Shimano Dura-Ace SL-BS79

No, the SL-BS79 shifters are specifically designed for 10-speed Shimano road drivetrains. They will not provide the correct cable pull for 11-speed or 12-speed systems.

Yes, the left shifter uses a friction-based mechanism, which makes it compatible with both double and triple front chainring setups. You simply adjust the lever position until the chain is trimmed correctly.

No, the set comes with the necessary shifter cables and housing included, so you have everything you need for a standard installation right out of the box.

These are specifically designed for bar-end mounting, typically found on time trial or triathlon bikes. They will not fit standard road bike drop bars, which require integrated brake/shift levers (STI shifters).

The friction-based design allows for infinite adjustment, which is helpful for trimming the front derailleur to prevent chain rub. It also provides the flexibility to work with a wider range of front derailleur and crankset combinations compared to indexed shifters.

These shifters are designed to fit standard bar-end openings with a clamp diameter range of 19-22mm, which is standard for most time trial and triathlon base bars.