On my road bike (which I also use for tri),I have am Ultegra SL 6600 system, with a 11-25 cassette.
I need to buy new cassette and chain.
I was thinking of buying a dura-ace 7900 chain and an ultegra 6700 cassette.
Should it work fine for me?
And if I switch to a 11-28 cassette, will I have any problem with the rear derailleur? (long/short etc.)
And another thing - If I’ll swithc the shifters to the new ultegra 6700. Will that work with my existing derailleurs? (rear dura-ace 7800 (I think), front ultegra SL 6600)
11x28 cassette will work, however you may need to add a few links of chain. The lowest gear may make a little bit of rubbing noise against the upper pulley. Shimano says no, but this setup is on my wifes bike fine. Also may need to adjust the upper screw that pulls the derailleur back.
From Shimano (I think) regarding shifters:
IRVINE, CA (BRAIN)—Shimano Ultegra 6700 is entirely new for 2010 and borrows the look and many features of the Dura Ace 7900 series to drop 150 grams of weight compared to Ultegra 6600.
The most noticeable change is the redesigned crankset that borrows Dura Ace technology for its hollow large chainring to keep things light and stiff for crisp shifting. The look is also clearly Dura Ace inspired. The new crank saves 15 grams over the current Ultegra SL crank.
And like Dura Ace, ST-6700 Dual Control Levers feature hidden cables so everything is under the tape. The levers have carbon blades, are more compact than previous Ultegra levers, now have reach adjustment and easier braking from the hoods.
ST-6700 levers are backwards compatible with 6600 series Ultegra drivetrains and brakes, though Shimano says mixing the groups will not take full advantage of the new features. The front derailleur stroke of the new group is similar to the 6600 front derailleur, but the brakes have revised pivots like Dura Ace.
Derailleurs all adopt wider pivots for less flex and the group uses an asymmetrical chain similar to Dura Ace.
Brakes have revised pivots similar to Dura Ace groups, but because the front derailleur stroke remains similar to 6600 Ultegra, backward compatibility is possible.
Rounding out the new group is the WH-6700 Ultegra wheelset, which weighs 1650 grams and is Road Tubeless compatible
All the components you mention are interchangeable. As the previous poster brought up, if you switch to an 11-28 cassette, your new chain may need to have a few more links in it than the old chain did.
Why not a 12-28
I know I want that 16 more than the 11. I find the jump from 15-17 annoying. Often, I’m either running too low a cadence or too high.
If you’re racing with it, you might as well tuck at anything over 32-33 mph.
Why not a 12-28
I know I want that 16 more than the 11. I find the jump from 15-17 annoying. Often, I’m either running too low a cadence or too high.
If you’re racing with it, you might as well tuck at anything over 32-33 mph.
+1
I don’t recommend the Shimano 11-28. It will work OK with a short-cage Ultegra derailleur, that’s not the problem. The problem is it gives you an 11-15 straight block, where you’ll spend relatively little of your time. Then, on the gears where you’ll be spending a lot of time, it jumps 15-17-19-21-24-28. The jump from the 21 to the 24 is not great, but manageable. The jump from the 24 to the 28 is annoying (but manageable) for training, but it is way too big for racing.
I do miss the 16, but I also use the 11 from time to time. (the 11-25 which I currently own has the same problem)
When I had the 12, it wasn’t enough.
The SRAM cassette is also compatible with Shimano’s chain and derailleurs?
Maybe I can consider the SRAM’s 11-28. (Is it any better, except it has a 19-22-25-28, instead of shimano’s which has a 19-21-24-28)
*I want to use it for both training and racing.
Regarding the 25 or 28 - I use the 25, and i’ts ok. going uphill in really hard climbs is hard but doable. Now that I need to buy a new cassette, I think “why not”.
I do miss the 16, but I also use the 11 from time to time. (the 11-25 which I currently own has the same problem)
When I had the 12, it wasn’t enough.
The SRAM cassette is also compatible with Shimano’s chain and derailleurs?
Maybe I can consider the SRAM’s 11-28. (Is it any better, except it has a 19-22-25-28, instead of shimano’s which has a 19-21-24-28)
*I want to use it for both training and racing.
Regarding the 25 or 28 - I use the 25, and i’ts ok. going uphill in really hard climbs is hard but doable. Now that I need to buy a new cassette, I think “why not”.
Again, I say you don’t need the 11. For descending, the high cadence needed for the 12 is good training and for racing, you might as well tuck. I guess it would be useful for a mild downhill with a tailwind, but that’s the odd event.