My carbon fiber road bike build required a lightweight carbon fiber seatpost. Being frugal I wanted to get something affordable, but safe. I decided my best option was the RXL SL carbon seatpost from Amazon due to it having a good number of positive reviews. I really just needed it to not break, look ok, work with my saddle and be lightweight. It has met those just fine, have a look:
Specs
Material: Carbon fiber
Finish: Matte (glossy options also available)
Size: 27.2 x 350 mm (other sizes available)
Offset: 25 mm
Tightening torque: 4 Nm
Compatible rails: 6*6 steel, 7*7 steel, 7*7 carbon, 7*9 carbon, 8*10 carbon
Weights: 210 grams
Installation
For me installation went very easy, though the clamp is a little odd. In my case it’s a normal round 27.2 post and you clamp it in with 4 Nm of torque. I did use some Finish Line fiber grip since my frame is also carbon. The saddle clamp has a hex bolt that you tighten in the rear, but it also has a front bolt that goes in from the top. This is no problem if you have a saddle with a hole in it, but will slow you down if you don’t. The front bolt controls the angle of the saddle. So, if you loosen it the nose will move up and if you tighten the nose will move down. This adjustment will require loosening the rear bolt. If your saddle doesn’t have a hole this will require making the rear bolt really loose as you’ll have to use your hand to loosen or tighten the front bolt. Once you have the front bolt at the right depth you will tighten the rear one and done. I used 4 Nm torque on the rear bolt to hold the rails in place.
Performance
Post has been working well. I weigh about 180 lbs and it has held up fine and has never moved. Clamp has also held my carbon railed saddle in place well. It is also quite lightweight. So I have no complaints of its performance.
Rating
I’m going to give this one 4 stars because I think the clamp could be a little issue for anyone that doesn’t have a saddle with a hole in it. If you do have a saddle with a hole in it then install should be verry straight forward and I give it a 5 star rating. I’ll report back if I have any issues in the future with it, but after one season its been great!
