Paul Components Boxcar Stem, 31.8mm

Paul Components

138.00 $ 147.00


The Boxcar Stem is the perfect combination of stiffness, strength and light weight.

This stem was designed from the ground up to be stiff, strong and very light. We went through several design iterations and believe we’ve reached the best combination of these three principles. Extensive real world and machine testing have proven this to be one strong stem.

With respect to torsion, the rounded box shape is nearly 25% stiffer than the competition. As for strength, we ran it through 1,000,000 cycles of above normal use stress without a single problem. How’d we get it so light, while still being so strong? We started with obsessive computer design time, then took the strongest and highest quality alloy made (American 2024), and precision machined it to .002” tolerance (that’s really tight for a stem). We use over 20 different end mills, drills, saws and taps to make 1 stem.

As usual, by letting the function and material properties dictate the shape of the product, we have come up with another one of our often complimented and purposeful designs. Yes, it looks a little different, but with us there is always one good reason for this: to make it work as awesome as possible.

  • Screws are high strength stainless steel with the popular T25 head
  • Made with US sourced 2024 aircraft alloy
  • Material: American 2024 Aluminum
  • Finish/Color: Anodized Black or Polished Silver
  • S.H.I.S. Stem Clamp Diameter: 28.6mm
  • Bar Clamp Diameter: 31.8mm
  • Length: 35mm, 50mm, 70mm, or 90mm
  • Weight: 118g (35mm length)