Alternator 2.0 Dropout Plate - non-drive side. - Allows the rear axle to be set in two different fore-aft positions 17mm apart - Only compatible with Salsa frames originally sold with Alternator 2.0 dropouts - Compatible with frames featuring 142, 148, 177, or 197mm spacing - Accommodates 12mm thru-axle - Non-drive side plate only - Designed for post-mount brake - Use only with Salsa Hardware Kit for Alternator 2.0 Fixed Position Plates (sold separately)