Description Shimano's Dura-Ace Di2, a technologically advanced, electronic shifting option for the all new 7900 series Dura-Ace. Comprised of Dual Control type shift / brake levers, front derailleur, rear deraill...
Favorite Ride: Anywhere with decent pavement and low traffic
Bike Setup: 2010 Specialized Allez, full Dura Ace Di2 groupo, Alpha Q post, Selle SMP saddle, Neuvation wheelset.
Summary: After reading so many positive reviews of the performance of the Di2 at this site and elsewhere, I decided to pull the trigger. Given the price, I was definitely nervous about the purchase and hoped that it was all that others claimed it to be. Today was my first ride with the Di2 and I'm totally impressed! For the last year I've ridden a DA 7800 groupo and I thought it was a drastic improvement to my previous Ultegra group. The different between the DA 7800 and the Di2 is like going from the Stone Age to the Space Age. The Di2 performs the kind of shifting you've always wanted but never received with each new component group purchase. As I read at another review, if you can't buy it don't ride it--you'll only cause yourself heartache.
Strengths: Performance, performance, performance. The rear derailleur shifts like nobody's business. The front derailleur is even better in that is self-trims at the first sign of chain rub and the shifting is effortless. Furthermore, while riding with double gloved hands today operating the shifting buttons was a breeze.
Weaknesses: Price, but only to a degree. If you consider the difference in performance between a 7800 groupo and the Di2, it's a fair value. My price was for a full groupo, not just the upgrade kit.
Similar Products Used: Dura Ace 7800 groupo and Shimano Ultegra groupo.
Summary: The function of this group completely out does the hype. The effortless shifting and absolutely no more adjustments makes this the best groupo I have ever riden. If you are sitting on the fence, go ahead an get it, the price is steep but well worth it.
Summary: Its probably just me but this groupo took my bikes soul... It went from being a beautiful mechanical machine to an electronic gadget in the space of the few hours it took to install. It works well enough nothing though nothing significantly better than my existing dura ace though.
Strengths: really its not worth it keep your integrity,
Weaknesses: It turns a bike into an ipod, i hope UCI bans this before it goes to far
Summary: WOW! Whatever your expectation about how electronic shifting will change your riding experience...the reality is better! Shifts are effortless...front and rear. It's a mouseclick. The front derailleur now shifts as easily as the rear. Adjustments are a thing of the past. You need to ride it to understand the impact the system will have on your riding.
Shimano got it right.
Strengths: Accuracy...weight...smoothness...ease of use
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