Box One Top Load Stem (31.8mm Clamp) (Red) (48mm)

Read Reviews
Write a Review
Box One Top Load Stem (31.8mm Clamp) (Red) (48mm)
Out Of Stock Online
You may back order this item and it will ship when it arrives.
$1.99 flat rate shipping! Learn More
Price: $69.99


  • 48mm
  • 53mm

Please Log in to receive a notification when this item arrives in stock.

Save In List
This item earns up to 70 VIP Reward Points Learn More
The Box One Top Load is a modern, 31.8 Ø, oversize stem designed specifically for BMX racing. When used with our Box One Alloy Triple Taper Handlebar, or Box One Cro-mo Triple Taper handlebars, you get the absolute stiffest cockpit available. This added stiffness significantly improves bike handling while putting more upper body power into your pedal stroke, translating into more forward momentum. This isn’t just hype. Every rider we've worked with who have used the Box One Stems along with the Box One Handlebars has noticed a major improvement in stability and control. Box One Top Load stem bodies are cold-forged and CNC-machined from the highest quality 6061-T6 aluminum. The lightweight top clamps are cold-forged and CNC-machined for increased stiffness and strength.


  • Oversized stiff design
  • Oversized bar bore
  • Oversized Cro-Mo clamping bolt
  • Top load clamp design
  • CNC forged for superior strength

Size Clamp Material Process Rise Stack Height Steerer Tube Weight
48mm 31.8mm 6061-T6 Aluminum Cold Forged +/-5° 28mm 1-1/8" 9.3 oz
53mm 31.8mm 6061-T6 Aluminum Cold Forged +/-5° 28mm 1-1/8" 9.4 oz
60mm 31.8mm 6061-T6 Aluminum Cold Forged +/-5° 28mm 1-1/8" 9.9 oz


This product was added to our catalog on October 30, 2019

Friday, Jan 10 2020 (about 2 years ago)
Box One Top Load Stem (31.8mm Clamp) (Red) (53mm)
So ive had my bike for about 6 years so i figured id buy a couple parts to freshen it up, my bars were slipping back and for and i went with this stem to color match my bike, unfortunatly i didnt relize there were “over sized” clamps for oversized bars, i have sanded the inside of it to grip my bars but little did i know my bars are waaayy too skinny, just realy wish it wouldve been more clear on the product title that it was an abnormaly oversized part, never had any problems with customer service or order being messed up, i geuss ill take the blame for this one and buy another stem thats definatly not oversized