True the recomended is 10.5 inches but 10 is close enough to be safe and to work properly. My point however was that to take advanatge of the extra grip in the rear its as simple as stiffening the rear end or softening the front (eg make the rear "looser"). Don't forget you're also increasing the front from 255 to 275 as well. If you aren't adjusting your suspension 285 all around is a common setup.
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'09 370Z - '93 300ZX Vert - '83 280ZX - '83 280ZXT -'81 280ZXT stroker - '72 240Z - Stillen CBE, HFC, G3, Grounding Kit, Sways // Swift Spring // H&R 15mm // 5% Tint // Clear Bra // 
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