High Performance Front Suspension For Harley Dyna Models

monotube1monotube2monotube3monotube4 has created a state of the art Fork Cartridge Kit designed to outperform everything on the market available for the Dyna. The new asymmetrical design places a preload adjuster over a progressive rate spring in one leg and an aluminum bodied, sealed cartridge damper on the other. The result is superior damping and ride control combined with tunable preload and a new benchmark for high performance suspension on the Dyna platform. Available in stock and lowered versions for 2006 -2014 Dyna applications. MSRP: $399.95. Visit your local dealer or .

15 Responses to “High Performance Front Suspension For Harley Dyna Models”

  1. 1 zac May 21st, 2014 at 8:36 am

    I think I recognize Paul Smith’s bike? Progressive did a great job on it!

  2. 2 May 21st, 2014 at 9:09 am

    Cool looking functional Dyna. The baby blue paint I can probably do without, though.

  3. 3 Dave Blevins May 21st, 2014 at 4:20 pm

    This looks interesting.

  4. 4 Septic the Sceptic May 21st, 2014 at 5:15 pm

    I can’t understand this fashion of having the handlebars above the top of the fairing.

  5. 5 May 21st, 2014 at 10:43 pm

    Zac, yup that’s Paul’s bike. We’re hoping he doesn’t want it back too soon!

    Denny, we just couldn’t do another black Dyna!

  6. 6 BIG DOUG May 22nd, 2014 at 1:44 am

    about time as the stock suspension is crap

  7. 7 Wilhelm May 22nd, 2014 at 6:24 am

    Correct me if I get the wrong end of the stick, but: One leg carries all the weight of the bike (only one spring), the other leg does all the damping work. The axle is bending upward under normal load, while on the rebound gets bent downward when the damper acts as a brake against the spring.
    I’ve seen this setup on mountain bike forks, where a massive top fork brace takes these loads. Even if the resulting (minute) tilting movements of the front wheel probably can be discounted, I sense a fatigue issue here in the long run.

  8. 8 Joshua May 22nd, 2014 at 6:29 am

    Baby blue & black is a cool mix for a retro look. Nice bike. Yes, the factory suspension is quite crap. May try this setup from Progressive.

  9. 9 Bud May 22nd, 2014 at 7:15 am

    @Progressive, any plans to do these for 39mm FXR’s and Dynas?

  10. 10 Jusmecuz May 22nd, 2014 at 10:46 am

    I sense a “fatigue” issue on the stock Dyna suspension…so this, especially coming from Progressive, will make for a hell of an upgrade – Thank you Progressive for showing some love to the Dyna!

  11. 11 justaguy May 22nd, 2014 at 1:35 pm

    This design of using each leg for a specific purpose started in motocross bikes.

    I don’t think that riding a heavyweight cruiser on the street will put anywhere near as much stress or wear and tear on the components compared to motocross bikes that are expected to routinely soak up what are truly massive jumps these days.

    This separation of ‘duties’ for each fork is the future of suspension as far as traditional forks are concerned.

  12. 12 May 22nd, 2014 at 2:12 pm


    Living room quarterbacking, huh? Here’s the deal, we do this for a living, suspension is our thing and we’ve considered every possible scenario. In fact, we’ve had a Dyna running data collection (including strain gauges) for several years and thousands of miles to prove out this style of suspension. Added bonus, Harley did it with baggers a few years back (crappy damper doomed it, though), sport bikes and more than a few race bikes also run an Asymmetrical setup. Axles all very much intact.

    Why do it this way? Couple of key reasons, stiction being the first. A single damper reduces the energy it takes to set the suspension in motion, thereby activating the front end earlier (over smaller bumps or what we call road noise). The critical driver for Asymmetrical suspension is the physical size of the damper. More volume and a larger piston surface mean lower internal pressure and a more controlled and better damped suspension. In this case it also allowed us to add a preload adjuster over the spring to fine tune ride quality.

    Does it work? Indeed it does. Butter smooth, with the opportunity to firm it up if a rider is looking for a sportbike feel. Can we do it in a 39mm fork? Absolutely not. There just isn’t enough room to make it happen, although we still manufacture twin cartridges for the smaller diameter forks.

    Wait until you see what we do with the new baggers!

  13. 13 May 22nd, 2014 at 5:48 pm

    @ Progressive, get away from the keyboard and get back to work on the 39mm forks anyway. We put a man on the moon and a space station in Australia, we (Progressive) can do this 😉

  14. 14 Iron Horse May 22nd, 2014 at 8:36 pm

    Thank you Progressive. I’ve been patiently waiting for this since I heard about it at J&P Cycles open house last year.

    Hey Progressive…how about a part number for both the FXDF and the FXDWG? I was just on your web site and didn’t see anything listed.

  15. 15 Dyna rider May 23rd, 2014 at 7:53 pm

    Iron horse, there’s no fat Bob application for these. The part number for the wide glide depends on the year, look up 31-2520 & 31-2521 or go to progressive’s website and search by make & model… I found it, you can find it.

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