When I bought my Thudbuster, I grabbed the cheapest one I could find that I could fit onto my bike. The one I picked up on eBay ($43 shipped) was 27.2mm. I found out that my seat tube on my bike was 30.6mm. I shimmed the space with some aluminum sheeting that I cut and rolled up to fit the space. It works, however, it slips and I can tell that the bike seat is dropping lower and lower after each ride. I finally went ahead and bought the proper 27.2mm to 30.6mm shim from Thudbuster.com. This should help to hold the seat tube in place and not slip anymore. It of course will look a lot better.
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