Diamondback SeaHawk Frame - Silver - 21.125" TT - 100% Sanko Chromoly

Diamondback SeaHawk BMX frames are made from Japanese Sanko 4130 chromoly tubing. We chose these tubes because Japan is cool, and 4130 is code for the aircraft quality steel and “BMX.” Really: a million knuckle tattoos and twitter handles can’t be wrong. 4130 is BMX. Once the frame is completed we do a deep cleaning, throw the frames in an oven and then crank up the heat: 500°C for two hours. Then we dial it up to 850°C, where we cook these turkeys for two more hours. That’s hotter than summertime on Mercury. Mercury is in space, next to The Sun. The frames are then dunked in oil, cleaned again, and heated back up to 600°C. A controlled cool-off period sets the hardness in, and boom: a super solid frame, ready for abuse. We could talk about the yield strength of steel alloys, deflection, and tempering. But that’s boring. It’s way more fun to think about your frame being born on another planet. In space!

4 lbs . 7 oz. of fully heat-trated Sanko chromoly, Internal headset, Tapered chainstays, Intergrated seat post clamp, Removable Brake Bosses 

Original price was $350


  • Top tube length: 21.125”
  • Chain stay length: 13.7”
  • Head tube angle: 74.5º
  • Posted Weight: 4 lbs 7 oz
  • Color: Gloss Silver
  • Removable brake mounts

Related Items

Back to the top