This PDF file includes:

• Fig. S1. Schematic and picture of piezo device.
• Fig. S2. Finite element analysis of strain transmission.
• Fig. S3. Sample aging and zero-strain tuning.
• Fig. S4. Comparison between three-piezo and single-piezo elastoresistivity measurement.
• Fig. S5. Additional longitudinal magneto-transport measurement as a function of strain.
• Fig. S6. Angle dependence of longitudinal magnetoresistance.
• Fig. S7. Fitting of positive longitudinal magnetoconductance.
• Fig. S8. DFT calculations of Z₂ topological indices, Poisson ratio, and DOS.
• Fig. S9. DFT band structures for ZrTe₅ in different strained states.
• Table S1. Dimensions, 2 K resistivity, and QC of each sample crystal.

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