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Smux edspratt's article
Jul 13, 2019 at 13:56
Jul 13, 2019
Final Results: Les Gets World Cup DH 2019
How do they find so much grip? Amazing how much speed Loic and Amaury can carry!
Smux davetrumpore's article
Apr 2, 2017 at 23:01
Apr 2, 2017
Air Downhill: Photo Epic - Crankworx Rotorua 2017
Why don't the Crankworx events attract more big name WC DH riders? (Gwin, Bruni, Hart, the Athertons, etc.) For sponsors and factory teams I'd figure more exposure is better, so why not fly their athletes out to compete? I guess the type of riding is fairly different between the WC and Air DH, but is there another reason that I haven't thought of?
Smux pinkbikeaudience's article
Mar 20, 2017 at 22:33
Mar 20, 2017
Eric Barone Smashes Mountain Bike World Speed Record - Video
I'm amazed he was able to recover from that.
Smux laurenjenkins's article
Jan 12, 2017 at 10:29
Jan 12, 2017
Snapshot: Examining the UCI's Changes to World Cup DH Racing
I'm a big fan of this article. It was very interesting hearing from so many informed people with such varying opinions. I didn't fully understand the implications of the rule change before reading this. I thought Claudio's point about protected riders was particularly interesting. It seems like UCI might need to make some changes in the near future if they want the talent they cultivate in the junior field to transfer into women's elite.
Smux ellsworthbikes's article
Jan 7, 2017 at 0:37
Jan 7, 2017
Smux mikekazimer's article
Sep 19, 2016 at 19:45
Sep 19, 2016
Smux mikekazimer's article
Sep 19, 2016 at 17:40
Sep 19, 2016
Brake Power Meter Prototype - Interbike 2016
@SJP: Yeah. I think that's what they were talking about when they mentioned how they can't measure breaking power dissipated when wheels are locked up. I'm interested in how they plan to account for that. However, when you're breaking without locking wheels, I think it's a safe approximation to assume that whatever energy is dissipated between the wheel and the ground is very small relative to the energy dissipated by the brakes.
Smux mikekazimer's article
Sep 19, 2016 at 17:30
Sep 19, 2016
Brake Power Meter Prototype - Interbike 2016
I thought of another reason too. If you are measuring only wheel velocity and brake torque, braking power can be calculated without knowing any of the specifics of the braking system (e.g rotor diameter, piston area, or coefficient of friction). For example, we know: (Power) = (Torque) * (Angular Velocity) (1) We can approximate (Torque) as: (Torque) = (Brake pressure) * (Piston area) * (Coefficient of Friction) * (Rotor radius) (2) Then we can plug this equation for torque back into (1) to find power, but then the user needs to know these extra numbers and enter them into a computer or something. Anyway, I'm done nerding out now.
Smux mikekazimer's article
Sep 19, 2016 at 17:21
Sep 19, 2016
Brake Power Meter Prototype - Interbike 2016
I think if you used brake pressure and extrapolated to find braking force you would end up with a lot of error. Your calculation would rely on knowing the friction factor between the pads and the rotor, and that's something that is very hard to know accurately since it's a function of temperature, the presence of dust or water, specific brake pad compound, etc. By measuring the torque and wheel velocity directly, there are no approximations in the calculation of brake power. Thus the calculation will be more accurate and reliable.
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