After a review by the ProSolo Committee, the following rules updates have been approved:
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The minimum class size for ProSolos will be changed from five (5) drivers entered to three (3) drivers entered. Any Open or Ladies (L1, L2, L3, or L4) Class that does not meet the minimum of 3 drivers will be bumped to a Bump Index Class for Challenge eligibility.
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With the Solo G Street (GS) class adjustment, GS ProSolo Indexes have been adjusted:
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GS (2wd) will be moved from .801 to .805
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GS4 will be moved from .801 to .807
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These changes will be effective 2/20/2026. The 2026 ProSolo Class and PSI Updates Summary have been updated and posted on theSolo Rules page.