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Item # THP000A

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  • Black, 0Deg/100mm ($99.95)
  • Black, 0Deg/110mm ($99.95)
  • Black, 0Deg/120mm ($99.95)
  • Black, 0Deg/130mm ($99.95)
  • Black, 0Deg/50mm ($99.95)
  • Black, 0Deg/70mm ($99.95)
  • Black, 0Deg/90mm ($99.95)
  • Black, 10Deg/100mm ($99.95)
  • Black, 10Deg/110mm ($99.95)
  • Black, 10Deg/120mm ($99.95)
  • Black, 10Deg/130mm ($99.95)
  • Black, 10Deg/90mm ($99.95)
  • Silver, 0Deg/100mm ($99.95)
  • Silver, 0Deg/110mm ($99.95)
  • Silver, 0Deg/120mm ($99.95)
  • Silver, 0Deg/130mm ($99.95)
  • Silver, 0Deg/50mm ($99.95)
  • Silver, 0Deg/70mm ($99.95)
  • Silver, 0Deg/90mm ($99.95)
  • Silver, 10Deg/100mm ($99.95)
  • Silver, 10Deg/110mm ($99.95)
  • Silver, 10Deg/120mm ($99.95)
  • Silver, 10Deg/130mm ($99.95)
  • Silver, 10Deg/90mm ($99.95)
  • Black, 0Deg/40mm ($99.95)
  • Black, 0Deg/60mm ($99.95)
  • Black, 0Deg/80mm ($99.95)
  • Black, 10Deg/80mm ($99.95)
  • Silver, 0Deg/40mm ($99.95)
  • Silver, 0Deg/60mm ($99.95)
  • Silver, 0Deg/80mm ($99.95)
  • Silver, 10Deg/80mm ($99.95)
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Item # THP000A


The Thomson X4 Stem drops weight by using a more traditional split clamp for the steerer interface, rather than an internal wedge. The sculpted stem relies on sleek clamp bolts, and, true to Thomson's design ethos, the X4 is CNC machined from 7000 series aluminum alloy.

The stem has a 31.8mm clamp diameter and comes in Black or Silver. The Thomson X4 Stem is available with a zero- (90) or 10-degree (100) rise, with lengths ranging from 50mm to 130mm.

  • 7000-series aluminum
  • Sculpted stem and sleek clamp bolts
  • Split clamp design
  • 31.8mm clamp diameter

Tech Specs

Claimed Weight:
[0-deg/50mm] 167 g
Steer Tube Diameter:
1.125 in
Clamp Diameter:
31.8 mm
Bar Attachment:
4-bolt faceplate
10 deg, 0 deg
50 mm 70 mm, 90 mm 100 mm, 110 mm 120 mm, 130 mm
Recommended Use:
cross country, freeride
Manufacturer Warranty:
3 years

Reviews & Community

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Thomson X4 Stem

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Here's what others have to say...

5 5

No surprise here

  • Familiarity: I've put it through the wringer

Excellent as usual from Thomson... All my bikes have Thomson Post and Stem..

Works great for a road bike too!

To get my desired drop, I needed a zero rise stem, and Thomson fit the bill. There aren't many zero stems out there.

Works great for a road bike too!
4 5

Solid, expensive for weight

  • Familiarity: I've used it several times

Thomson x4 stem is very solid, great materials, great construction, looks good, and has +/-10 which fit my needs perfectly. my only gripe would be that the stem is a little on the heavy side given the price point. there are many alternatives to the Thomson x4 stem that cost 1/2 the price and accomplish the same task, so you are definitely paying extra for the Thomson brand. most of the time I would be bothered by that, but not as much here, given that this stem definitely delivers on its quality focus and offers the steeper angle (-10) that many others don't.

Solid, expensive for weight
5 5


  • Familiarity: I've put it through the wringer

Thomson, made in the good ol' US of A. Over the years I've had everything from a 50mm up to a 120mm on my rides. They are so good, I just can't seem to quit them.