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I would put the money into premium shocks first. The cost of a decent seat will get you half way or better toward a pair of shocks, you're going to buy them eventually anyway. I'd be willing to bet your stock seat wont feel too bad after you soften the ride with some good shocks.
Seeing you do 90% two-up riding, I'd think your passenger would have a strong opinion on what mod should be done first. Is your passenger happy with the current passenger seat? I was pretty much forced to replace the stock seat quickly to keep the wife happy; she hated the stock passenger seat. I'd say the seat should be replaced first, to one that you both like (I went with a Mustang), and then get a riders backrest as quickly as you can after that.
She doesn't complain. But its funny when we stop, it takes her a few minutes to dismount. Getting old I guess. Incidently, she has a backrest. The biggest one I think. Took care of that first.
So far the score is;
4 votes seat
6 votes backrest (rider)
1 vote for shocks (It seems from ebay and classified here that many more people change SG shocks than RK)
Any other input?
The seat is immediate comfort and makes a drastic difference if you are uncomfortable.
The suspension will lead to better controll and you will both benefit from that. Do you feel that your safety is compromised because of the quality of your shocks?
I guess my question is which of those two troubles you the most
My first thought would be for the back rest, but if you plan on doing all you mentioned, it may be foolish to invest in a back rest that may or may not fit the seat you get in the future. If you didn't plan on a new seat later however, I'd go with the back rest. As others said, you'll be amazed how much the backrest will help you.
I would replace the seat, I have been through 3 different seats on my '10FLHTK, and ended with a custom memory foam one done in Sturgis. There are many options, but watch out who will take a seat back or not if you don't like it even after 1 ride. Harley dealers are usually pretty good about this, JP cycles and other places are not.
based on the last sentence, I do have a Mustang seat that is for a '09 and newer Road king for sale, let me know if you have interest, it's got 100mi on it, still in box, and no damage, would sell 1/2 price.
My first thought would be for the back rest, but if you plan on doing all you mentioned, it may be foolish to invest in a back rest that may or may not fit the seat you get in the future. If you didn't plan on a new seat later however, I'd go with the back rest. As others said, you'll be amazed how much the backrest will help you.
I agree with Oilcan. While the backrest is a nice addition, I would prefer that it matches the stitch pattern of the seat and will fit to the seat. Find a comfortable seat for you and yours and then add the backrest and shocks.
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