Bike Stems
Strong but lightweight, Thomson stems create the ultimate riding experience. Bike stems are available for mountain, gravel, road, and BMX.
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Elite 31.8mm X4 Stems
Price range: $121.95 through $134.95 View Product -
G2, 31.8mm Road & Gravel Stems
$151.95 View Product -
Elite 35mm X4 Stems
$121.95 View Product -
BMX Stems
Price range: $121.95 through $131.95 View Product -
Direct Mount Stem
$121.95 View Product -
Stem Replacement Clamps
Price range: $14.95 through $39.95 View Product -
31.8mm X4 Dress Up Kit
Price range: $42.95 through $55.00 View Product -
Stem Top Caps
Price range: $9.95 through $14.95 View Product
Bike Stems Built to Perform
From the trails to the tarmac, Thomson stems are precision-engineered to deliver unmatched control, strength, and ride quality. Built in the USA from aerospace-grade aluminum, each stem is a reflection of our commitment to performance and craftsmanship.
How to Choose Your Bike Stem
Choosing the right bike stem comes down to your riding style. Shorter stems (around 40–60mm) offer quicker handling and a more upright riding position, ideal for mountain bikers and technical terrain. Longer stems (90–130mm) provide more stability and a stretched-out fit, preferred for road and gravel riding. You’ll also want to match your handlebar clamp diameter, typically 31.8mm or 35mm, and make sure your stem fits your steerer tube, which is usually 1 1/8″. Finally, consider the angle of the stem to adjust your bar height: positive angles raise your cockpit, while negative angles lower it for a more aggressive setup.
Build Your Dream Bike
Mountain Bikes
Match your X4 or Direct Mount with our Elite 35mm riser bars and Elite dropper post.
Shop NowGravel Bikes
Pair a G2 stem with Thomson carbon handlebars and an Elite seatpost for an all-day machine.
Shop NowTrack Bikes
Go full performance with a G2 stem, titanium bolts, carbon fiber bars, and a Masterpiece post.
Shop NowFAQ
Hear From Our Riders
Made in the USA
Every bicycle stem is machined, inspected, and tested in our U.S. facility with aerospace-level precision. American-made quality, trusted worldwide. For over 25 years, we’ve designed and built components that serious riders trust. Known for our seatposts, stems, and handlebars, we’ve earned a reputation for uncompromising quality and real-world performance. From local trailheads to global race circuits, Thomson components are there, not because they’re flashy, but because they work.