I am looking at two different 29er bikes. The $1,100.00 2011 Specialized Rockhopper Expert 29er is equipped with Shimano BR-M505 hydraulic brakes with 160mm rotors and the $1,300.00 Specialized Rockhopper Pro 29er is equipped with Avid Juicy 3ís with 160mm rotors.
Without getting to far into the debate of which company produces better products, are the J3ís and upgrade over the Shimano M505ís?
I currently own one set of Avid J5ís and one set of J7ís, both of which have had the dreaded turkey warbler squeal caused by sticky pistons. At one point I was at the end of my rope with these Juicy brakes until I learned to coat the caliper pistons with automotive silicon brake grease before pressing them back into their bores. This silicone grease acts like a make shift dust shield and prevents dirt and brake dust from working its way under the seals and jamming the pistons.
I live in a dusty area and therefore am concerned that the Shimano M505 pistons/seals will get contaminated and jamb the pistons like the Avid pistons.
2A) Does Shimano sell rebuilding kits for their calipers? If not, how does a own go about freeing a sticky piston that has dirt lodged in its seal?
2B) Are Shimano Brakes easy to bleed?
2C) Are Shimano bleed kit reasonably priced?
2D) How do these mineral oil hydraulic brakes perform in 35 degree weather? I plan on using this 29er for commuting and smooth mountain bike trails.
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