The Topeak RX Beam Rack is a lightweight seatpost rack designed for road and fitness bikes, allowing you to carry a modest load. It’s compatible with RX TrunkBags and has a carrying capacity of up to 7 kg (15 lbs).
Here’s a detailed overview:
Key Features
- Compatibility: Designed for use on road and fitness bikes, the rack is compatible with all RX TrunkBags.
- Carrying Capacity: It can carry loads up to 7 kg (15 lbs), secured with built-in bungee cords.
- Construction: Typically made from AL-6061 T-6 aluminum.
- Side Frames: Some models include side frames for attaching panniers. However, one review suggests that the side supports might not be necessary.
- Mounting: The rack mounts to the seatpost with a hinged clamp and stainless-steel bolts, fitting seat post diameters from 25.4 – 31.8mm. Note that the mount uses Allen bolts, not a quick-release mechanism.
Types
The Topeak RX BeamRack comes in different types to suit various frame sizes




