits of increased efficiency to the classic mountain bike riding style.

For more information about Dyna-Sys check out our website www.dynasystech.com.