Product Announcement: Medieval-Pro Torsion Bars Now Available

The torsion bar front end of a Honda Civic/CRX from 84-87 or Acura Integra from 86-89 is one of the more widely misunderstood components on these unique Honda models. But what generally isn’t misunderstood is that you want larger ones if your car has any sporting pretense.

The torsion bars are these cars’ front springs, supporting each corner of the car. They function as front springs but work a lot like sway bars. In these Hondas, splined bars connect a free-floating front control arm to the subframe via an adjustable “torsion tube.” Stock bars are around 17-19mm in diameter. The size relates directly to how “stiff” the suspension is.

For many years, a company in Los Angeles called Upgrade Motoring produced torsion bars, which Heeltoe had sold under our in-house label “Medieval-Pro.” However, in 2016, the supply of these bars began to fade. The pricing continued to rise and customers were unable to afford them any longer. In January 2017, Upgrade Motoring announced they could no longer produce torsion bars.

This sad day came just around the time that Heeltoe has decided to combat the rising prices by producing bars through another manufacturer. One was found and the second generation of Medieval-Pro Torsion bars are here!

Currently, Heeltoe offers bars in 24, 27, and 30 mm diameters, in CRX lengths. New circlips and snap rings are included.

Astute readers will know that some Civics actually come with a shorter torsion bar than the CRX does and that the Integra bars are nearly 1″ longer. Due to current production and demand limitations, Heeltoe is only producing CRX-length bars at this time. The good news is, any of these cars can use the CRX bars. If you have Civic tubes, the CRX bars will stick out the back slightly, which is not a functional problem. You will need CRX torsion tubes if you have an Integra, which can be found at junk yards and the like. For evidence, find this link: Integra Torsion Bar Installation

Keep in mind, the change in length from an Integra or Civic bar will also change the wheel rate. To make sure you are selecting the right bar for your application, find our Honda Torsion Bar Wheel Rate Guide here.

Shop For Medieval-Pro Torsion Bars Here: Medieval-Pro Torsion Bars

Chassis Heeltoe Explains

Tech: What’s the Spring Rate of my Torsion Bars? #torsionbarhondas Content Inside!

1984-87 Honda Civic/CRX and 1986-89 Acura Integra models came with a unique torsion-bar front suspension. Because of the non-conventional nature of a torsion bar as compared to a coil spring, people at times become lost on what various bars’ diameters equate to what would be conventional spring rates. This is an important figure for determining the balance of the car and for tuning the dampers.

Between the various diameters and lengths of bars available, we were a bit lost on it ourselves, but a little poking around led us to Sway-Away’s website. As some may know, Sway-Away is one of the foremost torsion-bar producers having even produced bars for said Hondas at one point in history. We knew this convenient calculator was something we could trust!

On the page there you will find the science behind the torsion bar wheel rate calculation. You’ll also see that the effective wheel rate is the same as the spring rate taken at the end of the control arm, or what is actually the lever on which the wheel’s movement acts.

You can play with it all you like, but we have taken the liberty of making a quick chart for fast approximate reference. Some of our dimensions are approximate but the spring rates should be accurate within about 5-10% and that’s really pretty good for our purposes.


  • LCA stands for “lower control arm.” Since people tune both Integras and Civic/CRX models, and sometimes Civic/CRX people put the longer Integra lower arms in their car to increase camber, we include both here. We approximate a 13.5″ length on the Civic/CRX and 14.5″ on the Integra, from the center of the torsion bar to the end of the ball joint.
  • All rates are in pounds per inch of travel (lb/in), but we have a lb/in to kgf/mm charge just below.
  • Not all these torsion bar diameters are actually available, but we are listing them anyway since any of them technically could be made or exist.
  • The bar length will impact the wheel rate, too. The 24.3″ bar is the length of CRX and many Civic bars. Some Civics have a bar that is about 1/3″ shorter, but the rate change is fairly minor so we have omitted it to keep the chart simpler. The Mugen bars that were made long ago were shorter than the Civic/CRX ones, with an overall length of just under 22.5″. These would give the highest rate per diameter, and being the more compact bar would have the least weight (no surprise that the Mugen bar would be the ideal for performance yielding the most rate-per-weight!).

We work on Japanese cars at Heeltoe here, and oftentimes it becomes necessary to work in both lbs/in and kgf/mm (that’s kilogram of force per millimeter). They are different ways of saying the same thing about a spring’s rate, but we’ve offered this handy conversion chart for you to know the equivalents. This info is pulled from’s Standardized Spring chart.


Please feel free to leave any commentary or calls for correction below! And never forget that Heeltoe is always in your corner, aiming to provide the best and most accurate info we can to help you tune your car!

Universal Fit Blogging

Team Why-49 & The Curse of Y-49 : A History Lesson

Surfing on Facebook earlier this Throwback Thursday, I happened upon a post of a CRX for sale which was Y-49 in color. The vehicle was in a bit of poor state, which triggered a chill up my spine…further evidence the curse of Y-49 is still true to this day.

Naturally, I shared it on my Facebook wall.

In the comments, you will find the startling question in reply to my statement that the curse was alive and well: “How so? Are the yellow ones all cursed?”

Clearly, the seller deliriously citing “Y-49 original yellow paint” and “Body is straight” as “pros” indicates he is feeling the dreadful after-effects of the Y-49 paint. They are selling the car after only a few weeks of ownership. I mean, look at this poor thing:

How sad. But this is really just one in a string of long-cursed applications of Y-49. Unfortunate VINs of yore cursed with this hue, 3rd generation Preludes and 2nd generation CRXs have suffered untimely, sometimes inexplicable, always un-Honda-like, fates. So much so, it was documented on an old Geocities domain from a group dubbing themselves “Team Why-49.”

Sidebar: if you are under the age of 31, sidebar. (?) I lost you @Geocities. Frst, WHT was Geocities? Linkup: Wikipedia, y0! (because no matter how much your teacher will not think Wikipedia legit, it mostly is).

Back to our story… with a little Googleing I came across a Honda-Tech post linking me to the original page! Here is an actual link to the Geocities page, which, even though Geocities closed in 2009, is still alive today!

Ok, apparently Yahoo! does have a pretty good sense of humor.

Team Y-49 was a sub-set of Y-49 vehicle owners who were part of which was probably the next-best, long-lasting CRX website after the CRX Resource* took a dump (although I personally preferred This group made a site that WAS hosted on Geocities, but since that was taken down the page was emulated here:

On it, there are the main member’s cars, a bunch of other people’s submissions, and what was called a “Guest Book,” which on websites back in the day was a place where people could post up their own contributions to the site. I’ll leave the challenge of digging into this site to yourself.

Warning, it is not likely going to resolve well on a phone, since these phones were “the shit” when this site was a known reference:

I will give you this little navigation tip:

So there you have it. A little background on the curse of the Y-49. Don’t own a car that is painted Y-49. And if you do, sell it or be prepared to share your story in our comments!

PS: If you choose not to believe any of this, consider yourself fortunate, as you have not be impacted by the curse yourself, as I have.

Getcha Y-49 T-shirts!

* Hey! is still active, but, not CRXy anymore…last updated 2008