Originally Posted By Thumperdart
Originally Posted By Sport440
Current gear/29"tire.
135.5 mph x 4.10 gear x 336/29" tire = 6436.+ 12% vert slip, =7209rpm

Same gear/28"tire.
135.5 mph x 4.10 gear x 336/28" tire = 6666.+ 12% vert slip,=7466rpm


thumbs Was even wondering if my vert slippage has to do w/the trap r`s and lookin back, I trapped bet 6700-7200 depending...........

Those calcs don't factor in bias-ply tire growth, so your slippage isn't that high.