Recently found some old bmx parts I had in attic one item is some chunky handlebars . Was looking for any help I. D ing them and if any good? They are 25 3/4”x 8” tall the clamp bar is wider than grip area, the measure for grip diameter is 2.2cm and bar clamp is approximately 2.6cm.weight 2lb 8oz the markings on bars are mj-4090 650 02 cr. I be attached some pics of emblem stamp also a primo chainring just to see if it’s rare etc thanks