Vintage Campagnolo 52/42T Chainring Set 135 BCD 5-Arm Road Bike Italy Fit Record. Vintage Campagnolo double chainring set for classic road and racing bicycles. Tooth counts: 52T outer and 42T inner rings, marked 52/42 and 42 for a standard double setup. BCD: 135 mm 5-bolt pattern, confirmed using Sheldon Brown’s 5-bolt chainwheel guide shown in the photos. Compatibility: fits 5-arm 135 mm Campagnolo road cranksets and other crank arms using the same bolt circle. Part type and use: aluminum chainring pair for 2x drivetrains on vintage road, touring, or racing bikes. Material and construction: silver anodized aluminum rings with machined teeth and steel shift pins on the large ring. Logos and markings: both rings stamped BREV. CAMPAGNOLO and MADE IN ITALY along with the tooth numbers 52/42 and 42. Weight: combined ring weight approximately 150 g as shown on the digital scale display. Listing includes the two chainrings only; guide sheet, scale, zip tie, and any other background items are not included. Lightly used Campagnolo 52/42T double chainring set with chain wear on tooth faces and light cosmetic scratching on both rings. Teeth have small nicks and finish wear but no broken teeth or visible bending; shift pins and bolt holes are intact. Listing includes the two chainrings only with no chainring bolts, crank, or other hardware.