I am looking for an new seat post for my O.P. bike I bought at wal mart . I am thinking about this seat post Amazon.com: Truvativ 2010 Stylo Race Alloy Mountain Bicycle Seatpost - 400mm: Sports & Outdoors I found at amazon . The seat I bought here Worksman Cycles - Accessory Store at worksman is lovely to me , but the back and fourth teeth are very striped out and and the bike is too dangerous to ride like this. The alen bolt type seems better to me. I don’t know what size the post is on my O.P. is since I don’t have an metric measuring tape . another thing that came in mind is that the rails under the worksman seat may be too wide ? Just an guess would help me , or another avenue for an seat post idea