jason-at-specialized

I design bikes

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jason-at-specialized mikelevy's article
Dec 22, 2014 at 10:54
Dec 22, 2014
Pinkbike Awards: Downhill Bike of the Year Nominees
Guest reviewer for the Troll Gallery - count me in.
jason-at-specialized mikelevy's article
Dec 19, 2014 at 21:16
Dec 19, 2014
Pinkbike Awards: Downhill Bike of the Year Nominees
Perhaps you could post a chart or graph that leads you to this forward axle path conclusion of the Demo. And then compare it to some of your favorite bikes. I'd like to compare your method of calculation to my own.
jason-at-specialized mikelevy's article
Dec 19, 2014 at 17:22
Dec 19, 2014
Pinkbike Awards: Downhill Bike of the Year Nominees
"VPP" is a marketing name for "Instantaneous Center", which is an engineering text book parameter that results from 4-bar linkage designs. VPP, DW and FSR are all 4-bar designs, all with an instant center. The rear wheel rotates around this instant center. But since the instant center is a moving center (hence the "instant" or "instantaneous" part) the rear wheel doesn't move in a perfect arc, it moves more like a parabola. It does not at any point rotate around any single hard pivot such as the "main" pivot, and all force and motion calculations are applied about the instant center. In the case of the Demo, the fact that the chainstay pivot is concentric with the bottom bracket has nothing to do with the bikes performance. As several astute individuals already pointed out, the kinematic response of the new Demo is nearly identical to the old Demo, even though the pivots are in radically different locations.
jason-at-specialized pinkbikeaudience's article
Sep 17, 2014 at 9:34
Sep 17, 2014
Video: Hills Don't Lie
Those elbows are more scar than ink by now.
jason-at-specialized pinkbikeaudience's article
Sep 5, 2014 at 9:28
Sep 5, 2014
Video: Putting the Pedals Down With Aaron Gwin
135 doesn't automatically mean a rear wheel is less stiff. Many hub makers use the same flange width on both 135 and 150. Not saying that is the right way to do it, but we shouldn't assume 150 is stiffer.
jason-at-specialized jason-at-specialized's video
Aug 28, 2014 at 8:48
Aug 28, 2014
video
I wonder if he still thinks 34 is old?

Added 1 video
Aug 27, 2014 at 15:27
Aug 27, 2014
3 comments – Add comment
jason-at-specialized sterlinglorence's photo
Aug 16, 2014 at 21:13
Aug 16, 2014
Just a few years ago this trick would have been enough for the win!

jason-at-specialized mikelevy's article
Aug 16, 2014 at 16:37
Aug 16, 2014
2015 Specialized Demo - Design and Development
There are simple adapters to step down to 22mm, but you can't adapt up to 30mm.
jason-at-specialized mikelevy's article
Aug 16, 2014 at 16:32
Aug 16, 2014
2015 Specialized Demo - Design and Development
It feels like a failure in the eyes of ProTour.
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