grumpier.mike wrote:
The 17 mm internal width will be mighty narrow for a 20. The 20s are really only beneficial on something really narrow like the old H3. The 23 also might have a tiny bit lower Crr and you can run about 105 vs 125 psi for better comfort.I realize this is a rear wheel and not a front, but TJ ran a 20mm Supsersonic on a Zipp 900 last weekend.