LANCER
Serious Thumper Alliance Member
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Savage Beast Performance Parts
Posts: 10606
Oklahoma
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The term "progressive", refers to the type of spring. It is designed so that the first inch or two is compressed at a rate of (example) 115 pounds, and the rest of the compression is at 150 pounds per inch. The result is a nice smooth ride under normal conditions, but under harder riding/rough road/more load etc, you get the added support of a stiffer spring. "Dual-spring rate" is probably the way to say it.
I have been buying the "Progressive" brand of shocks. The are good quality and can be found on ebay at really good deals. The first I had was a 13.5" 412 model, and they worked very well...MUCH BETTER THAN STOCK shocks (retail for $200-300). I just got a set of 12.5" 418 model shocks (posted here) and will be putting them on today. These are a higher quality shock with more capability (retail for $400-500). Compared with the stock shocks, you will notice an IMMEDIATE improvement in ride and handling quality. I am 5'6 1/2", weigh 200+, and since I began using the Progressive shocks I have never had a bottom-out experience...and I had a lot with the stock shocks. As far as what shock length is best? That will depend on your preferences. I like a tall shock, because it will give more space under the fender...a little more shock travel...quicken front end handling because of the higher angle. With the 13.5" shocks I did have to remove the belt guard because it rubbed the front of it a little. With the 12.5" 418's I just got, I should be able to put it back on. As far as adjustment capability, the 412 model had only spring preload adjustment. The 418 model has spring preload and dampening/rebound adjustment capability. That is a significant difference, and that is the reason why I purchased the 418 model shocks.
Since I bought these shocks on ebay, slightly used, I do not know the exact spring rate for them yet, I will have to call the manufacturer for that info. I hope this has been helpful.
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