No way to tell, as it will be different depending on bike size and sprocket tooth count. Bike chains are always sold overly long and are then cut to size.
if these were the sprockets on a bike the front would be the 45 and the rear 20. Divide the big number by the small number to get the ratio 2.25:1
Tooth size isn't particularly useful. BMX all use the same width chain, so not much point in measuring thickness. Measuring tooth height won't tell you much either. The only thing left is the most useful info as well - tooth count. Count the teeth and you'll know what to get for a direct replacement as well as knowing what to get if you want change the gearing
Not a sprocket only, but you can buy a 23-tooth freewheel that should fit.
That would be different from bike to bike. Get a vernier caliper and measure it.
No.
9 tooth driver
When he was on Stage a kid named Clint piled up and hit his face. But the Tooth he lost on Stage was a Fake. He Originally lost his tooth in a bike accident when he was younger.
a 25 tooth sprocket will fit on a 9 tooth driver
Plus size bike shorts can be purchased at http://www.junonia.com/infocenter/Plus_size_bike_shorts_for_riding.htm. Junonia offers great plus size bike shorts for riding in style and comfort.
The weight of a human tooth ranges from 0.1 to 0.2 ounces, depending on the size and type of tooth.
13 tooth front/ 40 tooth rear