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juancancook RichardCunningham's article

Jul 17, 2012 at 9:09

Jul 17, 2012

Tech Tuesday - Switch Hoses Without Bleeding Your Brakes

RC, bad idea. If you pump the pistons out, you draw fluid out of the reservoir, putting the diaphragm in a vacuum state. The second you remove the brake line from the master cylinder, that diaphragm is going to expand and in doing so suck air into the master cylinder. When you hook the line back up and push the pistons in you may purge the air from the master cylinder bore and into the reservoir, but it'll still be there, and it can still get drawn back into the system during use or storage, resulting in an inopportune brake failure. If you really want to do this, you should remove the pads and push the pistons back into their bores first, and then remove the brake line. This will keep the diaphragm in a neutral state so it will not suck air back into the system.

juancancook RichardCunningham's article

Jul 3, 2012 at 7:10

Jul 3, 2012

SRAM XX1 Eleven Speed Drivetrain - First Look

Interesting. Aside from the unsprung weight there's another thing to consider here- torque input on the hub. Already seen 29er hubs blow up from running 36t cassettes and 32t chainrings. There's a lot more torque with that 42t, and a lot more of an arc being cut before hub engagement, even on hubs with 7degrees or less. I trust they built their hubs up to match the input loads, but I surely hope that any other hub manufacturer that jumps on board with this program tests the heck outta their hubs to insure they won't self distruct on a hard shift.

juancancook mikelevy's article

Jun 8, 2012 at 6:26

Jun 8, 2012

Pinkbike Product Picks

WAKI, last helmets I saw made anywhere but China were UVEX out of Germany. Been plenty content with mine.

juancancook

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