19" vs 20"

[Oknowsbetter]

I'm on the fence on which size to get in a set of forgestar CF5V. Let's hear which size you chose and why?

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[Slow89]

same here, i want to go 19s because i think 20s are too big but feel like 20s are cheaper for some reason lol

 

[Jon|3.7]

i was originally thinking 20's but in the end felt they were too big. i'm on 18's right now currently waiting on my 19's, but every time i look it at i like how low it is so i didn't want to go with 20's in the end.

 

[Arsenalslr95]

I think 20s look small, so I went with 20s because I sure as hell would think 19s looked small.

I be sittin on dubz naw mean

 

[madsedan]

Depending on the wheel I think 20's look great, BUT, I drive allot of highway miles and use the car daily. I also like the idea of sticking with something close to stock sizing for cost of tires as well as ride comfort and performance. I also do not want to run a 10"+ wheel in the rear, would be wasted on a highway driver like myself.
Unless I get a great deal on 20" I will stick with 19".

As far as appearance, the body lines flow well with 20's but as long as the car is lowered a little either size should look good.

 

[Schu]

19"... who wants to run around on wagon wheels.

 

[ForTehNguyen]

20" has better tire selection, 19" kind of annoying finding the proper sizes. But I still want to stick with 19"

 

[Need4SpeedMotors]

There are give and takes for both sizes. With the Forgestar CF5V the beautiful thing is that it is the lightest wheel in the Forgestar lineup.

That being said here are a few things

19" tires are abit limited when you have to go wide, but there are still some amazing choices.

20" you have a larger selection of tires to choose from.

Now personally I love both sizes, 20" wheels help fill up the fenders really well.

This is Pinero61's ride I setup on 19x10 & 19x11 CF5V with 275/305 NT05 rubber

Here are some 20x9.5 CF5V

 

[gsxr1300]

20's

 

[Arsenalslr95]

19"... who wants to run around on wagon wheels.

.....because 1" makes a wheel go from being "super awesome" to a "wagon wheel"........

 

[Excelerater]

GT350 comes w 19s so I ordered 19s for my base GT,I was also concerned about
sidewall being too short on a 20 and offering a hard ride . However both look great to me

 

[valentinoamoro]

I've thought about this as well. Considerations for me:

• I will only use Michelin PSS or AS3 tires. I dont want an exotic size that doesnt have these tires and/or are likely to be discontinued.
• I will lower it with springs for handling, max 1 inch, ideally less. Springs and smaller diameter tire/wheel combo will be too low for me. Dont want to scrape
• I want to change wheels so they are lighter and pic a wheel tire combo size and width wise that optimizes handling.
• I will only do a 285F and 305R or 285 square setup (10 inch fronts and 11 inch rears if staggered or 10 inch square wheels). This is the ideal setup, go any wider in the rear (keeping a 285 Front) and understeer will be an issue. The widest you can realistically go in the front is 285.

So....

Keeping that in mind

My 2 cents:

• 19's look great with a 40 sidewall tire (285 front size tires minimum on 10 inch width wheels). This gives a diameter of about 28 inches and fills the wheel well nicely. The tire selection is excellent in 285/40's. Michelin AS3 and PSS available. Good protection for the wheels from potholes etc, important if you have expensive wheels etc. The 'tread width' on the ground is largest for this combo, the 20 inch with 35 sidewall has a smaller tread width.
  
• 19's on a 35 sidewall tire dont fill the wheel well nicely and lower the car. Tire/wheel diameter is 26.9 inches (stock GT PP is 27.7 inches rear). This will also cause gearing to lower, more shifting and 5% higher mileage than stock. Good tire options available though as well and is also slightly lighter than the 40 sidewall (by 2 pounds per wheel). This is a very common configuration on a bunch of performance coupes (M3 etc). Smaller tread width than 40 sidewall for some reason (meaning, effective tire is narrower).
  
• 20 inch on 35 sidewall is a good option, fills the wheel well nicely as N4S motors says. But generally will ride a lot rougher and probably weigh more. My issue with this configuration so far is, if you go staggered, the only stagger you can get is 285F and 305R. Anything more is inviting understeer. In that size, there is no Michelin tire, defeating the purpose of why I want more tire. If you go 285 square, a bunch of good options exist including both Michelins! (smaller tread width than 40 series tire on 19 inch wheel for some reason).

So for me, its a question of 285/40 19 inch square setup or 285/35/ 20 inch square. I'm leaning towards the former due to benefits to ride, more protection from potholes, wider tread width (from tirerack tool) and potentially less weight. The widest tread width is important if grip and performance is one reason to change and move to a wider wheel. Why get a 285 35 sidewall tire on a 20 inch wheel when a 285/40 sidewall tire on a 19 inch wheel has more lateral contact surface?

I've probably over thought this, but hope my findings help you.

 

[Cloak]

I've thought about this as well. Considerations for me:

• I will only use Michelin PSS or AS3 tires. I dont want an exotic size that doesnt have these tires and/or are likely to be discontinued.
• I will lower it with springs for handling, max 1 inch, ideally less. Springs and smaller diameter tire/wheel combo will be too low for me. Dont want to scrape
• I want to change wheels so they are lighter and pic a wheel tire combo size and width wise that optimizes handling.
• I will only do a 285F and 305R or 285 square setup (10 inch fronts and 11 inch rears if staggered or 10 inch square wheels). This is the ideal setup, go any wider in the rear (keeping a 285 Front) and understeer will be an issue. The widest you can realistically go in the front is 285.

So....

Keeping that in mind

My 2 cents:

• 19's look great with a 40 sidewall tire (285 front size tires minimum on 10 inch width wheels). This gives a diameter of about 28 inches and fills the wheel well nicely. The tire selection is excellent in 285/40's. Michelin AS3 and PSS available. Good protection for the wheels from potholes etc, important if you have expensive wheels etc. The 'tread width' on the ground is largest for this combo, the 20 inch with 25 sidewall has a smaller tread width.
  
• 19's on a 35 sidewall tire dont fill the wheel well nicely and lower the car. Tire/wheel diameter is 26.9 inches (stock GT PP is 27.7 inches rear). This will also cause gearing to lower, more shifting and 5% higher mileage than stock. Good tire options available though as well and is also slightly lighter than the 40 sidewall (by 2 pounds per wheel). This is a very common configuration on a bunch of performance coupes (M3 etc). Smaller tread width than 40 sidewall for some reason (meaning, effective tire is narrower).
  
• 20 inch on 35 sidewall is a good option, fills the wheel well nicely as N4S motors says. But generally will ride a lot rougher and probably weigh more. My issue with this configuration so far is, if you go staggered, the only stagger you can get is 285F and 305R. Anything more is inviting understeer. In that size, there is no Michelin tire, defeating the purpose of why I want more tire. If you go 285 square, a bunch of good options exist including both Michelins! (smaller tread width than 40 series tire on 19 inch wheel for some reason).

So for me, its a question of 285/40 19 inch square setup or 285/35/ 19 inch square. I'm leaning towards the former due to benefits to ride, more protection from potholes, wider tread width (from tirerack tool) and potentially less weight.

I've probably over thought this, but hope my findings help you.

I like your over-thinking, I am the same way. I would love to hear your thoughts on this; I have posted this question before but have not had anyone attempt to answer it.

I don't mean to hijack this thread, but this question has been running through my mind for a while.

The GTs have squared setup wheels/tires, unless it's a Performance Package. (235/50r18, 255/40r19, and 265/35r20). All of these tires have a overall diameter between 27.1" to 27.4". Now, on those models, the highest gear ratio you could get is a 3.55. The performance package comes with 3.73s.

Now my question is; wouldn't increasing the low 27" diameter to 27.7" (pp rear) effectively negate some of the benefit of going with shorter gears? According to my calculations; if the GT PP came with 255/40r19 squared, and you switched out the rear to a 275/40r19, your effective gear ratio would be 3.65.

Now the confusing part is, what tire diameter is optimal for the 3.73s? a 27" or closer to a 28"?

 

[DRKHR5]

I just ordered 19's.

For one reason… i made 1 single mistake in purchases for my s197 2007 gt. I bought a 20 inch rim and instantaneously felt the rigidity and relative "unhealthiness" vibrating through the bones of the car. Less rubber more road effects and vibrations and whatnot.

I went to 18's with nice sidewall and literally never had a worry again. Never clenched my teeth over railroads or sewer bumps again. The stress relief alone was worth the switch. But ill never forgive myself for wasting money on the initial purchase and loss on resale.

and to clarify…. this mustang looks killer on 19's and 20's because the body seems to command a bigger rim and tire combo to fill out the wheel well. Therefore i didn't consider the 18 for my daily set up… 19's will be plenty "healthy".

However… my pure track set-up will be 18's with a PHATTY Race Slick all around… or get super serious and change up plenty of components in search of the ultimate performance and go down to 15's on a racing rim with racing slicks.

my 2 cents

 

[101charley]

I ordered matte gunmetal Forgestar CF5V in 19 x 10 Front and 19 x 11 Rear with 275/40/19 and 305/35/19 Michelin PSS. Due by 10/31/15.I went with 19"because I think 20"is just too big. 19" is the perfect size for this car IMO. Lowered with Steeda Progressive springs the will be perfect.

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