What are some small circular car parts not over 5lbs?

brother's birthday is coming up, he is really into cars so i was looking to make him a clock to stick in his garage. need to know what are some small car parts that are circles that could be used as the face of the clock? please help|||the steering wheel. or a hub cap|||The flywheel is a good idea- small ones are about ten inches across, not too heavy and come with a hole in the middle, a good place to put clock works. You could use bolts for numeral markings, either using Roman numerals or just attached to the hour locations. I'd go with something like 6mm bolts for 1 and 2, 4 and 5, 7 and 8, 10 and 11, and 8mm bolts for 12, 3, 6, and 9. But you can choose whatever you like. If you call a machine shop that works on cars, you may get one for free. Hope your brother likes his clock, no matter what you do. Take care!|||Maybe the face off a speedometer or tachometer? Maybe the old fashioned round sealed beam headlight (if you can work with that ) Cars from the 50's had horn rings on the steering wheel that had logos on them. A gas cap might work. Maybe 1/2 of an oil filter. Many cars have round tail lights. You might also look at motorcycle parts which are similar to auto parts but often lighter. And often chrome.|||Find a used brake rotor ,already round with hole in middle for clock mechanism, can apply numbers and clear-coat rotor and not too heavy,|||hub caps, pulleys - the crank shaft pulley would be a good size. a water pump would make a neat clock. a brake rotor with wheel studs would make a nice clock but they weigh 16 or more lbs.|||you could glue lug nuts to something and use 12 of them as the number markers on the clock.|||a hubcap, steering wheel (maybe), or a rotor. ( although it weighs over 5lbs)|||how about washers and gaskets?