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My bike has no rear suspension. So I thought of putting a suspension seat-post on it. Unfortunately the only suspension post available in my city is a 25.4 mm one. I have added some scrap metal to fix it for now. But it's still a little wobbly. What is the best way to do this ?

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There are seatpost shims available for a few dollars. You should get them easily in your local shop or online.

I use an aluminum shim in one of my bikes with exactly the dimensions you need, it works flawlessly and looks very clean. I got it for about 3.50 € (5$).

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Yes, the important thing is that the shim go most of the way around the post, vs just being on one side. And having a "lip" at one end (as the commercial ones will have) keeps it from getting lost in the seat tube. (Aluminum beverage cans are a good source of shim material.) –  Daniel R Hicks Apr 15 at 13:34
    
As expected, no cycle shop in the city of Pune, India has heard of anything called shim. I finally put the rubber of a used tube to fit the post. Let's see how long it holds up. –  Ayan Mullick Apr 15 at 16:32
    
Try eBay search on "seat post shim", saw a lot of options. –  Papuass Apr 16 at 9:41
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@AyanMullick Rubber will not hold for long time - it's run dry on sun. Put in something made from metal. –  Alexander Apr 16 at 10:42
    
@Alexander That is exactly what happened. I am thinking I abandon the idea and order a SR Suntour SP12 NCX. That is the only one our local importer can import. :( ..So my options are either a Rs.300 local made or a Rs.8000 high-end Suntour; no options in between. –  Ayan Mullick Apr 19 at 1:44

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