Shimano Dura Ace Di2 7970 Electronic
2010 Shimano Dura Ace Di2 ST-7970 STI Levers
For all the chatter about electronic shifting replacing mechanical, the place where people will love it or hate it is at the shift lever. Shimano rightly lavished plenty of attention when they designed the Dura Ace Di2 Dual Control levers. In order for the Di2 levers to work at shifting your ...read more
2010 Shimano Dura Ace Di2 Rear Derailleur, Wire Kit, and Battery System
Shimano's Dura Ace electronic Di2 rear derailleur, RD-7970, pretty closely resembles the RD-7900, their mechanical derailleur. It has the same 11t pulleys, the same carbon pulley cages, the same body shape, and the same black anodized finish. But a close look reveals how different it is. The ...read more
2010 Shimano Dura Ace Di2 Front Derailleur and Wire Kit
A self-trimming front derailleur; a dream that disappeared with the Suntour Cyclone Mark II down tube shifter. Until now: Believe it or not, the Shimano Dura Ace Di2 FD-7970 front derailleur trims itself. That cool. Frickin' cool. Jaw-dropping cool. Something so amazing you do have to see it to ...read more
2010 Shimano Dura Ace CN-7900 Chain
A chain is a funny component: We judge them not on what they do do, but rather on what they don't do. If your shifting is crisp and you don't get chain suck and your drivetrain is quiet when you pedal -- how can you improve upon that? Shimano understands this, and with their Dura Ace CN-7900 ...read more
2010 Shimano Dura Ace FC-7900/7950 Crankset
We'll start by defining some terms here about the Shimano Dura Ace FC-7900 crankset. When you see "FC-7900", that refers to the 53/39 chainring combo of this crankset, a.k.a. a "standard" crankset. When you see "FC-7950", that refers to the 50/34 chainring combo, a.k.a. a "compact" crankset. This is ...read more
2010 Shimano Dura Ace CS-7900 Cassette
The Shimano Dura Ace CS-7900 cassette provides you with a wealth of gearing options unlike any previous generation of Dura Ace. You get an unprecedented 8 different ratios to choose from -- 11-21, 11-23, 11-25, 11-27, 11-28, 12-23, 12-25, and 12-27. The low 6 cogs are steel, and the high 4 cogs ...read more
2010 Shimano Dura Ace BB-7900 Bottom Bracket
The Shimano Dura Ace BB-7900 Bottom Bracket is a simple and straightforward component. You'll get two cups with low-drag, high-precision Dura Ace bearings, plus a cylindrical dust cover that mates the two cups. What's the difference between the Dura Ace BB-7900 bottom bracket and the previous ...read more
2010 Shimano Dura Ace BR-7900 Brake Calipers
We've been accused of over-interpreting things in the past, and maybe that's exactly what we're doing here. Bear with us, please, and allow us to start with a question: Has anyone here ever had a headache of note with a set of Dura Ace brakes, regardless of the generation? Sure, we remember the ...read more
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