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Item # THP000A

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Item # THP000A

Lightweight.

The Thomson X4 Stem utilizes a more traditional split clamp design to save weight without sacrificing stability and control. The X4 features a sculpted stem, sleek clamp bolts, and is made with 7000-series aluminum alloy to ensure torsional stiffness and precise steering. The X4 Stem comes with a 3-year warranty from the manufacturer. The stem is available in Black or Silver with a zero (90) or 10-degree (100) rise.

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

Tech Specs

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

Reviews & Community

REVIEWS

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Bike jewelry--get some

  • Familiarity: I've put it through the wringer

I've purchased more than a dozen Thomson stems over the years. The X4 is the workhorse mountain bike stem. It just oozes quality, fit, finish. Never had one fail (full disclosure--never had any stem fail). They are light enough, look great and with choice of zero or 10 degree rise, you're almost always certain to get the cockpit dialed where you want it. If you're into color coordinated bling for your bike, look for the colored faceplates (purchase separately) that are available to dress up your ride even more.

Thomson...nuff said

  • Familiarity: I've put it through the wringer

Thomson make best stem I've used so far and I have one on all my bikes. This is a set and forget component on your bike. Beautiful craftsmanship by Thomson. I've beaten it up either fully rigid or suspension and it keeps ticking. Mountain or road you probably cant go any better for performance and price.

What These Guys Said

  • Familiarity: I've put it through the wringer

I think we've covered it: light, stiff and gorgeous. Just make sure you hit those bolts with a torque wrench! Seen a few broken face plates over the years from over torquing. There is no need for silverbacking those bolts on a stem this precise and refined.

Tried and True

  • Familiarity: I've put it through the wringer

What can you say about the Thomson X4 stem. It's an extremely reliable high quality stem. Any bike I've ever had, has immediately been changed to a Thomson stem.

The Benchmark

  • Familiarity: I've put it through the wringer

It's not the only stem worth running, but you won't find one that's better. Light, stiff, burly, elegant, plenty of sizes -- there's not much to dislike about the X4.

Avg. ride time: 1h 11m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

On every mountain bike

  • Familiarity: I've put it through the wringer

This stem ends up on every mountain bike I own. It's brilliant. Stiff and light, doesn't slip.

Avg. ride time: 1h 9m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Thomson X2 100mm Zero rise

SSCX

Thomson X2 100mm Zero rise
Avg. ride time: 1h 9m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

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!

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

Yes.

  • 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.