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dirt-klaud pinkbikeoriginals's article
Mar 18, 2019 at 17:14
Mar 18, 2019
Video: Friday Fails #60
I was about to agree with your first statement, and then remembered that at a young age with a BMX bike finally in my possession, as soon as I could figure out how to stack up blocks and add a plywood ramp, or build dirt into what would be considered a jump, I was trying to jump. I think the key is to push your limit without going WAAAAY over your head, which certainly some of the folks in these videos are doing. And to not forget about also practicing braking points, turns, trackstands, wheelies... :-)
dirt-klaud Psf1's article
Mar 18, 2019 at 16:41
Mar 18, 2019
Video: Fatbike Freeride in a Snowboard Park
Two of my favorite IG accounts! Those brothers are inspiring in many different ways.
dirt-klaud jamessmurthwaite's article
Mar 1, 2019 at 13:32
Mar 1, 2019
Interview: The Professor Studying the Connections Between Mountain Biking & Music
Yes, this. I wonder how many people need to have the "right" song in their head while riding, but not actually listen to music. If I have something weird in my head before riding, I'll play a minute of a good song to make sure I'm prepared. I have to listen to music during many many parts of my daily life (like working on the computer), but absolutely can't while riding (same goes for dirt bikes) and trying to have a flow. Unless I'm grinding up some long boring climb...
dirt-klaud RichardCunningham's article
Jan 23, 2019 at 13:52
Jan 23, 2019
Exploring the Relationship Between Handlebar vs Stem Length
@Kainerm: Forgot to come back to this...a lot of what you're saying holds up. I just fundamentally disagree with your statement that handlebar offset should be evaluated in isolation from anything else in the steering geometry because it's literally all based on torques about the steering axis. From there, you either don't understand or are using terminology that is confusing me, and either one means we're not getting anywhere so I'll agree to disagree. Most importantly, the fact that people are thinking about and discussing the implications of geometry changes is a good thing. Maybe one day we'll get to a consensus, but then we wouldn't have so much fun arguing on a forum...
dirt-klaud RichardCunningham's article
Jan 11, 2019 at 12:49
Jan 11, 2019
Exploring the Relationship Between Handlebar vs Stem Length
@faul: Interesting additional commentary. I was confused by your first comment also. I think we're all saying the same things: there are a ton of variables in the bike handling equation, and they all matter. I think it's helpful for people to understand what component changes can do to steering feel (or anything else) in general, but I struggle to see articles like this that draw somewhat "absolute" statements about one geometry variable when there are so many things that go into how one bike feels that comparing a single dimension (or effective dimension) between multiple bikes will not give you ability to draw firm conclusions.
dirt-klaud RichardCunningham's article
Jan 11, 2019 at 10:02
Jan 11, 2019
Exploring the Relationship Between Handlebar vs Stem Length
Absolutely. All those things, in conjunction with head tube angle at whatever F/R suspension ride heights you're at during any given moment,and wheelbase, and wheel size, and c.g. height, and steering and lean angles, and speed, and probably a few other things I'm not thinking of at the moment, all affect the way a bike "feels in a turn". But...the basic combination of handlebar dimensions and stem offset are certainly overlooked. Hand position relative to the steering axis is the dimension he's defining. Wheel contact patch vs the steering axis is the other end of the equation. That dimension comes from fork offset, wheel size, and the dynamically changing things I mentioned like head tube angle (which changes with suspension travel differences between front and rear). Comparing the forces at the handlebar vs the reaction at the ground can then be done for any instant in time, while also considering dynamics like rotational inertia. And that shit is complicated and most people don't know how to or want to deal with that. So we look at individual or a combination of static measurements and try to understand how they affect how a bike feels :-)
dirt-klaud RichardCunningham's article
Jan 11, 2019 at 9:37
Jan 11, 2019
Exploring the Relationship Between Handlebar vs Stem Length
@Mondbiker: you're mostly correct, except that shorter fork offset increases trail which slows the steering (using your terms). The key point you're making is true and overlooked, including in this article: all these things matter, and yet also work to do different things at different speeds because bikes lean, and leaning means forces/moments change because the free body diagram changes, and wheel/tire (and even bar/stem/steering component) rotational inertia and dynamics come into play. Those equations are not easy to understand and slap on a Pinkbike article. It's helpful to look at one simple combination of bar and stem specs to help people understand that they can't ignore their interplay, but to ignore the rest of the geometry to make a statement about what effective stem offset is "good" or at the limit of stability is misleading and oversimplifying it greatly.
dirt-klaud RichardCunningham's article
Jan 11, 2019 at 9:26
Jan 11, 2019
Exploring the Relationship Between Handlebar vs Stem Length
@Kainerm: Incorrect. Fork offset is the orthogonal distance the axle axis is as compared to the steering axis and is a fixed number for a given fork. That offset number COMBINED with wheel size and head tube angle defines trail. Then you can start looking at the sum of the moments about the steering axis to understand how the forces interact. This is even still a simplified explanation, because as you turn, you lean, and stability is affected by all of those dimensions but also by the rotational inertia of the wheel/tire you have, which is of course dependent on speed.
dirt-klaud RichardCunningham's article
Jan 11, 2019 at 9:17
Jan 11, 2019
Exploring the Relationship Between Handlebar vs Stem Length
There are some interesting points made, and getting actual measurement data for stem/bar combinations is on the right track, but you have to consider all the features that make up a bike's geometry (and at different suspension travel positions) to determine if the steering will feel "unstable" in certain riding situations. It's good to know that these things are easily overlooked as working together to define hand position, but to say that 20mm effective offset is ideal or a limit is misleading, although probably generally a good assumption for current mountain bike geometries. "Trail" measurements are basically never listed, but are one of the most influential dimensions during riding, and fork offset plays a factor here but is often not included in the discussion. Transition and others are now using a smaller fork offset to increase trail, so you have to look at all those numbers combined to understand stability. The amount of leverage you have at the hand grip as compared to trail, at different speeds, is also a huge factor. Stability changes at different speeds based on head tube angle, trail, and the rotational inertia if the wheel/tires you're running. I could go on, but as usual, the only numbers most people compare are geometry numbers that don't mean nearly as much without the whole swath of data for a given bike. #endrant
dirt-klaud RichardCunningham's article
Dec 13, 2018 at 8:17
Dec 13, 2018
Pinkbike Awards: Value Mountain Bike of the Year Nominees
Hell yeah for the Scout. Plus, the 2019 build kit is even better than the 2018 I bought (although discounted at end of model year), with the 12 speed Eagle NX, better dropper post, slightly wider tires, etc. The Revelation RC definitely needs the charger damper, and I went to Shimano brakes by preference, but god damn this bike is good out of the box.
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