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Flyin' Miata frame rails v2.0

Flyin' Miata frame rails v2.0
Flyin' Miata frame rails v2.0
The original Miata frame rail reinforcements - and the most effective.

Made in the USA

Exclusive to Flyin' Miata

Availability: In stock



The original and the best frame rail reinforcements for the Miata.

First, why do you want chassis rigidity? Because a stiff structure allows the suspension to work better. If your chassis flexes, it's basically a big undamped spring that changes your suspension geometry under load and shudders every time you hit a bump. A stiff chassis will give your suspension a solid platform to work from, leading to better, more predictable handling as well as improved ride quality. There really is no downside. Chassis stiffness is usually measured as torsional rigidity - resistance to twist - because that's how loads usually travel through a car.

These braces slide over the factory frame rails and stiffen the car dramatically. The factory rails are easily damaged over bumps and mistakes when jacking, and every time they are bent the car gets floppier. When we tested these on a 2002 - the stiffest Miata that Mazda ever made without additional bracing - we saw chassis stiffness improve by 17.5%.

Ground clearance is unaffected and the total added weight to the car is 13.5 lbs. The rails and the fasteners are 14 gauge 304 stainless steel to prevent corrosion. They're strong enough to act as jacking points as well.
There have been multiple running changes to these since we first developed them in 2005. The big news for the version 2.0 set - the ones with Flyin' Miata cut through the sides - is compatibility with the latest generation of butterfly brace. They're also compatible with our older butterfly brace designs.

 To make your Miata even stiffer, we highly recommend our  butterfly brace. You can either get the full butterfly which includes frame rails, or you can add the butterfly portion later.
No welding is required for installation although 24 holes need to be drilled in the car. Fits all 1990-2000 cars as well as the 2001-02 cars without the Sport bracing. Sport cars and 2003-05 Miatas can use the braces although one of the factory cross bars has to be removed. The factory bar can be retained with a slight modification. If your factory rails have been damaged, they may need some massaging with a hammer to allow these to slip over top. 
There are less expensive knock-offs out there.  None have all the features of our originals, though, such as stainless steel construction and the cutouts for lower weight. Also, the FM rails are the only ones compatible with the acclaimed  butterfly brace upgrade.

Miatas are naturally the only thing we can guarantee fitment on. If you'd like to try them on a different car, the cross-section of the frame rails can't be bigger than 2.65" x 1.875". Our rails are 43" long (longest dimension). 

See an installation! One note about this video - the competitor product mentioned is made of mild steel with zinc coated fasteners so it'll be less corrosion resistant than our stainless items. Also, these rails survived multiple end-over-end rollovers on a previous car, then got reused.

Installation Video:

Additional Information

Additional Information

Part number 13-69011
Fits: 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1999, 2000, 2001, 2002, 2003, 2004 (non-MSM), 2005 (non-MSM), MSM
Manufacturer Flyin' Miata
Flyin' Miata exclusive Yes
Fits Exocet? No
Proposition 65 Warning: Cancer and reproductive harm
California emissions Emissions regulations do not apply

Customer Reviews 6 item(s)

Takes time to do it right
Sure you can drill some holes and bolt it down but IMO.......
Paint them, rustoleum hammered black works well
The outside lip is relatively flush with the floor pan, the other side is not. Use aluminum washers to fill the gaps where you drilled holes. One one the outside lip per hole between 1 and 4 on the inside.
Point bolts into passenger compartment. Buy 20 twenty mm and 4 25mm
Don't mount the gas and brake lines as shown. Use the brackets but drill a hole in the floor pan (6mm bolt) and mount there.
Por-15 all holes inside and out.
One man job. Definitely worth it.

Note from FM: the rails are stainless steel, so paint is not required for protection although black paint will make them less visible. If you point the bolts upward, you do run the risk of abrading through the carpet in the footwell as occupants rub against them.
Review by redmist / (Posted on 6/2/2020)
Frame rails for old racer
Stiffened up the floor to the point that the doors now fit better.
Review by Chip / (Posted on 1/18/2020)
Must buy
Incredible item. It drastically changed the rigidity of my car.
Review by Mzdaspd / (Posted on 10/29/2019)
Easy to do, definitely worth it
I installed these on a '91 NA with badly squashed frame rails. It took about an hour of hammer work to get the frame rails straight enough to begin the installation. The installation itself was pretty easy. I did it by myself over a few hours, which included adding some sound proofing to the floor pan. The main difference I noticed was more precise turn in and side-to-side transitions in winding roads. My car already has a roll bar and FM shock mount brace that helped to stiffen the chassis. These FM rails definitely added to the overall package. One tip - remove the protective plastic from the rails before installing them. I left it on to reduce scratching as I bolted them in. It is a real pain to get off after the rails are installed!
Review by Dennis / (Posted on 10/25/2019)
A worthwhile addition
I borrowed a younger friend's 11 yr old to be my assistant on the install. It would have taken forever by myself between short arms and old age. The rails are not marked so look at the pictures and get them right. It should be no problem if you pay attention to how they go. I have not beat on the car hard but when driving the 1/4 mile from my house to the highway up a rough caliche road, there is definitely a lot less body/fender shake and the car feels a lot tighter. I am very satisfied with the result. I did replace the two longer bolts on the passenger side inner rail ends as they were awfully close to the four fuel lines-so all my bolts on that rail inside were all short when I got through.
Review by Steve / (Posted on 8/28/2019)
Worth it.
Installed on a 94 NA 1.8 and made a significant difference in chassis rigidity and allowed the suspension to do it's job more effectively. Can not comment on the install as I had it professionally done. My vehicle is used primarily for trackdays and autocross.
Review by MrX / (Posted on 8/20/2019)
Click here for instructions for this part.

Why stop here? Consider this upgrade.