I was going to replace the rear shock on my old bike with an aluminum bar because the bike felt like a pogo stick. But then had the idea of just replacing the spring. I took a piece of pvc which can be anywhere from about 2 to 4 inches, and is 1 1/4" ID, exactly the size of the spring. $1.97 for a 10ft piece. I'm just using it on the trainer now. Not sure how it will hold up on the trails, but I rarely ride it anyway. The pipe has 1/8" walls so it's pretty stout. What do you all think? Think it will hold up?