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But as long as your not racing in them does it matter that much?

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I'm pretty sure that the fan blades are heavier than that, more on the order of 30.5 lbs

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20lbs. doesnt equate to 2 tenths. Otherwise I would be able to run 10s by simply removing seats and carpet... From what I heard 100lbs equates to 1 tenth. The other thing about 20s other than the weight is your changing your gearing with the larger rotating wheel/tires... Smaller diameter will spin more per one revolution than a larger diameter per that one revolution.20 plbs equates to 2 tenths in the quarter. Maybe more than than becuase you are talking about 20 rotating plbs.

20 lbs of rotating mass though?20lbs. doesnt equate to 2 tenths. Otherwise I would be able to run 10s by simply removing seats and carpet... From what I heard 100lbs equates to 1 tenth. The other thing about 20s other than the weight is your changing your gearing with the larger rotating wheel/tires... Smaller diameter will spin more per one revolution than a larger diameter per that one revolution.

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Even rotating mass...

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Yeah im not getting 20's i was talking about staying with 18's haha

Your right. I was thinking 10hp is 1 tenth, it is about 100plbs a tenth. Also 100plb equals ten hp.20lbs. doesnt equate to 2 tenths. Otherwise I would be able to run 10s by simply removing seats and carpet... From what I heard 100lbs equates to 1 tenth. The other thing about 20s other than the weight is your changing your gearing with the larger rotating wheel/tires... Smaller diameter will spin more per one revolution than a larger diameter per that one revolution.

I still think that becuase we are talking about the wheels that the weight does make a bigger difference than if was just 20plbs inside the car. It has to use more torque to turn the extra weight of the tire.

Anyway sorry for the blonde moment.

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No sweat... Thats why pencils have erasers...

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If you want to know what your new set up will feel like (I say "feel like" because your ratio is what it is 3.55).so wat would be my gear ratio for my car. I have 3.55 and have 20s with 285/30r20 but at the end of the month im going to 305/35r20..

find the number of rotations your current tires turn in a given mile (call this A), find out the rotations per mile of the tires you want (call this B). Make an algebra equation in which you have B/A = x/3.55

Multiply B by 3.55 and then divide the result by A.

So If I went from a tire that rotated 750 times per mile, up to a tire that rotates 775. My effective ratio goes from 3.55 to 3.43.

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If you want to know what your new set up will feel like (I say "feel like" because your ratio is what it is 3.55).

find the number of rotations your current tires turn in a given mile (call this A), find out the rotations per mile of the tires you want (call this B). Make an algebra equation in which you have B/A = x/3.55

Multiply B by 3.55 and then divide the result by A.

So If I went from a tire that rotated 750 times per mile, up to a tire that rotates 775. My effective ratio goes from 3.55 to 3.43.

Correction, keep it A/B.....for a ratio of 3.66

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