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Old 10-11-2019, 12:57 PM   #11
busdriver
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Re: zx6r shock setup on Gen 2

The stock zx6r rear spring is very stiff. If my google-fu is good, it's 10kg/mm or about 560 lbs/in.
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Old 10-11-2019, 01:33 PM   #12
thedrewski86
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Re: zx6r shock setup on Gen 2

busdriver
that is a spec I'm trying to nail down too. According to RaceTech's site the '09zx6r spring rate is 9.2kg/mm (sounds close to your number) and according to this thread I should be dang near that range with my fluctuating weight. Or at least between 8.95kg and 9.4kg/mm

Your point is well taken though, the zx6r IS stiff compared to my stock pogo stick at 7.697kg/mm. I am of course basing this all off of these interweb resources and I wouldn't mind getting confirmation from someone. I myself found the 9.2kg number for this zx6r spring and you found 10kg... which is a considerable difference in actuality! That leaves me wondering what I really have.

Thanks for google-checking me, my google-fu may not match your google-fu
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Old 10-11-2019, 04:04 PM   #13
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Re: zx6r shock setup on Gen 2

I pulled the 10kg/mm number from the racetech website. Racetech also recommends a much softer rear spring than Penske. I suspect the Penske numbers are meant for a competent racer.

I'm about 180 before putting on gear, I'm an intermediate track day guy, not a competent racer. I have a 8kg/mm / 450 lbs/in spring on the back end of the track bike.

Edit to add: I had a ZX-6R shock on the rear to hold me over while I was getting the Ohlins rebuilt. 2006 I think. In any event it was way too stiff for the pace I'm riding.
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Old 10-12-2019, 09:36 AM   #14
thedrewski86
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Re: zx6r shock setup on Gen 2

That's very good frame of reference right there, and really the info I was looking for. I suspected this shock was just wrong from the outset so I'm pretty sure a RaceTech trip is in order next week.

Good news is I have almost no money invested in that rear suspension, just time. I had to replace it anyway since the stock shock blew out on my commute. Now that this bike is moving from 99% commuter to 100% fun canyon bike I need to get these things in order.
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Old 10-14-2019, 05:29 PM   #15
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Re: zx6r shock setup on Gen 2

Quote:
Originally Posted by thedrewski86 View Post
That right there is why I went with the 70 in the first place. I figured it would even out the taller rear shock. While I'm sure it did, I found that I didn't care for the 70 profile when I was doing my parking lot practice sessions (figure 8s, tight weaves, u turns in the box etc.) When I went back to the 60 the bike seemed to "work" again. While the 70 handled better on the highway at 80mph I found it handled worse in the parking lot at 8mph. Since I quit commuting with this bike I'm more interested in the latter.

That's my long winded way of agreeing with your point!
between the two, did you adjust ride height on either end to maintain the same trail with the two front tires?

if changing nothing else, it'll turn in faster with the 60 than the 70... but it won't have as much edge grip, the profile is lazier, there's a higher chance of denting a rim, etc.

you need more rear ride height with the 70.
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