DNM Cheap Dropper post unboxing and review
You can get it here: https://www.sethsbikehacks.com..../product/dnm-dropper
Updated after 6 months: http://youtu.be/PZ7cz3h1qx4
This is a review of the DNM dropper seat post.
This DNM dropper post is one of the cheapest ones on the market, and the quality is very impressive. Here's the good and the bad:
The Good
Super lightweight, reliable, looks nice, very sturdy, pretty easy to install, and cheap!
The Bad
Difficult to add air to initially, short travel (only 110mm), and the switch isn't the greatest. Also, I can't speak for how this works with a heavier rider. I'm only 155lbs, but I'm much harder on my bike than most people so it may work fine for heavy riders.
Overall
For the price, it's a no brainer. If my post was broken or stolen tomorrow, I would buy another identical one to replace it. I never wish I went with a different post, and I beat up my bikes pretty bad. I highly recommend it.
How to determine what size to get
Look at your current seatpost very closely. You may need to remove it from your bike to see, but the size should be printed on it somewhere. This post is available in 30.9 and 31.6, so if you don't have either of those sizes you may be out of luck. Super skinny steel bikes are hard to find dropper posts for, but if you have an aluminum or carbon frame you should be okay.