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thuren mikekazimer's article
Nov 12, 2018 at 9:48
50 mins
Review: Specialized Stumpjumper EVO 29
@jclnv: "That's just a side effect of wheelbase rather that specific head angle."........ I disagree... The slack head angle would surely keep you on track better, vs being jerked around with a steeper head angle. I like climbing with a slack head andle MUCH better than steep'ish.
thuren mikekazimer's article
Nov 5, 2018 at 12:46
Nov 5, 2018
thuren mikekazimer's article
Nov 5, 2018 at 10:30
Nov 5, 2018
Pinkbike Poll: Would You Rather Have an Air or Coil Sprung Shock on Your Trail Bike?
@DrPete: Another simple way to look at it.... No preload, you are asking the spring to compress 2".... Add .2" preload, you are asking the coil to now compress 2.2" total...
thuren mikekazimer's article
Nov 5, 2018 at 10:28
Nov 5, 2018
Pinkbike Poll: Would You Rather Have an Air or Coil Sprung Shock on Your Trail Bike?
@DrPete: Bottom out force is determined by spring rate, shock travel, AND any preload if any. So with no preload your math( 500 x 2 = 1000lbs bottom out force) is correct. Add 2 turns of preload, and you can add that force and add it on the tail end. Lets say 2 turns is 100lbs force..... That math would be 500 x 2 + 100 = 1100lb bottom out force...
thuren mikekazimer's article
Nov 5, 2018 at 8:41
Nov 5, 2018
Pinkbike Poll: Would You Rather Have an Air or Coil Sprung Shock on Your Trail Bike?
@DrPete: Rough numbers and lets say the curve is mostly linear... Lets say it takes the spring 375lbs force to hold you at 30% sag, with a 2.25" stroke shock, and a 500lb/inch coil with NO preload.... That is 1125lb force to bottom out that setting. Say you take the same coil and now crank in a few turns of preload to hold you at 20% sag. Same 375lb you are putting on the coil plus the force it takes to bottom from there. You now have 80% travel(1.8" shock stroke) to go to bottom out vs 70% travel(1.575" shock stroke) when at 30% sag. 20% sag setting will take about 1275lbs force to get to bottom out, vs 1125lb force at 30% sag.
thuren mikekazimer's article
Nov 5, 2018 at 6:55
Nov 5, 2018
Pinkbike Poll: Would You Rather Have an Air or Coil Sprung Shock on Your Trail Bike?
@GTscoob: Adding or removing preload changes the effective force it takes to get to sag, bottom out, etc. It's not changing the sprint "rate", but adding a little preload absolutely adds to the force it takes to bottom out.
thuren mikekazimer's article
Nov 2, 2018 at 14:22
Nov 2, 2018
Pinkbike Poll: Would You Rather Have an Air or Coil Sprung Shock on Your Trail Bike?
@zede: No you don't... Just add or remove a turn or so of preload... Even easier than getting out the shock pump.
thuren paulaston's article
Oct 25, 2018 at 12:28
Oct 25, 2018
Kurt Sorge's Polygon XQuareone DH - Red Bull Rampage 2018
@conv3rt: Thanks for the compliment!
thuren andy9's article
Oct 24, 2018 at 13:10
Oct 24, 2018
thuren mikelevy's article
Oct 24, 2018 at 7:40
Oct 24, 2018
Going Deep: Inside Fox's GRIP2 Damper
This system is super clever, as it is a TRUE HSR adjuster. Most everything was discussed in this article, but maybe TOO in depth, so many of you may not get the importance of WHY adjustable HSR is so important to have. High-speed-rebound is extremely important especially regarding the fork, compared to the rear shock. When the HSR is too slow to return as Levy discussed, you end up "packing up" through chundery repetitive hits. In other words, the first root you may hit feels fine, but as the tire moves closer up to the next obstacle, if the front tire did not shoot back down to the ground fast enough, your fork is already sitting deeper in the stiffer zone of the travel, and ALL the next quick hits after the first are going to feel STIFF. Same cycle over and over... The adjustable part of this is important as Levy notes, as a pro 200+lb rider may have 120psi in the fork, and a pro 130lb rider may have 70psi in the fork. Both riders need the fork to shoot back to the ground at the same speed. If the HSR is not adjustable and both riders are on the same fork tune, the 200+ lb pro may have a perfect/fast rebound speed, and the 130lb pro might be stuck with a fork that won't rebound/extend fast enough.
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