TOOPRE Bicycle Seatpost Clamp 31.8mm / 34.9mm, Hollow Lightweight Aluminum Alloy Locking Seat Tube Clamp
The TOOPRE Bicycle Seatpost Clamp is a hollow lightweight aluminum alloy locking seat tube clamp designed for secure seatpost fastening on mountain bikes, road bikes, fixed gear bikes, and older steel frame bicycles. Made with high-strength aluminum alloy, it features CNC turning, fine cutting, and an anodized finish for a clean look, bright color presentation, and corrosion-resistant surface treatment.
Available in 31.8mm and 34.9mm sizes, this clamp comes in black, red, blue, golden, and colorful options. The product materials also highlight a screw-and-nut lock structure with a special nut design that allows the tightening angle to adjust automatically, helping reduce deformation caused by stress concentration. With a measured weight of 14.6g for the 31.8mm version and 15.2g for the 34.9mm version, it is a practical lightweight upgrade or replacement for everyday bicycle setups.
Descriptions
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:
| Seat Clamp Size | Applicable Seatpost Diameter |
|---|---|
| 31.8mm | Suitable for 27.2mm / 28.6mm outer diameter seatpost |
| 34.9mm | Suitable for 30.4mm / 30.8mm / 30.9mm / 31.6mm outer diameter seatpost |
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
| Item | Details |
|---|---|
| Brand | TOOPRE |
| Product Name | Bicycle Seatpost Clamp |
| Material | Aluminum alloy |
| Sizes | 31.8mm / 34.9mm |
| Color Options | Black, Red, Blue, Golden, Colorful |
| Process | CNC turning |
| Surface Finish | Anodized |
| Design | Hollow lightweight locking clamp |
| Net Weight | Approx. 15g |
| 31.8mm Version Measured Weight | 14.6g |
| 34.9mm Version Measured Weight | 15.2g |
| 31.8mm Inner Diameter | 31.8mm |
| 34.9mm Inner Diameter | 34.9mm |
| 31.8mm Version Height | 44mm |
| 34.9mm Version Height | 47mm |
| Width | 12.6mm |
| Packaging | Brand-sealed bag |
| Package Size | 80 × 105 mm |
Packaging & Everyday Use Value
The clamp is shown packed in a TOOPRE brand-sealed bag, with package dimensions of 80 × 105 mm, 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.
