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Thomson Elite Stem X4 - Black

Thomson Elite Stem X4 - Black

Too many modern mountain bike stems sacrifice strength and torsional stiffness for a few grams of ...

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Evans Cycles UKThomson Elite Stem X4 Aluminium 40X31.8 Black
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FrasersThomson Elite Stem X4 Aluminium - Black - 90x31.8
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Leisure Lakes BikesThomson Elite X4 31.8mm Stem Black
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Sports Direct UKThomson Black Elite Stem X4 in Size 40x31.8, Sports Direct
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Product Information

Full details

The Thomson Elite Stem X4 is designed for mountain bikers, particularly enduro and downhill riders, who prioritize strength and stiffness without excessive weight. Its key benefit is enhanced steering precision and control, allowing riders to fully utilize stiffer forks and handlebars. A potential consideration is its focus on strength over ultralight construction, making it ideal for aggressive riding rather than pure weight-weenie builds. This stem is precision-machined from a single piece of 7000 series aluminum, offering exceptional durability and performance.

All features

Model Part Number875850006447
BrandThomson

Extended Product Information

FAQs

What is the primary benefit of the Thomson X4 stem?

The primary benefit is its exceptional strength and stiffness, which leads to more precise steering and improved control, especially during aggressive riding.

What size handlebars does the X4 stem accommodate?

The Thomson Elite Stem X4 is designed for 31.8mm diameter handlebars.

Is this stem suitable for lightweight XC builds?

While it's lighter than some previous Thomson models, its main focus is on strength. For ultralight XC racing where every gram counts, there might be lighter options, but the X4 offers a superior strength-to-weight ratio for demanding use.

Where is the Thomson X4 stem manufactured?

The Thomson X4 stem is precision-machined by Thomson in Macon, Georgia, USA.

What is the rise of this stem?

The Thomson Elite Stem X4 featured in this guide has a 0-degree rise.

How does the X4 compare to the Thomson Elite 25.4mm stem?

The X4 is stronger, stiffer, and approximately 30g lighter than the Thomson Elite 25.4mm mountain stem, while also accommodating larger 31.8mm handlebars.

Can I use this stem for downhill riding?

Yes, the Thomson X4 is built to the same standards as aerospace parts and is certified for MTB use, making it a confident choice for enduro and downhill riders due to its strength and stiffness.

Troubleshooting

Stem creaking or loosening

Re-torque steerer clamp bolts and handlebar faceplate bolts to the recommended specification, ensuring even tightening. Clean the steerer tube and handlebar surfaces before reinstallation.

Difficulty installing handlebars

Ensure the handlebar is centered and that the faceplate is correctly aligned. Do not force the handlebar into place. Check for any debris in the faceplate clamps.

Steering feels loose or imprecise

Check headset preload and ensure it is properly adjusted. Verify that all stem bolts are tightened to the correct torque.

Pros and Cons

Pros

  • Industry-leading strength and torsional stiffness.
  • Provides precise steering, tracking, and enhanced riding control.
  • Lighter than previous Thomson Elite models while offering superior performance.
  • Durable construction using high-quality 7000 series aluminum.
  • Knee-friendly design for added safety.
  • Machined to aerospace standards for ultimate reliability.

Cons

  • May not be the absolute lightest option for riders prioritizing grams above all else.
  • Limited rise options (0 degrees on this specific model).
  • Focus on strength might mean a slightly less compliant ride for some.
  • Availability of specific lengths and colors may vary.

Setup, Compatibility & Care

Setup:

  1. Ensure your steerer tube is clean and free of debris.
  2. Slide the stem onto the steerer tube, ensuring it is seated correctly.
  3. Install the top cap and preload the headset bearings according to your fork manufacturer's specifications.
  4. Loosely install the stem's steerer clamp bolts.
  5. Align the stem with your front wheel and tighten the steerer clamp bolts evenly to the manufacturer's recommended torque (typically 4-6 Nm).
  6. Install your 31.8mm handlebars into the faceplate clamps. Tighten the faceplate bolts evenly and in a crossing pattern to the recommended torque (typically 4-6 Nm).

Compatibility:

  • Handlebar Clamp Diameter: 31.8mm
  • Steerer Tube Diameter: Standard 1 1/8" (check specific model if unsure)
  • Riding Disciplines: All-around Mountain Biking, Enduro, Downhill, Cyclocross.

Care:

  • Periodically clean the stem with mild soap and water using a soft cloth. Avoid abrasive cleaners or solvents.
  • Regularly check all bolts for proper torque. Over-tightening can damage the stem or components, while under-tightening can lead to movement and potential failure.
  • Inspect the stem for any signs of damage, such as cracks or significant wear, especially after a crash. If damage is suspected, discontinue use immediately and have it inspected by a qualified mechanic.

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