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Supercross BMX | SX250 - 33 Year Radaversary BMX Chassis

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Back in 1989, when we started Supercross BMX, the original frame was our 6-bar design. We used the 6-bar for over a decade on our Cro-mo and Aluminum BMX race Frames.


During the SX250's design process, the Steel Mills were limited on tube sizes. So to solve the issue of frame flex, we added additional triangulation. By lowering the first set of seat stays and adding the second set of stays, we increased rear-end rigidity. This produced a stiffer, faster-accelerating frame, that still rode smoother than other options on the market.

Since we discontinued the 6-bar rear end, we always get asked about doing a re-issue. In 2019, for our 30-year anniversary, we did a limited run of 6-Bar SX250's . But this was no old-school wall hanger. Rather an actual modern race frame with a retro aesthetic. We brought TANGE back on board to build a few more Prestige® Tubesets for the ultimate Retro Race bike. There were only 30 pcs of each size!

Since then, we've had a ton of people ask us to do it again. But this time, they wanted the 29" frame set.

Introducing the SX250 6 Bar Chassis Kit - A Reynolds Cro-mo version of our original 6 Bar frame in a 26" Pro! We're also bringing back the popular 24" Pro XL Cruiser.

Each chassis contains:

  • Supercross BMX SX250 Frame Reynolds® made of Butted Cold Drawn Cro-moly Steel

  • Heat Treated 4130 Seamless Cro-mo Supercross Pro Fork with Welded in Star Nut

  • Speedline Sealed bearing Campy Style Integrated Headset.

 

Want to watch a more in depth video on the tech behind the SX250? Click Here

You'll be getting all the goodies:

- Triple Butted Reynolds Tubing made of Butted Cold Drawn Cro-moly Steel

- Heat Treated 4130 Seamless Cro-mo Supercross Pro Fork with Welded in Star Nut

- Flared Seatmast

- Heat Treated Cro-mo Dropouts (CNC'd with the Supercross Logo and also weight on the back side.)  

The Serial Numbers on these are 25033 "6" for 26," and then 1-50 for the 50 Limited Edition Frames in the 26" Size.

"4" for the 24" and 1-50 for the 50 Limited Edition Frames in the 24" Size.

26" Frame Specs

24" Frame Specs


This is a complete chassis kit similar to how the VISION F1 is sold.

Purchase includes

  • frame
  • fork
  • headset for a full chassis that can be used as a base for a new or old build!

This frame accepts a 27.2 Post with a 28.6 seat clamp. 

Visit our Big Bike / Retro section to complete your bike!

It takes traditional 3/8" BMX axles. 110mm spacing rear and 100mm spacing front.

Check the "Specs" tab on the top right for the full lowdown!

We don't sell Factory Jerseys, but we do have "Radaversary" Jerseys with all kinds of other cool merch and gear on our Lifestyle page! Check it out, you will like what you see!


Customer Reviews

Based on 2 reviews
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M
MARK CASTRO
Best of the Best

Bill and the SuperCross crew always the best to work with. God Speed

A
Anthony Coveris
Nice and clean

Closest frame and forks to the ones in the 80’s! Welding looks great! Awesome!!