We have one very similar to the one V posted (ours is a different brand), and it's wonderful. It really can adjust to work at any angle and to hold a bike by just about any tube diameter. It's very stable in use but folds up small enough for easy storage. We've used it on carbon, steel, aluminum and Ti bike frames with success. We've used it on big mountain bike top tubes, flattened cross bike top tubes, multiple types of seat posts, thin old steel frames and even to easily hold a 38 lb commuter without incident. Two thumbs up from us!