Added a comment about feature We Ride Coil and Air Shocks Back-to-Back 10/18/2017 3:42 PM
C50_88521480_1251936778

Linear fork curves also suck, and engineers have found lots of ways to make coil forks less linear in spring rate. Hydraulic bottom out assist, pneumatic bottom out assist, rubber bottom out bumpers, and of course dual spring rates.

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Added a comment about video Vital RAW - Kasper Dean, Downhill #DGAF 10/18/2017 3:40 PM
C138x104

WOW.

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Liked a comment on the item Vital RAW - Kasper Dean, Downhill #DGAF 10/18/2017 3:37 PM

Possible suspect for the #speedpolice

Added reply in a thread UCI Rule Changes for 2018 10/18/2017 3:36 PM

Chup29, you're operating under the assumption that the UCI wants to improve the sport.

Added a comment about feature We Ride Coil and Air Shocks Back-to-Back 10/17/2017 11:33 AM
C50_88521480_1251936778

Totally, damping is a bandaid solution for bad spring rates, but if your shock feels dead, damping is still an available bandaid solution.

This one of many reasons why I love air suspension- it's so hard to dial in spring rate with coils, and you can't do anything about spring curve progression- it just is what it is. Being able to fine tune spring curve with tokens and being able to fine tune spring rate with little 3 psi bumps is priceless.

Besides the fact that it's a PITA and expensive to buy 2-4 springs before you dial in sag, you never actually dial in sag at all. With a coil shock, even at 25 lb increments, you can only get sag close and you're left to compensate with compression damping to get the feel you want. I find I play with knobs a lot more on coil shocks, because I can't do anything about the spring rate. On my air shock bikes, I rarely touch the dials. If there's a problem, I grab my shock pump.

My hunch is that 90% of suspension performance is related to spring rate, and the rest is just managing how that spring performs. It's the spring that actually holds your weight up. If you can get your spring rate where you want it, you have a lot less futzing with the last 10%.

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Liked a comment on the item Jenson USA Supports IMBA This Weekend 10/17/2017 11:29 AM

I find it very difficult to support much of anything IMBA does regarding trail maintenance/building. Sterilized, almost gravel path construction template.

Added a comment about feature We Ride Coil and Air Shocks Back-to-Back 10/17/2017 9:48 AM
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Johan! Loved the article. I especially like that you took the spacers out for the sake of testing to try to get the air shock feeling more "coil-like."

Have you tried cranking low speed compression on the coil shock to give you more of a platform for jumping (make it feel more like the air shock)? Seems like a lot of the dead/not poppy stuff could be mitigated with a nice stiff low speed platform to push into.

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Added a comment about press release Jenson USA Supports IMBA This Weekend 10/17/2017 9:37 AM
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IMBA sucks.

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Added a comment about feature TECH TALK: Air Shocks Versus Coil Shocks, What's Better? 10/16/2017 12:12 PM
C50_88521480_1251936778

After some reading, adiabatic is a fancy word for "air spring element heats up under use."

The question is: what causes heat build up? Obviously lots of rock smashing for tens of minutes will cause heat build up, but everyone already knows this and it's not what Mandell and Dunc-Dawg are talking about here. After a little more googling, the adiabatic process is a consistent element of all air springs at ALL shaft speeds. It's the big, scary word that hides the reason why air suspension is progressive in nature. As positive spring chamber volume is reduced during compression, rising pressure creates heat, and that new heat increases spring pressure. More importantly, air pressure goes up by a greater rate than volume goes down. If volume goes down by X percent during a compression cycle, air spring pressure goes up by X+Y percent, where Y is a function of heat build up. I haven't read this next bit anywhere, but I'd be willing to bet that as an air spring rebounds to full length, air pressure goes down and with it temps do too, returning to somewhere near the original ambient temp. Otherwise a fork or shock would be hot after a parking lot test. So heat and pressure build up during a single cycle is purely adiabatic, and heat build up after 14 minutes of smashing Garbonzo downhill runs is qualitatively different.

Steel springs don't operate on pressure, so heat build up wouldn't significantly affect spring rate. So that's all a really long way of saying what we already know: air springs are naturally progressive, and coil springs are naturally linear. All we're adding with the word "adiabatic" is the nuance that the progressive nature of air springs is a product of heat build up from pressure changes.

If that's all true, then what Mandell and Dunc-Dawg said is "Progressive air springs feel more progressive because they're progressive." This would represent a not-so-big insight, hiding behind a big, scary, science-y sounding word.

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Added a comment about feature TECH TALK: Air Shocks Versus Coil Shocks, What's Better? 10/16/2017 11:45 AM
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Great analysis and insight.

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Added a comment about feature TECH TALK: Air Shocks Versus Coil Shocks, What's Better? 10/14/2017 8:33 AM
C50_88521480_1251936778

We're not talking about damping circuits and oil here, we're talking about the relative reactive-ness of the different spring materials. What Mandell said was that steel reacts equally at all shaft speeds, air does not.

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Added a comment about feature TECH TALK: Air Shocks Versus Coil Shocks, What's Better? 10/14/2017 5:38 AM
C50_88521480_1251936778

I don't understand. If the adiabatic process occurs at high shaft speeds, why would that affect a low shaft speed moment like pushing into a jump face? By poppy I assume we're talking about jumping. Similarly, small bump impacts are high shaft speed moments, so by this same process wouldn't an air shock always be rougher on small bumps?

Not saying they're wrong, and it sounds like their blind testing indicates riders can always tell a difference between air and coil. Just saying it doesn't make sense. Maybe pushing into a lip is a high shaft speed moment?

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Liked a comment on the item The 2018 U.S. Open of Mountain Biking Will Be Held at Killington, Vermont, Aug 1-5 10/11/2017 8:01 PM

Resurrect the Mount Snow NORBA DH course madness at Killington

Liked a comment on the item The 2018 U.S. Open of Mountain Biking Will Be Held at Killington, Vermont, Aug 1-5 10/11/2017 8:01 PM

Ski Slope FTW Boys

Added a comment about press release The 2018 U.S. Open of Mountain Biking Will Be Held at Killington, Vermont, Aug 1-5 10/11/2017 8:01 PM
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Clayton Harper, folks. Slow clap.

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Added a comment about video MUST-WATCH Vital RAW - Matt Orlando in the PNW 10/9/2017 11:15 AM
C138x104

Entertaining as always guys. I like how the fork and shock o-rings are bottomed in the photos.

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Added a comment about video Mach 10 in Queenstown with Eddie Masters and Dave McMillan 10/3/2017 7:11 PM
C138x104

Weirdest ender for an otherwise stellar video.

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Added a comment about video Long Live D1 - Whistler Updates a Classic Pro Line Trail 9/28/2017 3:35 PM
C138x104

That video was dumb.

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Added a comment about product review Best of Both Worlds? We Ride the New Leatt DBX 3.0 Convertible Helmet 9/27/2017 5:23 AM
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Looks great, too!

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Added a comment about feature CushCore Goes Plus Sized 9/22/2017 9:31 PM
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I think I speak for the whole Vital community when I say this is the Interbike announcement we've been waiting for all week.

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