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Twenty Niner
From WikiPedalia
The so-called "29 inch" tire size is not actually a new size, it is just a new marketing term for 622 mm (700C) wheels with fat tires.
This size is probably a good option for taller riders for off-road use, compared with 559 mm (26 inch decimal) wheels. Larger-diameter wheels don't sink as far into holes, so they give a better ride in rough conditions.
For shorter riders, wheels this large will cause unfortunate compromises in frame geometry, so they're probably not a good option for riders of short or medium height.
