Progressive (brand) Springs Heads-Up for Anyone Thinking About Getting Them

[threejagsteve]

FYI:

Progressive specifies their part no. 11-1126 fork springs for FJs. It has been mentioned that these might be a bit on the weak side. According to their website they have a rate of 0.63-0.89 kg/mm. They require you to cut a 2-1/4 in. spacer for each spring.

The http://www.racetech.com spring rate calculator for street riding an FJ gives a recommended rate of 1.07 kg/mm for me, a 185-lb. rider.

Progressive also makes a set, part no. 11-1122, with the same diameter as 11-1126 and a rate of 0.80/1.25 kg/mm. These springs are 2 in. longer than 11-1126s, so would only need a 1/4-in. spacer if you wanted to retain full preload adjustment or could get by with no spacer if you put your adjustable preload on the #3 or #4 setting (I didn't measure them when my fork caps were off, but by eyeball one of those two should be real close to 1/4 in.).

I might add that I've just installed a pair of 11-1126s and have found them to be a decided improvement over stock, but I haven't done sag numbers yet and they may not be the optimal solution short of going to cartridge emulators.

Just food for thought...

Cheers,
threejagsteve

[thuber3040]

When I had my last 85 FJ back 1000 years ago, I installed the 1126 springs with a 2" spacer as I recall, and they were a major improvement against nosedive and handling, I think I had changed to 15w oil also
I weighed 265 back then. more now so I will have to do some shopping again.

[andyoutandabout]

I put in some traxxion dynamics springs and I think they work a treat. They are a couple of inches shorter than stock - I just measured the difference and made a spacer out of plastic tubing though they did supply metal tubes - I couldn't cut them properly. The people I spoke to on the phone knew what weight was needed - I don't recall. The price was just over $100, delivery was prompt - installation time consuming but easy enuff. Two years later things are going strong.
Andy

[racerman_27410]

For the straight rate springs anywhere from .95 to 1.10kg will work just fine.

most install the 1.05kg springs IIRC


Kookaloo!

Frank