Extra-Terra Boulder Lock XS | Heavy-Duty Bike Phone Mount
Β£69.95
Extra-Terra Boulder Lock XS | Heavy-Duty Bike Phone Mount
Β£69.95
Extra-Terra Boulder Lock XS
Heavy-Duty Bike Phone Mount
Β£69.95
Heavy-Duty Alloy Construction β’ Vibration Control β’ 7-Year Warranty β’ FREE UK Delivery
π¬π§ Held in UK Stock
Built for riders who need something more substantial than a lightweight plastic phone mount.
When the terrain gets rough, the mount matters.
The Extra-Terra Boulder Lock XS is a rugged mechanical phone mount designed for motorcycles, mountain bikes, enduro bikes, e-bikes and other high-vibration riding environments.
Instead of relying on lightweight plastic clips or basic spring tension, the Boulder Lock XS combines alloy construction, four-point phone retention, mechanical adjustment and vibration-control features to create a far more substantial mounting platform.
It is designed for riders who expect their equipment to deal with braking forces, acceleration, road vibration, trail impacts and repeated everyday use.
- 4-Corner Phone Retention β securely supports the device from four points rather than relying on a simple side clamp
- Vibration-Control Design β helps reduce harsh vibration and shock transferred through the mounting system
- Mechanical Locking Hardware β designed to resist unwanted loosening once correctly installed and adjusted
- 360Β° Positioning β adjust portrait, landscape or intermediate viewing angles
- Alloy Structural Components β engineered for riders who want something more substantial than lightweight plastic mounting hardware
- Fits Compatible Devices up to approximately 95mm wide
Built for Real Riding
The Boulder Lock XS is intended for riders dealing with the conditions that expose weak mounting hardware quickly: vibration, rough surfaces, repetitive impacts and changing loads.
It is not positioned as a disposable accessory. It is part of the Built4it heavy-duty mounting range.
Warranty & Support
π‘οΈ 7-Year Built4it Warranty
π¬π§ UK-Based Support
π FREE UK Delivery
β©οΈ 60-Day Money-Back Guarantee
Why Build a Phone Mount Like This?
Because bicycles and motorcycles generate forces that ordinary dashboard-style mounts were never designed to handle.
Repeated vibration, sudden impacts, acceleration, braking and rough terrain all place additional demands on the clamp, joints, fasteners and phone-retention system.
The Boulder Lock XS approaches the problem mechanically: strong structural hardware, secure phone retention and controlled adjustment instead of simply increasing spring pressure and hoping for the best.
Built for Bikes of All Types
- Motorcycles & road bikes
- Adventure & touring motorcycles
- Enduro & off-road bikes
- Mountain bikes
- E-bikes
- Commuter & everyday bicycles
- Trail and recreational riding
Designed Around Mechanical Retention
The phone holder uses a four-corner retaining architecture to physically support the device, while the mounting assembly provides adjustable positioning and mechanical clamping to the bike.
That makes the system particularly suited to users who prefer positive mechanical retention over magnetic-only or lightweight friction-based mounting.
Device Compatibility
Suitable for compatible smartphones up to approximately 95mm wide.
Always check your device dimensions, case thickness and mounting position before installation. Very bulky protective cases may affect compatibility.
Built4it Price β Β£69.95
No artificial crossed-out RRP. No permanent fake sale. The Boulder Lock XS is priced according to what it is: a specialist heavy-duty mounting system.
Eligible Built4it promotional or affiliate discount codes can still be applied at checkout where applicable.
FREE UK delivery included.
Whatβs Included
- Extra-Terra Boulder Lock XS phone mount
- Handlebar / bar mounting clamp
- Mounting and adjustment hardware
- Required fitting tools
- Quick-start / fitting information
Built4it Back-Up
7-Year Built4it Warranty
60-Day Money-Back Guarantee
UK-Based Customer Support
FREE UK Delivery
β©οΈ Try It Properly β 60-Day Money-Back Guarantee
A bike mount is something you need to experience in the real world. That is why qualifying Built4it purchases are backed by our 60-Day Money-Back Guarantee, subject to the applicable returns terms.
Installation & Safety:
Correct installation is essential on any bike or motorcycle mounting system.
Confirm compatibility with the intended bar or mounting point, tighten all hardware correctly and check the mount regularly for movement or loosening.
Device size, case design, riding conditions and mounting position can affect performance.
Do not position the mount where it interferes with steering, controls, instrumentation or rider visibility.
Use appropriate secondary retention where the riding environment or application requires it.
When the terrain starts fighting back,
make sure your mounting hardware is Built4it.
Heavy-duty construction. Mechanical retention. Proper UK backup.