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The elastic $I=1$ $p$-wave $\pi\pi$ scattering amplitude is calculatedtogether with the isovector timelike pion form factor using lattice QCD with$N_{\rm f}=2+1$ dynamical quark flavors. Wilson clover ensembles generated bythe Coordinated Lattice Simulations (CLS) initiative are employed at fourlattice spacings down to $a = 0.05\,\mathrm{fm}$, several pion masses down to$m_{\pi} = 200\,\mathrm{MeV}$, and spatial volumes of extent $L =3.1-5.5\,\mathrm{fm}$. The set of measurements on these ensembles, which ispublicly available, enables an investigation of systematic errors due to thefinite lattice spacing and spatial volume. The $\pi\pi$ scattering amplitude isfit on each ensemble by a Breit-Wigner resonance lineshape, while the formfactor is described better by a thrice-subtracted dispersion relation than theGounaris-Sakurai parametrization.

The $I=1$ pion-pion scattering amplitude and timelike pion form factor from $N_{\rm f} = 2+1$ lattice QCD