Elec­tric Is Here To Stay Shi­mano’s New Dura-ace Di2 Groupset

Triathlon Magazine Canada - - Front Page - By An­dre Cheuk

Rider­smight have been skep­ti­cal, but the ar­rival of Shi­mano’s Di2 groupset four years ago raised the bar for bi­cy­cle com­po­nents. Triath­letes have the most to gain from this in­no­va­tive sys­tem thanks to the bar end and brake hood shift­ing, but will also ben­e­fit from the im­proved shift speed and re­li­a­bil­ity. The new 9070 Di2 group shares cranks and brakes with its me­chan­i­cal sib­ling, but the en­tire group is much lighter than in years past. It’s also much more user-friendly and cus­tom­iz­a­ble. It won’t be this year or next, but Shi­mano’s lat­est Di2 of­fer­ing proves that the fu­ture is elec­tric. Bat­tery The ex­ter­nal bat­tery is the sole com­po­nent car­ried over from the orig­i­nal Di2 group. Now, though, there is also an in­ter­nal bat­tery op­tion that fits in­side the seat­post. Ac­cord­ing to Shi­mano, when us­ing the in­ter­nal bat­tery (which holds a charge sim­i­lar to the ex­ter­nal one), the new Di2 group is ac­tu­ally lighter than me­chan­i­cal Dura-Ace. Rear De­railleur The new rear de­railleur is steam­lined and looks com­pa­ra­ble to its me­chan­i­cal rel­a­tive. The 9070 de­railleur also has the abil­ity to shift through the en­tire cas­sette with a sin­gle touch. Crankset The new four- arm spi­der gives the 9000- se­ries cranks a strik­ing new ap­pear­ance. By elim­i­nat­ing the fifth arm, and care­fully po­si­tion­ing the re­main­ing four, the chain­rings are well sup­ported dur­ing the power phase ( pic­ture your pedal stroke as work­ing around a clock – this would be be­tween 3 and 9 o’clock), main­tain­ing stiff­ness that en­hances shift qual­ity. The three- di­men­sional hol­low chain­rings pro­vide im­pres­sive stiff­ness, which di­rects all your en­ergy into mov­ing for­ward, but re­main re­mark­ably light. An added bonus of the new ar­range­ments is the abil­ity to swap from a stan­dard ( 52/38, 53/39 or 55/42) to a com­pact setup ( 50/34 and 52/36) without swap­ping cranks. Rac­ing a flat fast course like Ironman Ari­zona? Set a new PB with the 53/39 setup. Rac­ing Muskoka 70.3? Throw on the 50/34 com­pact to spin your way up the steep grades to a berth at the world cham­pi­onship. Shi­mano’s new 52/36 op­tion prom­ises to of­fer the best of both set­ups for cour­ses like Chal­lenge Pen­tic­ton and Ironman Mont-Trem­blant, with the com­bi­na­tion of long up­hills and fast de­scents.



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