According to the polaris online part numbers, the front of the 09 450 mxr is 120 long and 140 short. The 525 has a 180 short. all the long ones are the same for what i can find, for the front on all 08,09's
The rear of mine (08 525 SRA), IS 500 long one, 8.5" and the short one just says progressive.
The rear of the 09's 400 long, 600 short for the 450's
and the 525 SRA is shown at 400 long and 500 short.
Also this rear spring above #7043093-293 400 in lbs ,is tha same on the 05,06,07 predators.
specs on these are brought up when searching for the item and price on snows polaris web site.
Ummmm, So now that the data is here in front of us, maybe it can be used to help answer my question. My '05 TLD SRA rear shock seemed to be sprung about right for my weight and riding style. My '08 SRA 525 now seems too stiff. If I ride it REALLY aggressively and really punch the jumps, it responds OK, but most of the time it sits and rides too high, and bucks back badly when I am riding a more relaxed pace. I am assuming the spring rate is too high. Am I on the right track here?
SSJEFF, if it is too long, what do I do with it? I have heard of guys having them shortened 3/4 inch. Do they then use longer springs too? What if I could re-design the mount points to lower the back end? Would I then want a longer spring too? This stuff confuses me.
A bit of a correction on the IRS Outlaws.... The front & rear are not the same.
Fronts are part# 7043197 = 120 lb/in
The rears however, are a different part number - 7043133 - which it seems are often also used on the front of the straight axle quads... same length spring & same number of active coils with a slightly thicker wire.
Polaris doesn't list the rate... but comparing them to the 7043197 using a spring rate calculator it would seem they are around 135 lb/in.
#7043481 for the rear of the 09 is listed as 160 lb/in.
The 160 lb/in main spring for the 09 rears doesn't mean the 09 comes with a stiffer rear spring... in fact, the spring package for 09 is softer all the way around.... by a LOT.
The small secondary springs in 07 & 08 were there for no real reason other than to take up the slack so your adjusters couldn't move when the shock went to full extension if you weren't running any preload. They were always in full coil-bind. So the effective spring rate was the rate of the main springs.
Front = 120 lb/in
Rear = 135 lb/in (estimated)
2009 is a far different story... the small secondary springs (at least as listed by Polaris) have enough rate to become a factor. In fact, if you do the math....
Front = (120 x 180) / (120 + 180) = 72 lb/in
Rear = (160 x 160) / (160 + 160) = 80 lb/in
Would it be beneficial to take the springs off of my IRS front shocks which i have removed and replaced with Fox Podium's and swap them with the fox springs ?
what length shocksare say the 08 IRS? would it be wise to go a little longer to keep the ground clearance high even with a soft preload? igetthatrace quads turn/handle better w/ lower peg height, but i'ld rather have the ground clearance and softer, plush ride. any thoughts?
The 08's SRA'S are the same, the rears are 500, 8.5"
Have no idea what is meant by the short one, other than its a progressive spring. I might have my old one out in the garage yet, i'll have to get it checked.
Just for comparision, my rear now is a 300 8" main, along with a 900 tender
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