The ISC bar comes with compleatly re-positioned swaybar arm brackets that are at a different water line and for/aft position and that are for/aft adjustable as to where the bar mounts to the chassis with optional positions to mount the pillow ball bushing. With a thick radiator however it would be difficult to use the softest hole without coming up with a creative way to mount the end link I think.

http://www.iscracing.net/miatasuspension.html

 

Not trying to step on Emilio's toes but I did find another rear swaybar option. Suspension Techniques makes a 14mm 3 way adjustable rear swaybar listed for the 99-05 models-part# 51177.

I also confirmed with a box end wrench that the Eibach Spec Miata rear bar is 15mm.

 

We tested the ST rear bar. One hole can't be used due to the angle it creates with the end link. The bushings that come with it don't fit a Miata at all or the bar very well. ST was bought by another company so any of the ST bars are old stock, no longer in production. Green PC underneath, a different color painted over that (new owner of ST). For now, the MSM bar is a bit more useful. But yes, the 51177 is indeed 14mm.

We're working on our own sway bars but they're still many months away. Nothing revolutionary. Just a bit better adjustability, lower bushing friction and a bit less expensive than current options. Plus they'll be orange.

 

Glad my build has a lax finish date. Defiantly holding out for these! Love how Orange is noted plus. LOL

 

Tell me you're gonna do delrin, brass or bearing centers and have slide adjustable outside. I have been waiting for that! Way to much stiction with the current design.

 

Yea urethane bushing just plain suck for anything that is suppose to pivot freely. They suck even more with the big diameters involved with hollow bars.

 

Acetal (not Dupont Delrin brand) will be an option on our bars due at the end of the year.

Urethane works fine if it's installed properly. Yes it will have more friction than an actual metal bearing but they work, are much lighter and less expensive. For 90% of the owners out there, urethane is still the best option. Acetal bushings generate a huge increase in NVH that most users will not tolerate for daily driving. So no, they don't "suck" for the average guy Bob. Your car is a 99.9th percentile build so what meets your minimum requirements isn't always relevant to the average HPDE guy.

The OEM Racing Beat bushings are made by Prothane in Costa Mesa, CA. They are an imperfect design. I have hesitated to help RB refine their design and propagate those specs to Prothane because.. we will just fix those minor issues with our SuperMiata bars and offer an acetal option.

For those with RB bushings, it's simple. Put a washer under the front brackets to reduce preload and grease the heck out of them. Done so, and re-greased periodically, the breakaway and turning torque required is minimal. Good enough to win a pile of national championships with

 

This. Did this years ago, couldn't believe they designed it like this. Suspension binding sucks, unless you want random and hidden spring rates.

 

Saving my pennies now...car was lacking a little orange underneath anyways.

 

Acetal bushings AND 949 spec sway bars!?!

 

I don't know Andrew, an 1/8" hollow bar seems kind of small