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My new AWD 17" drag radial setup.

OffshoreDrilling

This is my safe space
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HVAC Guy
Aug 28, 2007
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Homer Glen
After attempting to buy 4 different sets of wheels, and all of them being backordered or discontinued, I finally managed to get ahold of a set. These weren't my first choice, but will do the job for track duty.

Wheels: American Racing "Marin" 17"x8.5" 6x127mm, +25
AMERICAN%20RACING%20MARIN%20NOIR%20MAT.jpg


Tires: 4 Nitto 555R 275/40/17 Drag radials.
post-a200493-nitto555r..jpg


Yes, I am aware the center caps are not on the wheels!

2nl5jde.jpg


10ejzfo.jpg


2mhbhhe.jpg

to give you an idea how tiny these are versus stock...


Stock wheel and tire combo was 68lbs each, and these are 49lbs each. 80lbs of rotating weight GONE! Im hoping to pick up three tenths in the 1/4 with these bad boys.
 

Yaj Yak

Gladys
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May 24, 2007
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1.6 anything would be great for 60's. I am nearly there now with cutting a handful of 1.71s. Most of the gains from running these will be the gear ratio change and reduction of rotating mass.


I don't get the gear ratio deal here...

cuz I don't fully understand it.

Stock tire size is 255/50/20 which is around 30.04 inches tall... stock gear ratio is 4:10 right...

so now you got 275/40/17 (these are seriously shorter than the tires on my pricks :rofl:) which are 25.66 inches tall... sooo

from here:

http://www.4lo.com/calc/geartable.htm



so (25.66/30.04)x4.10= 3.502.... so now your truck which had an effective gear ratio of 4.10, now has 3.50 gears...

you goin for that cuz the 4:10s are super steep coming out of the hole?
 

OffshoreDrilling

This is my safe space
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HVAC Guy
Aug 28, 2007
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Homer Glen
I don't get the gear ratio deal here...

cuz I don't fully understand it.

Stock tire size is 255/50/20 which is around 30.04 inches tall... stock gear ratio is 4:10 right...

so now you got 275/40/17 (these are seriously shorter than the tires on my pricks :rofl:) which are 25.66 inches tall... sooo

from here:

http://www.4lo.com/calc/geartable.htm




so (25.66/30.04)x4.10= 3.502.... so now your truck which had an effective gear ratio of 4.10, now has 3.50 gears...

you goin for that cuz the 4:10s are super steep coming out of the hole?

That isnt the correct calculation for the final drive ratio. That calculator is telling you what gear you need to put in the rear end to keep the RPM and MPH the same for a given tire size.

Using this calculator, its a 4.80 gear now.
http://www.4lo.com/calc/geartire.htm
 
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