GCS Mountain Bike Stem
“Top notch build quality and stiffness.”off.road.cc
“The PEMBREE cockpit provided a reassuringly solid feeling.”The Loam Wolf · First ride
Developed for the most demanding mountain bike riding, the GCS stem combines rigidity, precision, and reliability. Its wide clamping area maximizes handlebar grip for crisp handling, even on the most demanding terrain.
The GCS stem is designed to take a beating without flinching. A benchmark of reliability for those who ride hard.
Learn About the GCS Stem
Pair it with our GCS handlebars, available in 31.8mm and 35mm clamp to match the stem.
Fitting your GCS stem? Read the GCS Stem Installation & Care Guide.
A 35mm stem built for gravity riding
The GCS is a 35mm stem designed for enduro and downhill riders who want a stiff, precise front end. It is also available in a 31.8mm clamp, so you can match it to your bars. Pair it with the GCS handlebars, offered in both clamp diameters.
Key specifications
- Handlebar clamp: 35mm or 31.8mm
- Zero rise, 40mm stack height
- EFBE Gravity tested
- Made from 75% recycled aluminium
- Six colours: Silver, Black, Turquoise, Purple, Bronze and Pink
Choosing between a 35mm and 31.8mm stem
The stem clamp must match your handlebar diameter. Choose the 35mm stem for 35mm bars and the 31.8mm version for 31.8mm bars. The wide clamping area holds the bar securely for crisp, predictable steering on rough terrain. Size guide: MTB stem length guide. Clamp size: 31.8 vs 35mm handlebar clamp.
Fitting and care
You will need a 5mm hex key and, ideally, a torque wrench. PEMBREE recommends 9 Nm for the GCS stem bolts. Follow the GCS Stem Installation & Care Guide for every step. If a clamp is ever damaged, replacement GCS stem clamps are available.
UK made
The GCS stem is made in the UK and assembled in France, and it is covered by PEMBREE+.
Frequently asked questions
What torque should I use on the GCS stem bolts?
PEMBREE recommends 9 Nm for the GCS stem bolts, using a 5 mm hex key and a torque wrench. Follow the GCS Stem Installation & Care Guide step by step.
Which colours is the GCS stem available in?
Six colours: Silver, Black, Turquoise, Purple, Bronze and Pink.
What warranty does the GCS stem have?
The GCS stem has lifetime warranty cover. See our warranty policy for details.
How quickly will my order be dispatched?
Orders are dispatched in 2–4 days from our UK, France or USA warehouse, depending on your region.
Can I return it?
Yes, within 14 days. See our refund policy or contact our support team.
Read our guide to mountain bike cockpit setup: stem, bars and grips
Benefits
✔ Ultra-wide clamping for optimal rigidity
✔ Tested and approved by EFBE – TRI-TEST® GR certification (freeride & DH)
✔ CNC machined for precise fit and premium finish
✔ Stainless steel screws with washers: protects the aluminum and ensures a long-lasting hold
✔ Designed for downhill, freeride and enduro
Build your PEMBREE bundle
Pair your stem with GCS handlebars in matching colours and unlock more savings as you build.
Fit & FAQs
Which handlebar clamp diameter do I need?
The GCS stem is available for 31.8 mm and 35 mm handlebars. Check the clamp diameter printed near the centre of your bar and choose the matching stem.
What length and rise is the GCS stem?
The GCS stem is 35 mm long with 0° rise and a 40 mm stack.
What is it made from and where is it made?
It is CNC machined in the UK from 6000 series aluminium (75% recycled) with M6 stainless steel bolts and washers, and assembled in France.
Is it strong enough for downhill?
Yes. The GCS stem has passed the EFBE Gravity Tri-Test and is designed for downhill, freeride and enduro.
Pairs well with
GCS Mountain Bike Stem
Maximum Clamp Control
An ultra-wide clamping area boosts rigidity for precise, confident handling.
Precision Machined
CNC machining delivers an exact fit with a clean, premium finish.
Built to Last
Stainless steel hardware with washers protects the aluminium and keeps everything tight over time.
Made to Ride Hard
Designed specifically for downhill, freeride and enduro riding.
X Marks the Spot
Machined markings on both body and clamps for perfect alignment, every time.
System Thinking
Built together. Rides together.
The GCS components are engineered to complement each other — tolerances matched, aesthetics unified, superior performance delivered.
UK Made
GCS Stem brings serious strength and precision to your cockpit.
Manufactured out of 6000 series aluminium, GCS stem is entirely CNC machined in the UK. With corrosion proof stainless steel bolts throughout to ensure you are never let down.
Technical specifications
Material: 75% recycled aluminium
Clamp Diameter: 31.8mm, 35.0mm
Length: 35mm
Bolts: M6 Stainless Steel with washers
Stack: 40mm
Rise: 0°
Testing: EFBE Gravity Tri-Test
Made in: UK, assembled in France