A Secure 34.9mm Clamp with a Clean Burgtec Finish.
The Burgtec 34.9mm Seat Clamp is a lightweight replacement or colour upgrade for compatible mountain bike frames. Made from 6061-T6 aluminium with corrosion-resistant stainless-steel hardware, it keeps the seatpost securely positioned while adding a tidy finishing detail to the bike.
Burgtec identifies the 34.9mm version as a size used predominantly on frames fitted with 30.9mm seatposts. This is only a general guide, however, as the required clamp diameter is determined by the frame rather than the seatpost alone.
Check the Clamp Diameter
The 34.9mm measurement refers to the outside diameter of the frame’s seat tube where the clamp fits. It does not refer to the diameter of the seatpost itself.
A 30.9mm seatpost does not automatically mean the bike requires a 34.9mm clamp. Frame construction and seat-tube wall thickness vary, so check the size printed on the original clamp, consult the frame specification or measure the frame before ordering.
Dropper-Friendly Installation
The opening at the rear of the clamp is wide enough to make installation easier around many internally routed dropper-post cables. Depending on the frame and cable routing, this may allow the clamp to be changed without disconnecting the dropper cable.
Check the routing before removing the original clamp and avoid pulling, twisting or placing unnecessary tension on the dropper cable or hose.
6061-T6 Aluminium Construction
The clamp is made from 6061-T6 aluminium for a useful balance of strength, durability and low weight. Its smooth edges and minimal shape give it a clean appearance that works well alongside other Burgtec finishing parts.
A corrosion-resistant stainless-steel bolt provides dependable clamping through regular riding and wet conditions.
Key Features
- 34.9mm seat-clamp diameter
- Designed for compatible mountain bike frames
- Used predominantly with frames fitted with 30.9mm seatposts
- 6061-T6 aluminium construction
- Corrosion-resistant stainless-steel hardware
- Wide rear opening assists with dropper-cable installation
- Smooth, low-profile shape
- Available in nine Burgtec colours
- Approximate weight of 22g
Our Thoughts
This is a simple way to replace a damaged clamp or match the seat-clamp colour to your Burgtec pedals, stem, grips or chainring. It is light, neatly finished and uses stainless-steel hardware that is well suited to mountain bikes ridden in mixed conditions.
The main thing to check is the diameter. Although 34.9mm clamps are commonly used on frames fitted with 30.9mm seatposts, this pairing is not universal. Confirm that the frame requires a 34.9mm clamp before ordering.
Use the torque specified by the frame or seatpost manufacturer when fitting it. Excessive tightening can damage the frame or seatpost and may prevent a dropper post from moving freely.
Why Buy from Chain Reaction?
- Help confirming the correct seat-clamp diameter
- Professional seatpost and dropper-post installation available
- Independent Christchurch bike shop
- Nationwide New Zealand delivery
Specifications
- Brand: Burgtec
- Product type: Seat clamp
- Clamp diameter: 34.9mm
- Material: 6061-T6 aluminium
- Hardware: Stainless steel
- Weight: Approximately 22g
- Available colours: Burgtec Black, Race Red, Deep Blue, Purple Rain, Kash Bronze, Iron Bro Orange, Rhodium Silver, Burgtec Bullion Gold and Toxic Barbie Pink
- Intended use: Compatible mountain bike frames
