Spokes, hub, something loose inside the rim, loose nut on the presta valve, wobbly nipple?
At least it would give you somewhere to focus your attention, although you'll probably discover it's something completely unrelated after spending hours investigating
That one wheel is OK and the other isn't.
Spokes, hub, something loose inside the rim, loose nut on the presta valve, wobbly nipple?
At least it would give you somewhere to focus your attention, although you'll probably discover it's something completely unrelated after spending hours investigating