Thomson X4 Alloy Stem
The Thomson X4 is the benchmark MTB and road stem — made in the USA, stiff, precise, and the go-to for professionals who need reliability.
What Is the Thomson X4 Stem? The Thomson X4 is Thomson's mountain bike and road racing stem — a machined alloy stem produced in Macon, Georgia. Used by downhill and enduro professionals who need a stem they can trust in the most demanding conditions. In production for over two decades. Key Features Made in Macon, Georgia USA — Thomson aerospace-grade machining Available in lengths from 40mm to 130mm Available in +/-10 degrees (road) and 0/+10 degrees (MTB) rise options 31.8mm handlebar clamp, 1-1/8 and 1-1/4 steerer options 4-bolt faceplate — even clamping, no stress concentration 25+ year production history — a definitively proven design Why Choose the Thomson X4? The same reason mechanics choose it for downhill racing: it does not fail. A Thomson stem holds its adjustment under the most
Frequently Asked Questions
- Will the Thomson X4 Alloy Stem fit my bike?
- Compatibility for the Thomson X4 Alloy Stem depends on details like frame standard, mount type or drivetrain speed, so it's worth checking your bike's specification against Thomson Bike Products's compatibility notes before ordering. If you're not sure, bring in your bike's make and model — or the bike itself — and our team at The Bike Zone will confirm fit before you buy.
- Can The Bike Zone fit the Thomson X4 Alloy Stem for me?
- Yes, our workshop team can fit the Thomson X4 Alloy Stem for you, whether it's a straightforward swap or a job that needs specialist tools. Book your bike in with us and we'll fit and tune the part correctly so it performs safely from the first ride, rather than risking a DIY installation going wrong.
- What's the warranty on the Thomson X4 Alloy Stem?
- The Thomson X4 Alloy Stem is covered by Thomson Bike Products's standard manufacturer warranty against defects in materials and workmanship. If anything goes wrong, bring it back to The Bike Zone and we'll handle the warranty process on your behalf rather than leaving you to deal with the manufacturer directly.