There appears to be two major sources for 26.8 and 29.8mm seatposts. 
Kalloy, as you mentioned, and Thomson. Not sure anyone else, including 
Nitto sells a 29.8mm.Good Luck!


On Monday, November 11, 2019 at 10:39:19 AM UTC-8, Matt D wrote:
>
> So what's the deal with Grant's thinking on seatposts? There are a lot of 
> Rivs that come with the 26.8mm seatpost standard. Roadini, Sam H., and the 
> lower two sizes of the Clem come with 26.8 and I believe all the others are 
> made for 27.2 or 29.8 in the case of the Hubbuhubbuh and 59cm Clem.
>
> So, my questions...
>
> Considering how hard they are to come by outside of the stock Kalloy 
> seatposts Rivendell ships with frames, "Dajia Cycleworks" (really just a 
> Velo Orange house brand), and Nitto stuff, why use it at all? Does the 
> 0.4mm jump really impart much of a benefit to ride quality? If it does and 
> you're already willing to forego wide compatibility why not go straight to 
> 26.0? When 26.8 isn't used, why isn't it used? Why jump straight to 29.8 
> for the largest Clem? If a 59cm Clem needs such a beefy seatpost shouldn't 
> the 57 and 61 Roadinis get one too, or are they not offroady enough? Why do 
> tall Clems have to use a seatpost in a size Rivendell doesn't even sell? Do 
> the Roadeo and Homer use 27.2 so people can use more conventional 
> with-the-times parts on it and if so, why not others too?
>
> I've always been baffled by this so if anyone with inside knowledge can 
> explain this to me I'd love to hear why.
>

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