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137 sw procross center shock spring change


I got one from cannon too. Real nice looking piece by the way. Looks stellar with my black grey combo. Just sending off my shocks to be revalved now and we should be golden. Cheers

Jester
 
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So i have here a hyperco 160lb spring along side a raptor tr spring. Doing some quick math on the final rate of the raptor i got 250lbs. So really what i see here is something quite similar to the oem cat stuff only they claim its a triple rate. (Thats a stretch). As a comparison i measured the hyperco and my calculations came out within 5lbs of their rating. I personally dont have this heavy front feeling on my LE 50th but to each their own. I like ski pressure for cornering. I have to actually dial transfer out of my sled as it wants to carry the skis quite often on most transfer position. That being said mine is a 129. I will likely try this raptor spring first as i do appreciate the softer initial. I realize you have tested the 160 cannon and by no means am i trying to debunk your findings. If i ran it i would have to run almost zero preload to suit my own personal needs. I don't want a teeter totter.
 
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Cat Spring I liked is 2704-229 which is rated at 160/260 but it also is a dual rate and will not fit the QS3 R since it is barrel shaped and will hit resevoir. That Raptor spring looks to be same way.
 
my 2$ on this spring topic:

'17 SW, LTX SE, skid shocks were upgraded to the same QS3 shock package as on the 50th. The center shock body did show wear on the threads to the shock body by the plastic transition collar between the two dual rate springs. I covered the threads with 3M electrical tape. After 1000 mi of riding I found the stock spring package to be generally on the soft side which is fine for a compliant ride. But when pushed hard you can easily crash through the tender spring and bottom easily which leads to the issue of the front shaft bending/breaking in the tunnel. You can help the spring by changing the compression control to #2 position (or #3 which is way to stiff) but ride quality does suffer.

Front ski pressure is moderate but this is subjective since I run the single kiel Cat ski with Snowtrackers and my limiter strap is pulled up to the third hole. But I will say that the rear suspension overall felt lacking. I'm pretty light at 170# fully dressed with gear and I found that I was always turning up the rear torsion springs to keep from bottoming. (For those of you who have not tried this, put a 2x4 under the front of your skid and watch how makes the skid react. Then do the same to the rear of the skid, under the rear axel).

After the 1000 mi I also removed the shock for inspection, the tape held up okay at best, but I did find additional wear on the shock body, wear on the threads and going through the (expensive) Kashima coating.

I now installed the 160# single rate spring from Cannondale. Immediate observation was that the when sitting on the level floor in the shop the rear skid felt Alive and active again, not sluggish and soft. Rear torsion spring cam went back to one and I hit the trail.

Immediately I felt the front of the sled was significantly lighter yet I didn't lose any ability to turn and carve on hard pack or powder. But on severe ice I did not have the turning ability I once had. When pushed hard the sled responded by riding better. I was not able to crash through the spring rate as I did with the stock spring set up.

With my limiter strap in the third hole the spanner nut is all the way out putting almost no preload on the spring. This was my starting point. I tightened it up during the day and found that it takes very small adjustments to achieve an effect. Overall this spring will make a difference in the overall chassis feel but I'm pretty light so when riding at normal trail speeds it is a bit on the firm side. BTW I'm back to running no preload at all.

I contacted Cannondale and shared my results. This spring does everything it should and better then the OEM set up. I did requested a lighter spring to try to help with the low speed harshness that a single rate spring can produce and I believe I will be happy with that set up.

On a side note, my SE came with front shock Fox rebound adjust only. Upon rebuild Cannondale found the overall condition of the shock was poor. We made two changes. One, he did a small modification to the valving. Two, I found that the stock spring rate on this shock is 130#. I have another set of QS3 shocks on my other sled and that spring is only 100# and that sled rides like butter. So we changed out the spring to 100# and it rides perfect.

So anyone out there with a SE package I highly recommend Contacting Cannondale about this set up for this shock, you will not be disappointed!
 
I'm back to the dual rate LE works best for me. Although my shocks aren't stock.
 
I'm back to the dual rate LE works best for me. Although my shocks aren't stock.
So what did you do? Exactly. Shim specs. If not willing to share info then you should pay to be a vendor or keep it to yourself. Sick of you commenting on all the shock posts without any real facts presented.
 
Didn't mean to ruffle any feathers cannon. Just posting my findings. I'm not here to steal your business either. Hope we can agree to disagree now and again without any reprocussions. If you want to pm me feel free my door is always open.
 


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