Is my friend lieing to me??
05-27-2009, 04:53 PM
#21
4th Gear Member
Join Date: Jan 2005
Location: Florida
Posts: 1,190
The other consideration with gears is if you race. If you are ending the quarter mile barely into 4th, you should get a shorter gear so you can be in your power band further into 4th gear. If you top out in 4th at the end of the track and have to shift just before the end, you are losing time and should go to a taller gear..
05-28-2009, 11:50 AM
#22
Is the tide gonna reach my chair?
Join Date: Mar 2007
Location: Nor'east
Posts: 4,389
according to discount tire direct's calculator going from a stock 245-55-17 to a 305-45-18 only adds .09" to the sidewall height. so when you were going 65mph on the old tire now you're going 67.8mph. for the overall tire height to go up an full inch you'd have to run a 305-55-18 to be over an inch difference.
255/45/18 = 27.03 in
305/45/18 = 28.80 in
305/40/18 = 27.60 in
305/55/18 would be 31.20 in or 4 inches taller than stock.
05-28-2009, 02:36 PM
#23
4th Gear Member
Join Date: Jan 2005
Location: Florida
Posts: 1,190
http://www.discounttiredirect.com/di...foTireMath.jsp
one thing I've noticed that people need to keep in mind is that every manufacturer varies a little in their sizing. if you're really worried about the size or rubbing you really need to look up the specs on the exact tire you're looking at, not just the general size rating.
if you go onto www.tirerack.com and find the tire you want if you click on 'specs' it'll give you the exact manufacturer's specs for that tire, not just the general size. with my last car I ran 255 rears and some manufacturers would vary up to an inch in the actual width and up to a half inch in the overall height. here's an example with a 295-45-18 since tirerack doesn't list a 305-45-18.
http://www.tirerack.com/tires/Spec.j...e1=yes&place=0
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folivier
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