Originally Posted by tallbikeman

My son rides an old Ross American style 10 speed whose front chainrings have worn down to little knives rotating around. I suggested changing out these original one piece crank chainrings but he told me the bike shifted superbly and he didn't want to change them. They are behind a chrome chainguard which does protect your leg. I believe he will wear these down to nubs before he changes them. As you can see Ross helped the front derailler by only putting every other tooth on the sprocket which leads to higher wear. Like you I haven't really worn out chainrings as bad as this one is worn. I do split my rides equally between 3 bicycles and that does keep wear down. Good old American made bicycle still plying the streets.