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Item # THP000A

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Item # THP000A

Description

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

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

Community & Reviews

Here's what others have to say...

5 5

Lovely.

  • Familiarity: I've used it several times

What else can I say? Thomson makes the highest quality parts for what ever kind of bike you are building. All of their stuff looks so good together. Extremely durable and still very light. Definitely worth it.

5 5

classy

  • Familiarity: I've put it through the wringer

After drooling over so many so many beautiful bikes clad in Thomson cockpit parts at the North American Handbuilt Bicycle Show (NAHBS), I had to have my own. The little ridges on the stem really add a nice detail to the overall presentation on your bike, and it is light as well. Few things class up a bike like Thomson.

5 5

Thomson X4 Stem
Thomson X4 Stem

  • Familiarity: I've put it through the wringer

Thomson is the state of the art in extruded aluminum - the quality and craftsmanship is top notch. Compared to the Enve stem on my other whip the Thomson stem feels stiffer and more precise while remaining comparable in weight. Not sure what I can add other than Thomson products are truly amazing!

4 5

Industry Standard

  • Familiarity: I've put it through the wringer

Thomson components have had a reputation of being some of the best in the business and this is no different. The quality and finish are excellent, and the stem is available in pretty much every length imaginable. I'm gonna knock it down one star because the bolts require a 3mm allen. I'm assuming this is to prevent over tightening, but from my perspective its just a total pain when i work on my bike considering I already have to use a 4mm and 5mm.

Avg. ride time: 2h 59m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.
5 5

The best for the 31.8 crowd.

  • Familiarity: I've put it through the wringer

I needed to change my position up on the new rig, and this thing is what the doctor ordered. Going back to 31.8 bars to save the hands after 35's beat me up all the time. This is the workhorse stem, and people will definitely nod in acknowledgement that you are running the best. This is probably my 7th or 8th Thomson stem in the last 7 years.

5 5

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.

5 5

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.

5 5

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.

5 5

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.

5 5

It's a thomson...

  • Familiarity: I've used it several times

I'm not sure what else to say that isn't known or said about Thomson...light, strong and beautiful. Hard to beat.

5 5

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.

5 5

Thomson, enough said

  • Familiarity: I've put it through the wringer

I love Thomson products they're well made and in the U.S.

5 5

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.

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..

Avg. ride time: 1h 55m 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 55m 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!
Avg. ride time: 11h 44m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.
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

X4 on the Cross.

Dressed up with the blue face kit. I just had to have it.

X4 on the Cross.
5 5

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.