ROCKBROS 25210039002 Black Aluminum Stem Cap Phone Holder with 360° Swivel for 4.7-7.2 inch Phones

Unlike handlebar-mounted phone holders that clutter your cockpit or require additional brackets, this ROCKBROS model bolts directly onto the headset top cap, keeping your phone centered over the stem for a clean, aerodynamic setup. The spring-loaded clamp grips devices from 55 to 95 mm wide, covering screens from 4.7 to 7.2 inches, while the 360-degree swivel lets you switch between portrait and landscape in seconds. Machined from corrosion-resistant aluminum alloy with silicone contact pads, it absorbs road vibration and protects your phone from scratches, making it a reliable choice for road bikes, mountain bikes, and electric scooters.

Highlights

• Direct stem cap mounting: replaces the standard M6 bolt for a secure, low-profile fit
• Tool-free clamp adjustment: spring-loaded mechanism accommodates phone widths from 55 to 95 mm
• Full rotation: 360-degree swivel supports portrait and landscape orientation without removing the phone
• Durable construction: aluminum alloy body with ABS plastic and silicone padding resists corrosion and shocks
• Anti-slip grip: integrated silicone pads keep your phone stable on rough terrain
• Complete kit: includes phone holder, M6 bolt, and Allen key for easy installation

In daily use

Installation takes minutes: remove your existing stem cap bolt, align the holder, and tighten the included M6 bolt with the Allen key. Once mounted, the holder sits flush with your stem, adding minimal weight and no extra bulk. The spring clamp opens wide enough for large phones with slim cases, and the silicone pads dampen vibration from chip seal or gravel roads. Swiveling the phone is effortless—just rotate the cradle to your preferred angle and it stays put. Because the mount is bolt-on, it won't loosen or shift during aggressive riding, and the black finish blends with most bike frames.

Full specifications

• Brand: ROCKBROS
• Model: 25210039002
• MPN: 5907769390319
• EAN: 5907769390319
• Mounting position: Headset top cap (stem cap)
• Mounting mechanism: Bolt-on, replaces M6 stem cap bolt
• Phone clamp type: Spring-loaded mechanical clamp
• Compatible phone width: 55 mm – 95 mm
• Compatible screen size: 4.7 – 7.2 inches
• Rotation: 360-degree swivel
• Primary material: Aluminum alloy
• Secondary materials: ABS plastic, silicone
• Colour: Black
• Installation bolt size: M6
• Anti-slip features: Integrated silicone pads
• Shock absorption: Yes (via silicone padding)
• Adjustability: Tool-free clamp width adjustment
• Recommended application: Road bikes, mountain bikes, electric scooters
• Durability: Corrosion-resistant aluminum alloy
• Orientation support: Portrait and landscape
• Package contents: Phone holder, M6 bolt, Allen key
• Quick release: No (bolt-on installation)

Final note

For riders who want a secure, vibration-damped phone mount without handlebar clutter, the ROCKBROS stem cap holder is a smart, durable upgrade that keeps your device visible and accessible on every ride.