Block user

Recent

rybrentd sarahmoore's article
Jul 16, 2020 at 0:21
Jul 16, 2020
Yeti Cycles Will No Longer Use the Term 'Tribe' in Marketing
@Colson217: Bike mag deleted all the comments. I read them yesterday and they are no longer there, I'd be curious to see what percentage of native american descendants signed that petition vs. self proclaimed representatives. I honestly don't care what yeti does from a marketing standpoint, it's their company and I care more about the engineering behind the products (quality, supply chain, origin,etc.) but having a major publication purge all comments with constructive criticism is disconcerting.
rybrentd brianpark's article
Jun 8, 2020 at 22:33
Jun 8, 2020
Race & Accessibility in the Mountain Bike Community
I abandoned some riding buddies because they were overtly racist. I always enjoyed riding by myself but couldn't ignore the fact that once I stopped riding with them all my friends miraculously disappeared. Sometimes riding the trails by yourself is healing, but sometimes we honor people who are faster than us and they just get a pass. Also, if you are not on social media you don't actually exist, I guess I have a lot to learn.
rybrentd danielsapp's article
Jan 31, 2020 at 16:29
Jan 31, 2020
Pinkbike Poll: How Mechanically Minded Are You?
I maintain/adjust everything on my bike except for shock and fork dampers, including building my own wheelsets. I've been burned/misdiagnosed by almost every bike shop I've been to, with the worst offense being a warrantied guide R lever (the 3rd time) bled by the shop only to find out the front brake had air in it hauling ass down black mountain in Pisgah, NC. I've always bled my own brakes but the one time I trust the shop I get burned. I only take my bike to the shop to warranty SRAM/RS stuff but whenever I do they always try to add on a service I never asked for. Bike shop incompetence necessitated I learn and get all the tools to do it myself, so no, I don't support my LBS.
rybrentd mikekazimer's article
Dec 16, 2019 at 20:27
Dec 16, 2019
Field Test: 2020 Rocky Mountain Slayer Carbon 90 - The One That Broke
-skid more!! -RENO SUCKS Interesting background notes.
rybrentd mikelevy's article
Nov 19, 2019 at 16:30
Nov 19, 2019
Field Test: 2020 Pole Stamina 140 - The Fastest Trail Bike*
@jemima: Also, I forgot to add that it can fail due to buckling OR to compressive yielding due to insufficient material in the thinnest cross section. So you would have to find your critical buckling load and yielding load for 2.0mm and use the smaller of the two and the same applies to 3.6mm. So it may seem that increasing the thickness will increase your buckling strength by a factor of 6 BUT you would also have to double check your yielding in the thinnest cross sectional area to see if that is your weak point. Sometimes failure is due to simply to not having a thick enough cross section.
rybrentd mikelevy's article
Nov 19, 2019 at 16:14
Nov 19, 2019
Field Test: 2020 Pole Stamina 140 - The Fastest Trail Bike*
@dldewar: It does sense to keep it out of the way from the chain. I didn't do any absolute force calculations but I think what bothered me was that is the absolute worst shape to handle a compressive buckling load. You wouldn't necessarily need to use tubing, just a shape that utilizied a somewhat optimized moment of inertia for all loading scenarios.
rybrentd mikelevy's article
Nov 19, 2019 at 16:08
Nov 19, 2019
Field Test: 2020 Pole Stamina 140 - The Fastest Trail Bike*
@jemima: I got the same factor of around 6 going from 2.0mm to 3.6mm thickness (Euler's buckling, second moment of inertia) although it is less with a change from 2.5mm to 3.5mm.
rybrentd mikelevy's article
Nov 18, 2019 at 18:42
Nov 18, 2019
Field Test: 2020 Pole Stamina 140 - The Fastest Trail Bike*
I'm not normally one to comment but here is my take. From an engineering/FEA standpoint that strut is essentially useless, even if they increase the thickness by 1 mm. It bent along the weak axis (low moment of inertia) and increasing only the thickness, and not the shape (key point), of that strut will not do much of anything especially considering the impact that bent it and the mode of failure. By not taking advantage of using tubing in that area (a shape that can be manipulated to be strong in any and all directions AND yield a higher moment of inertia per cross sectional area) it looks to be a poorly designed point of failure. Prototype or not is irrelevant, someone didn't due their due diligence on basic engineering mechanics on shape/moment of inertia in the axis (or axes) of bending. Sorry if that sounds harsh but that is something you pick up in a college engineering mechanics course, and especially steel design.
rybrentd edspratt's article
Oct 28, 2019 at 11:45
Oct 28, 2019
5 Things We Learned at Red Bull Rampage 2019
It could be a situation where the steerer tube pulls through the headtube but the headtube keeps its shape. https://www.youtube.com/watch?v=vu9IN8X0JOU (look at 3:25) In regards to the YT, It looked like the steerer tube was intact but just pulled through in a similar manner to that video.
rybrentd pinkbikeaudience's article
Oct 21, 2019 at 18:16
Oct 21, 2019
Red Bull Rampage Fantasy Contest: Win a RockShox Boxxer Ultimate
1. Andreu Lacondeguy 2. Brandon Semenuk 3. Cam Zink
Load more...
You must login to Pinkbike.
Don't have an account? Sign up

Join Pinkbike  Login
Copyright © 2000 - 2020. Pinkbike.com. All rights reserved.
dv65 0.015635
Mobile Version of Website