gtasa/data/handling.cfg
DIRTBIKE      500.0     200.0   4.5    0.0 0.05 -0.09 103 1.4 0.9  0.48 	5 190.0 50.0 5.0  R P 	15.0  0.50 0 35.0  	0.85 0.15  0.0   0.15 -0.20 0.5  0.0		0.0  0.15 10000 	1000000		0			1  1	4

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gtasa/data/vehicles.ide
468,	sanchez,	sanchez,	bike,		DIRTBIKE,	SANCHEZ,	biked,	motorbike,	10,	0,	3f341210,		16, 0.68, 0.68,		-1

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gtasa/data/carcols.dat
sanchez, 0,2, 3,0, 2,3, 0,21, 43,0, 47,0

get that mod car colors make your game more cool ;)
http://www.gtainside.com/en/sanandreas/mods/86342-car-colors-mod/