RING SET 5T 46-58 +.060

This is a piston ring set for the Speed Twin (5T) engine, sized at +.060 over standard bore. Ring sets like this are what you fit when a cylinder has been rebored to bring it back to a clean, round working surface after wear - the oversize compensates for the metal removed in that process. The catalog entry we have on this one is brief, so we're passing along what the parts book tells us rather than dressing it up. The old-style alias B210 shows up tied to this same part number in our records, which is worth knowing if you're cross-checking against an older parts list.