any guess the total weight of the new group. historically shimano remove over 100gm of weight when introducing new dura-ace iteration.
2017 Giant TCR Advanced SL 0 DI2 9150
- Don't ask me the number but Dura Ace EX was first
- Dura Ace AX was next, why has no-one made anything as pretty since? Those brakes, the crank with the big pedal holes, the housing-less rear derailler, the use of blue plastic! ahhh lovely
- 7400 came out in 1985 as 6 speed (I bought it 7sp in 1986)
- 7400 saw some big running changes which Shimano doesn't do any more without releasing a new groupset:
....1. moved from 6sp to 7sp in 1986 (big visual change was silver to dark anodized shifters)
....2. got the more spindley crank arms in 1988 or 1989
....3. moved from single to double pivot brakes around the same time (?)
....4. we got some really nice Look-based pedals in 1990
....5. and, of course, moved to STI in 1990 or 1991
- 7700 came out in 1996
- 7800 came out in 2002 (Lance used it in Tour that year) then 2003 to the masses
....* biggest running change was the 7810 carbon crank set, which didn't last :-(
- 7900 came out in 2007
....* Di2 release when, 2010?
- 9000 will come out in 2012. So by my calcs it's the same interval?
EDIT: Hammertime, thanks for reminding me about the 8sp , Road STi was only ever 8sp or more. I guess the 7400 to 7410 number *was* like a new groupset but b/c the FD, RD, HS, seatpost remained the same they didn't change the 74xx series. Although there was a lot of jiggery-pokery with the rear ders, you had to buy one with "6s 7s" on the cage to work with 7speed. Then they changed the cable pull when they moved to 8 speed so it was probably a new parallelogram even tho it looked identical.
I thought 7900 was a 2008 release for the pro's and a 2009 wide release
Di2 in 2009 as well I thought:
so it does look like a pretty quick turn around from 7900
spartan wrote:i believe shimano and campagnolo have strict agreements on teams using complete drivetrains for sponsoship. cervelo/garmin have a contract to use rotor crankset for 2012 hence they need to buy parts.
That makes sense,still suprising that they shunned SRAM and they prefer to buy equipment out of their own budget though. CSC did the same a while back in their early days and more recently HTC did the same with wheels.
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Discs would solve the carbon clincher problem though!! You wont have to build that rim to withstand heat buildup.
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