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    I'd be checking with the maker of the frame to ensure warranty will not be voided. Get their answer in writing and keep it safe.
    – Criggie ♦
    Commented Jul 21, 2016 at 11:07
  • Another option is to get the seatpost remade as a 31.6mm by a competent engineering firm. I had one make me a 750mm 28.6mm seatpost for a folding bike and other than being brutally expensive, it worked great.
    – Criggie ♦
    Commented Jul 21, 2016 at 11:08
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    I'm not 100% but I can't imagine there'd be a problem with the two materials, as long as the fit is good. Of course a shim is not as good a solution as a seatpost that fits, but I suspect you know this already. But @Criggie is right - check how you stand as regards warranty.
    – PeteH
    Commented Jul 21, 2016 at 12:42
  • Random thought - can you get a carbon fibre shim rather than an aluminium shim? That way it can keep any corrosion away from your frame. The shim should be at least as long as your seatpost's minimum insertion line, and longer is totally fine.
    – Criggie ♦
    Commented Feb 10, 2019 at 5:42