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Shop | Components | Cockpit | Boxcar Stem

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Boxcar Stem

The Boxcar Stem is the perfect combination of stiffness, strength and light weight.  Available in +/- 0^ in 35, 50, 70 and 90mm. Also +/- 15^ in 70 and 90mm, and +/- 7^ in 100 and 110mm. 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
    35mm +/-0: 118 g
    50mm +/-0: 137 g
    70mm +/-0: 153 g
    90mm +/-0: 155 g
    70mm +/-15: 169 g
    90mm +/-15: 172 g
    100mm +/-7: 181g
    110mm +/-7: 203 g
  • Material
    American Aerospace Aluminum
  • Finish
    Anodized or Polished
  • Anodized Color
    Black, Purple or Silver
  • Bar Clamp Diameter
    31.8 mm or 35.0
  • Lengths
    35mm
    50mm
    70mm
    90mm
    100mm
    110mm
  • Stem Angle (deg)
    35, 50, 70, 90mm: +/- 0
    100, 110mm: +/-7
    70, 90mm: +/- 15
  • S.H.I.S. Stem 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 strongest and highest quality American aerospace aluminum, 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.

The stems come in a zero rise and a +/- 15 degree rise, and in 100mm and 110mm length they are available in +/- 7 degree rise. Lengths are 35, 50, 70, 90, 100, and 110mm. 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.

 

 

Stay in Touch

Our monthly email is an ongoing bike conversation for creative people who spend a lot of time in their garage.
@sklarbikes is stepping UP! We’ll raise the ante @sklarbikes is stepping UP! We’ll raise the ante with a free Boxcar stem and a pair of Klamper brakes to whoever wins this bike: 

“🚨RAFFLE ALERT🚨 
Things have been feeling pretty dire lately, so I’ve been trying to figure out a way to at least feel helpful. This seems like a fun way to do it: our very first raffle.

Up for grabs is one custom steel bike frame. That’s a $3600 retail value, and raffle tickets are just $25 each. The more you buy, the more chances you have to win. This is probably also a good time to announce that I have no plans to take custom frame orders for at least the next two years, so hop on now if you’d like this one!”

100% of the proceeds will be split between the @SusanWicklandFund and @PlannedParenthood

The Susan Wickland Fund helps provide access to abortions, health care, and sex education to those who need it in Montana. Planned Parenthood is a national public health provider that ensures all people have access to the care and resources they need to make informed decisions about their bodies, their lives, and their futures.

Please buy as many tickets as you like. I have no plans to offer any custom frames for sale for at least the next two years, so this may be your last chance for a while!

Tickets available on the “Shop” at Sklarbikes.com, link in story/bio.

Winner will be announced July 22.

Thanks for helping out!
Love,
Adam
#sklarbikes “
35.0 Clamp? Yup, in 35 or 50mm length, machined fr 35.0 Clamp? Yup, in 35 or 50mm length, machined from the highest quality American 2024 right here in sunny Chico California by a bunch of bike nerds. ✌️
If you like hardtails, wild paint, swoopy lines, a If you like hardtails, wild paint, swoopy lines, and MUSA parts you’re gonna wanna head on over to #TheRadavist.com and point your eyeballs alllllll over this beauty! 👀👀👀
Did you know we make 44 different Boxcar stem vari Did you know we make 44 different Boxcar stem variations?! Everything from 35X0^ shorties to 110mmX7^, with 7/8”, 31.8, and 35.0 clamp diameters. Let’s see those #BoxcarViews! 
🎨: @l__ermitage
New part trays day! Mr Paul makes these in his woo New part trays day! Mr Paul makes these in his woodshop for transporting pieces to/from Ted The Polisher. After a few years they’ll have the nice patina of the ones in the last couple photos. 🪵
There’s just something about @l__ermitage playfu There’s just something about @l__ermitage playful art. If you ever need GIFS or logos, hit them up!
Paul Component Engineering
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  • 530–345–4371
  • 11204 Midway
  • Chico, CA 95928
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