Tire Diameter
20" tires on a 2013 Ram 1500 have a 32.5 diameter 17" have a 31.7 diameter. What would be the apparent ratio or formula to arrive at such based on 3.55 gears.
Forum Discussion
3.55 means the driveshaft turns 3.55 times each time the tire turns once.
That won't change whether you have 17"s or 20"s.
Your "effective" ratio is only a RELATIVE measure, from where you are now. In other words, you get X performance now with 20" tires and a 3.55 ratio. Switching to 17" tires will give you the same net performance increase as going to a 3.64 ratio with 20" tires.
3.55-3.64 is not much. You probably won't even notice.
That won't change whether you have 17"s or 20"s.
Your "effective" ratio is only a RELATIVE measure, from where you are now. In other words, you get X performance now with 20" tires and a 3.55 ratio. Switching to 17" tires will give you the same net performance increase as going to a 3.64 ratio with 20" tires.
3.55-3.64 is not much. You probably won't even notice.
