• I like my 25.4 risers, and I like my new over-sized Cinelli stem. So the question of a 6mm handlebar shim arises:

    coke can: ridiculous - not happening.
    ready-made shim: potentially unsafe?
    recently suggested: old mountain bike tyre. Tempted but wavering between it being ingenious/crazy

    Any thoughts or experience on this topic? Have come across a variety of opinions ranging from don't-it's-unsafe to the hand-making-wanking-motion-just-do-it-you-gaylord.

    "Find a stem/risers that fit blah blah" but other than clamp size the combination really improves riding position....

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