TOOPRE Bicycle Seatpost Clamp 31.8mm / 34.9mm, Hollow Aluminum Alloy Locking Seat Tube Clamp, CNC turning

TOOPRE Bicycle Seatpost Clamp 31.8mm / 34.9mm, Hollow Aluminum Alloy Locking Seat Tube Clamp, CNC turning

The TOOPRE Bicycle Seatpost Clamp is a lightweight locking clamp designed for secure seatpost fastening on mountain bikes, road bikes, fixed gear bikes, and older steel frame bicycles shown in the product materials. Made from high-strength aluminum alloy, this version features a hollow lightweight design that helps reduce weight while maintaining a clean and functional structure for everyday riding and bike setup upgrades.

According to the supplied images and product details, the clamp is made with CNC turning, anodized surface treatment, and a screw-and-nut lock structure. It is available in 31.8mm and 34.9mm sizes, with color options including black, red, blue, golden, and colorful. The product materials also highlight a special nut design that allows the screw angle to adjust automatically during tightening, helping reduce deformation caused by stress concentration.

Key Selling Points

• High-strength aluminum alloy construction
• Hollow lightweight design
• CNC turning for fine cutting and clean workmanship
• Anodized finish with bright color presentation
• Multi-size and multi-color optional
• Screw-and-nut lock structure
• Special nut design helps the tightening angle adjust automatically
• Intended to help reduce deformation caused by stress concentration
• Suitable for mountain bike, road bike, fixed gear, and old steel frame applications shown in the images

Material, Construction & Finish

This seatpost clamp is made from aluminum alloy and uses a compact lock-clamp structure for practical seat tube fastening. The product images and text specifically show:

• Aluminum alloy body
• Aluminum alloy cylindrical nut
• Screw fixings (aluminum alloy)
• M5 screw (304 stainless steel)
• 4mm hexagon socket
• CNC turning anodizing
• Fine cutting
• Corrosion resistance

The anodized treatment gives the clamp a bright and refined appearance, while the hollow design adds a more lightweight visual and structural profile.

Available colors shown in the provided materials:

• Black
• Red
• Blue
• Golden
• Colorful

Size & Fitment

The clamp is offered in two inner diameter sizes:

• 31.8mm
• 34.9mm

The size guide shown in the provided images indicates the following compatibility:

The product images also recommend checking the seatpost diameter marking before purchase. If there is no visible mark, measure the seatpost diameter carefully to select the correct size.

Specifications

Packaging & Everyday Use Value

The clamp is shown packed in a TOOPRE brand-sealed bag, with package dimensions of 80 × 105mm, making it compact for storage, display, and shipping.

With its lightweight hollow aluminum alloy construction, clean CNC-machined lines, anodized finish, and multi-color options, this seatpost clamp is a practical upgrade for riders who want a simple locking solution with a more refined look and low overall weight.

Available Options

Each row below is one available option combination. Choose the complete combination that matches your setup.