Practical Companion for Your Bike Trips
Do you need to carry gear on your bike, but your frame lacks eyelets for a standard rack? The aluminum seatpost rack
AUTHOR ACR-SP05-Alu mounts directly to your bike's seatpost using a sturdy 4-bolt clamp. You can easily handle the installation yourself in just a few minutes.
The rack offers a stable loading platform with a length of 31 cm. Thanks to its universal design, it perfectly fits the vast majority of seatpost diameters and wheel sizes, from 24" kids' bikes to 29" adult mountain bikes. It is made of a lightweight aluminum alloy, weighing only 555 grams, yet it reliably carries loads up to 10 kg.
Important Notice: This rack is designed exclusively for standard metal seatposts. For safety reasons, it must never be mounted on carbon fiber components.
Perfect Match for Author Bags - this model is dimensionally and structurally tailored for popular Author rear bags. The following models fit perfectly and attach easily to the rack:
- Author A-N472 – A cycle touring bag with a variable volume of 9–14 liters and an integrated rain cover.
- Author A-N216 – A padded Velcro-mount bag with an adjustable volume of 7–9 liters.
- Author CargoCage WP 9 – A 100% waterproof bag (9 L) that attaches securely to the rack using the universal AES-991 fastening strap.
Technical Specifications:
- Material: Alloy 6061 (tube diameter 10 mm)
- Weight: 555 g
- Maximum Load Capacity: 10 kg (may be limited by the bike frame and seatpost design)
- Platform Dimensions: length 310 mm × width 115 mm
- Total Rack Length: 435 mm
- Compatible Wheel Sizes: 24", 26", 27.5", 29", 700c
- Designed for Seatpost Diameters: 25.0 mm to 35.0 mm
- Mounting Type: 4-bolt M6 clamp (for 5 mm Allen key)
- Certification and Standards: Tested in accordance with European standard EN 14872
