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We consider twisted equivariant K--theory for actions of a compact Lie group$G$ on a space $X$ where all the isotropy subgroups are connected and ofmaximal rank. We show that the associated rational spectral sequence \`a laSegal has a simple $E_2$--term expressible as invariants under the Weyl groupof $G$. Namely, if $T$ is a maximal torus of $G$, they are invariants of the$\pi_1(X^T)$-equivariant Bredon cohomology of the universal cover of $X^T$ withsuitable coefficients. In the case of the inertia stack $\Lambda Y$ this termcan be expressed using the cohomology of $Y^T$ and algebraic invariantsassociated to the Lie group and the twisting. A number of calculations areprovided. In particular, we recover the rational Verlinde algebra when$Y=\{*\}$.

Twisted equivariant K-theory of compact Lie group actions with maximal rank isotropy