Supercross BMX | SX450 - UL Edition Cro-mo BMX Race Frame

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Steel is real!! Don't Believe? The SX450 proves it!

You have to know your history, and pay respect to your roots. BMX started decades ago on modified Schwinn Sting -Rays® which were hi tensile steel, brazed and mig welded. Basically death traps by today’s standards. A few BMX dads started to modify these old bikes, and a few even decided to start using Cro-mo tubing that they had been using for their race cars and dragsters. With that the first modern BMX Frame was born.

Now with Supercross, we didn’t build the first modern BMX race frame, heck I don’t think we were even in the first 50 BMX Brands to build frames, but when we did start, we built Cro-mo , which 30 years ago was the best at the time. And the new Supercross UL450 pays tribute to that.

Unlike all the other company’s that are building Modern Retro bikes, or tribute bikes, the SX450 is built to ride. And you will want to ride it alot. Hell, Bubba nicknamed his the  "fun machine" and we think you will feel the same way too.

It is classic in the form that it built from Steel ( Air Hardened Triple Butted Cro-mo to be exact ), and it is Triple Show Chrome Plated, ( got to love Chrome right? ) and it has a Retro style inspired graphic. But that is where the Retro, or Tribute style ends. After that it is all modern, and probably, if not definitely the most advanced Cro-mo race frame available.

It starts out with a full CNC machined Campy integrated head tube, a Tange Prestige, double / triple butted air hardened Cro-mo tube set, a Butted and tapered seatmast , a CNC’d Euro BB shell, tapered and butted seat stays and chain stays, and back side CNC’d laser cut dropouts w/ 10mm slots welded on to the cut and capped stay ends.

The 450UL uses the old school style "S" bend Chainstays of the the original SX250, to keep it unique to this production run, and keep the BB stiff for fast starts.

And of course what would all of this Cro-mo goodness be with out a full race pedigree so we build it up in our world famous and World Championship winning, Supercross geometry of the ENVY and ENVY BLK race frames.

The Supercross UL450 is a limited production, a total of 30 pcs ( for our 30 year anniversary ) of each size. So you may want to get yours today as we are sure they are going to fly off the dealers shelves as fast as they are on the track.

Please note this is sold as frame only. The Matching Supercross SLT forks are available by clicking here.

Please join the Supercross BMX Riders Group on Facebook and show off your new SX450 - Post up pics of your build and share your serial # - we would love to create a registry for everyone to keep track of these limited edition builds.


Supercross BMX SX450 Triple Butted Cro-mo Frame Geometry Chart

Size A B C D E Seat Post Size Required Fork Type Wheel Size
Pro XL 21.25" 15.2" 74.5º 70º 11.6" 27.2mm 1 1/8" Threadless 20 X 1.75
Pro XXL 21.75" 15.2" 74.5º 70º 11.6" 27.2mm 1 1/8" Threadless 20 X 1.75
Pro XXXL 22.25" 15.2" 74.5º 70º 11.6" 27.2mm 1 1/8" Threadless 20 X 1.75
Pro XL 24" 22" 15.3" 73.5º 70º 11.6" 27.2mm 1 1/8" Threadless 24 X 1.75

* Specifications will vary depending upon your choice of Fork, Tire and Rim selection. Measurements are based off of a Supercross Fork and equal size (ie. 20 X 1.75 front and rear) tire combination. Specifications subject to change without notice.


All weights are measured on a UPS Calibrated Scale. Weights will vary depending upon the amount of powdercoat and the amount of filler rod used on a particular frame. Polished Frames and Anodized Frames are the lightest as there is no paint. Weights and Specifications are subject to change without notice.


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