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who can read a shock dyno read out

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2.3K views 5 replies 6 participants last post by  KMac  
#1 ·
just got my forks and shock back from traxxion:)

this is for my 125 race bike, had them put their valves in the forks, and freshen the shock up. they sent me this shock dyno im not sure how to read it and if its good or bad.

can anyone help me

btw it sure is nice regreasing up all the shock and dog leg bearings on a bike that weighs 150 lbs fully wet!!

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#6 · (Edited)
This is a peak velocity chart, meaning the force measurements were taken at the peak velocity of the shock movement. There appears to be 5 different settings of some type for the same shock that are graphed. I don't know what "B" and "R" are, but those are what is varied between the different runs, although a couple of them seem to be repeat runs at the same settings. Maybe it's different valving they are trying to determine which valving to use for your application. In any case, the shock performance in the 0-5 in/sec velocity range (approximately) is going to be for the soft, easy bumps (slower shock travel), and 6-10 is going to be for the moderate (higher speed shock travel). It looks like compression force is on the top half of chart; rebound on the bottom. I would think the really harsh bumps, etc...are well above 10 in/sec travel speed.

Let's say for a gentle bump that would produce 3 in/sec shock travel, the shock would be experiencing a compressive force of about 80-120 lbs, and a rebound force of about 100-300 lbs. (That's a big range, based on the graph, but again I don't know what the "B" and "R" variables are.)

The charts shows that your shock is very linear (good thing) and that the rebound forces are greater for the same shock velocity than the compression forces. Compression to rebound ratio is about 1:2 to 1:2.5 depending on which rebound curve you look at. (I threw out the extreme one on the low end)

I'm assuming that the 3.18Hz frequency they show is the frequency they cycle the shock at during the dyno testing. I would suspect they have determined that is a good, realistic range for normal shock operation (compressing and rebounding in approximately .3 seconds).