7/8″ Boxcar Stem – Paul Component Engineering Skip to content

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Shop | Components | Cockpit | 7/8″ Boxcar Stem

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7/8″ Boxcar Stem

Our popular Boxcar Stem but with a 7/8″ handlebar clamp diameter in 50mm length, 0 degree rise. These are great for certain handlebars (many titanium and steel) with a 22.2mm (AKA 7/8″) clamp diameter. This stem is the perfect combination of stiffness, strength and light weight. All screws are high strength stainless steel with the popular T25 head. Made in Chico, California with American aerospace alloy.

$147.50 – $166.50

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Technical Information

  • Weight
    174g. including hardware
  • Material
    American Aerospace Aluminum
  • Finish
    Anodized or Polished
  • Anodized Color
    Black or Silver
  • Bar Clamp Diameter
    7/8" (22.2mm)
  • Length
    50mm
  • Stem Angle (deg)
    +/- 0
  • S.H.I.S. Steerer Clamp Diameter
    28.6 mm
  • Stack Height
    36 mm
  • Instructions
    Download
  • Torque Settings
    Steerer Tube: 5nm
    Faceplate: 4nm
  • Rise & Reach
    Download

Product Story

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 some 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 highest quality American aerospace alloy, 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.

This limited edition batch comes in a zero rise in 50mm length. All screws are the same pan head T25 Torx type screws in stainless steel. Why Torx? To encourage torque wrench usage and avoid strippage (People tend to overtighten faceplate bolts). Also the Torx head is wider, distributing stress better, and are the same wrench size as the ubiquitous rotor screws all makers use. Also SRAM has made a switch to T25 screw heads in almost all their products, which is a good sign.

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.

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We’re super lucky to have a network of great bik We’re super lucky to have a network of great bike paths in Chico, one of which follows an old railroad route and leads right to the back gate of our shop! Bike commuting is awesome, and we figured it was time for us to pitch in, so we adopted a little stretch of path, and we go and pick up all the trash every couple months. 🚮 Ding your bell if you see us out there! 🛎
We got a package in the mail from @alternativebike We got a package in the mail from @alternativebikeco the other day with these blasts from our past in the box. Back when Moon Units were smaller and had a more finicky pinch bolt, back when people bought brake lever extensions so you could use your brakes from your bar-ends, and back when instructions were rudimentary drawings and said things like: “Hey- Be cool to the ground.” Thanks for the trip down memory lane!
Mike P won the #SierraOddity, what a lucky devil! Mike P won the #SierraOddity, what a lucky devil! Thank you so much to everyone who contributed parts and labor to this project, and an even bigger thanks to everyone like Mike who were willing to chip in and support @camtborg and all the work THEY put into trail advocacy. Good feelings all around! Now then…what kind of bike should we build @sierranevada next year?…🤔
Mark and Calvin of @paragonmachine stopped by the Mark and Calvin of @paragonmachine stopped by the shop on their way up to Butte Meadows. It’s a long ride all uphill from here, but they brought plenty of bleach to drink, so they’ll be fine. Have fun dudes, great to see ya!
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Holy heck, our buddy Tyler over at @btchn.bikes ha Holy heck, our buddy Tyler over at @btchn.bikes has brewed up something wild yet again! Head directly over to #TheRadavist.com and put your peepers on the full gallery. 🤯 📷: @jadeelhardt
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