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How to bleed Shimano disc brakes
While it seems difficult bleeding disc brakes is not hard. Really nothing much new is needed that you wouldn't already have in your tool box.

Is Sram a threat to Shimano's dominance?
Shimano has grown to a cycling market colossus since entering the market in the 1970s. In the 90s it was virtually the only option for a complete Mountain Bike group set, and did battle with Campagnolo for the road bike segment. So despite Sram so aggressively chasing Shimano's market share why is Shimano still so dominant?

Shimano 11speed 9000 leaked details
Shimano Dura Ace 7900 while maintaining market dominance with strong OEM sales, has never wowed users with the floorless performance 7800 had. While still selling strong some users did change to SRAM. Sram is now coming out with a new lower weight group that shimano 7900 doesn't compete with too well. So what is Shimano going to do? The answer is the Dura Ace 9000 groupset due to be released to OEM during this year, and you'd expect pro teams to be using it at least by the Tour de France. Full commercial details haven't come out yet, but there have been OEM briefings to try and secure sales for the 2013 bikes which will actually start coming on the market in the second half of 2012.

Classic Steel Mountain Bike Breezer 29er style
When you talk about classic steel mountain bikes Breezer has to be one considered. While Classic steel road bikes typically mean Italian, Mountain Biking started in the US and the old school classics all come from there.