... for bicycle frame:1) Products:Round pipe,square pipe,flat pipe,special designed pipe2) Grade: 1050,3003,5052,5083,6005,6061, ... cold drawn etc. Features of aluminum tube for bicycle frame The relative products: Aluminum Alloy Tube, Aluminum Tube Coil, Seamless Stainless Steel ... 5.8m. Round aluminum tube for bicycle frame 1. Tolerance of frame thickness: +/-0.1~0.25mm.2. Alloy & temper: 6063-T5, Grade ...