Putting 28s on my Ironman would violate the spirit of Eroica in my opinion. Silly I guess but that is the fun part for me. Most cyclists choose not to ride the Eroica CA long course on 25s pushing a 13/24 freewheel with 52/42 Biopace chainrings with friction shifters,, trying to brake using single pivots with 37 year old pads, cables and housings.
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I don't do: disks, tubeless, e-shifting, or bead head nymphs.