Shimano , makers of high - remainder bike gear I ca n’t give , is do a thrust for its Di2 shelling - power gear shifter . Why make the sentence - tested wheel design more complicated and harder to serve ? Aerodynamics .
The Di2 , which costs a prohibitory $ 4,000 , uses very sensitive paddle shifter placed just behind the brakes . The front derailleur has a tiny estimator that decides the cogwheel based on the position of the rearward derailleur . The trouble is that it ’s power by a little Li ion battery , which of course has a limited kitchen range ; a bike equipped with the Di2 ca n’t run without the battery . The system is design so that shift the front gear is taken aid of and the passenger does n’t have to shift his body , make current of air drag . Allegedly it shaved almost two seconds off Tour de France passenger Chris Boardman ’s prison term .
But for us daily commuter , our loyal , analog , manually - shifted bikes are n’t exit to have batteries in them any clock time presently . I can shift on my own , thank you very much . [ NYTimes ]
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