I have a French 531 frame that originally came with a 26.4 that was always a little tight. I tried a 26.2 and it seems about perfect, adjusts with just a little drag and no slippage problems, so yes two sizes .2 mm apart can work fine under some circumstances. FWIW.
Kurt Sperry Bellingham WA USA
On 7/21/07, Jerome & Elizabeth Moos <jerrymoos@sbcglobal.net> wrote:
>
> My experience is that there are often 2 sizes that will work, that is if
> the larger size is a bit snugger than normal, a post one size smaller may
> hold without slipping. All depends on the roundnees of the interior of the
> seattube and the construction of the seatlug. But one never gets away with
> using a post more than 0.2 mm away from the ideal size.
>
> Regards,
>
> Jerry Moos
> Big Spring, TX