This is a great seatpost for bikes. I have this and a Blackburn SPX-1 Ultimate seatpost that I hooked up to another bike. I use both racks but prefer the Ibera SPX as the Ibera has several advantages. Firstly, the fixing mechanism is very smart, so the bike can be easily installed and removed with 1 screw. Second, there are attachment points for the Planet Bike Trail Light Bracket on the back so you can attach a flasher to the back. Finally, I love that the Ibera rack has 4 points to attach my bungee to - I use them every day to attach my duffel bag. a permanent solution, but not so easy to remove. The trunk bag fits well on the Blackburn, is very stable and has plenty of room to stabilize. Both frames are strong and can support approximately the same weight of 21 pounds. Overall, the Ibera PakRak Mini Commuter is a great bike rack for work. Easy on and off, durable, attachment points for lightning adapters and bungee ties.
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