Mazda RX-8 Workshop Manual page 1344

2. Rotate the adjusting cam bolt in either direction to adjust the caster.
Standard suspension
*
Vehicle height
366—375 {14.5—14.7} 6°45'
376—385 {14.9—15.1} 6°33'
386—395 {15.2—15.5} 6°20'
396—405 {15.6—15.9} 6°07'
406—415 {16.0—16.3} 5°55'
Sport suspension
Caster