A tubing cutter (10; 210) comprising: a housing defining a work region for receiving a workpiece (1; 2) to be cut; a radially positionable roller carriage (65; 265) having at least one roller (60, 62) accessible along the work region of the housing; a cutting wheel supported within the housing and accessible along the work region of the housing; a size indexing assembly (100; 300) for selectively positioning the roller carriage (65; 265) relative to the cutting wheel in one of a plurality of positions corresponding to sizes of workpieces (1; 2); wherein the size indexing assembly (100; 300) includes: (i) the housing also defining a trigger slot (110; 310) accessible along an exterior of the housing, (ii) a moveable trigger (120; 320), (iii) a plurality of engagement regions (130, 132; 230, 231, 232) on the roller carriage (65; 265) and configured for selective engagement with the trigger (120; 320), wherein the housing also defines an arcuate slot, the tubing cutter (10; 210) further comprising: an axle moveable along the arcuate slot, wherein the axle rotatably supports the cutting wheel, and further comprising: a biasing member (92, 98, 126) urging the axle toward an end of the arcuate slot, characterized in that: the positions corresponding to sizes of workpieces are predetermined positions; the moveable trigger is selectively positionable along the trigger slot; each engagement region of the plurality of engagement regions on the roller carriage, corresponds to a predetermined radial position of the roller carriage; the arcurate slot is accessible along an exterior of the housing. a housing defining a work region for receiving a workpiece (1; 2) to be cut; a radially positionable roller carriage (65; 265) having at least one roller (60, 62) accessible along the work region of the housing; a cutting wheel supported within the housing and accessible along the work region of the housing; a size indexing assembly (100; 300) for selectively positioning the roller carriage (65; 265) relative to the cutting wheel in one of a plurality of positions corresponding to sizes of workpieces (1; 2); wherein the size indexing assembly (100; 300) includes: (i) the housing also defining a trigger slot (110; 310) accessible along an exterior of the housing, (ii) a moveable trigger (120; 320), (iii) a plurality of engagement regions (130, 132; 230, 231, 232) on the roller carriage (65; 265) and configured for selective engagement with the trigger (120; 320), wherein the housing also defines an arcuate slot, the tubing cutter (10; 210) further comprising: an axle moveable along the arcuate slot, wherein the axle rotatably supports the cutting wheel, and further comprising: a biasing member (92, 98, 126) urging the axle toward an end of the arcuate slot, characterized in that: the positions corresponding to sizes of workpieces are predetermined positions; the moveable trigger is selectively positionable along the trigger slot; each engagement region of the plurality of engagement regions on the roller carriage, corresponds to a predetermined radial position of the roller carriage; the arcurate slot is accessible along an exterior of the housing. (i) the housing also defining a trigger slot (110; 310) accessible along an exterior of the housing, (ii) a moveable trigger (120; 320), (iii) a plurality of engagement regions (130, 132; 230, 231, 232) on the roller carriage (65; 265) and configured for selective engagement with the trigger (120; 320), the positions corresponding to sizes of workpieces are predetermined positions; the moveable trigger is selectively positionable along the trigger slot; each engagement region of the plurality of engagement regions on the roller carriage, corresponds to a predetermined radial position of the roller carriage; the arcurate slot is accessible along an exterior of the housing.