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January 14, 2021 at 8:00 pm
A road bike frame is essentially three big tubes stuck together in a triangle, four thinner ones to support the rear wheel and a fork to hold the front wheel and allow it to turn.
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But it’s a lot more subtle than that, with the lengths, angles and shapes of the tubes making a huge difference to how the bike rides, its aerodynamics and what it’s useful for. Those measurements add up to the bike’s geometry and can be tweaked by the designer to define the ride characteristics and fit of a road bike.