Hey guys,

I've reviewed countless threads on wheels and tires, but still not 100% comfortable with my picks for wheels in particular. Just not sure on the offset + wheel size, so would appreciate a double check before I buy. The specific model is a 2016 F Type S.

Looking at Rohana RFX2 wheels, https://rohanawheels.com/portfolio/rf2-wheel/
-5x108 bolt pattern
-20x9 in front
-20x11 in rear
-What offset for front and rear?

For tires, looking at Michelin PS4S based on all the threads here:
-305 in read
-265 in front

Appreciate any feedback! Love the look of slightly wider tires, but also drive it like I stole it so can't compromise on performance.

 

With those constraints (tire sizes and wheel widths) you’ll want a 45mm offset in front and 32mm in the rear. Will not ever rub the fender lip even under full spring compression.

 

Does Rohana make a 9.5 inch wide wheel for front?

 

That would indeed be the optimal wheel for a 265 tire. In that case a 49mm offset would be good.

 

https://tiresize.com/wheel-offset-calculator/

 

Awesome thanks, will get those ordered shortly! Are there any reliable calculators or methods of measuring to get to those offsets, or is it really trial/error from everyone's experiences? From other threads it seems like quite the variety out there on the f type.

 

The only way to test the limits is trial and error. The variety of offsets that people find successful is based on how likely they are to bottom out the suspension. With a lowered suspension, a car is more likely to use the full suspension travel. 15-17 mm is about as far as you want to push the wheels out. If the OEM springs are fully compressed, they too will have the same rubbing issues as the lowered suspensions, though most are unlikely to experience that condition. I would suggest a conservative approach to ensure that rubbing does not occur under any condition. If that aluminum lip catches the tire tread, it can be bent up pretty badly.

That 17mm number needs to be reduced by 5mm with a 305 tire and by another 6mm if you increase the wheel width by 1/2”.
The OEM 20” wheels have an offset of 55mm in front, 38 in the rear. The rear calculation: 38-(17-5-6)=32mm for an 11” wide wheel and a 305 tire.

 

Their is a calculator on this site under tools, but it won't solve for an unknown such as offset, but will give the resulting change relative to existing if all info is known for existing and new. I have posted other calculators I've found online that have diagrams illustrating the change. It helps to understand the changes but won't help with body clearances required to avoid scraping. Unhinged's info is from experience. Most reputable wheel seller's will guarantee fit. You need to ask and give complete info (like if you intend to lower the car). It helps if who you are buying from has experience with the f type. When I bought custom wheels for my XF, it took 3 tries to get the fit right. Brake clearances are also an issue, mostly on front with bigger brakes. Again, past experience, such as found on the forum, is a good way to verify what you are being told, but ultimately I would buy from a source that guarantee's fit as if the wheel you chose has a lot of concavity or unusual spoke configuration it can affect fit, mostly on front wheels.

https://www.jaguarforums.com/forum/t...calculator.php

 

+1 to everything Vince said.

 

Great learning for me, thanks guys! Going to be many more sports cars for me down the line, so good to get the full understanding on this process now.

Had noticed the lower kits out there, but assume that might compromise handling performance or reduce the size of tire you can fit under there?

 

Neither. Actually improves handling performance. Reduces body sway by lowering the center of gravity.