GSman

iTrader: (2)

In everything I've read, it seems the popular staggered tire setup for 19 and 20 inch wheels are 245-35-19/275-30-19 and 245-35-20/275-30-20, respectively. Even though they are different wheel sizes, the profile is the same 35/30. So here are my questions:

Holding everything constant, wouldn't the 20" be taller and throw off your speedo/odo?

Is the 19" or 20" setup closest to stock diameter specs?

Since they are of the same profile, it seems there would be no more protection to the wheel by going with 19". Correct?

Why wouldn't you just go with 20"s vs 19"s unless there is a big price difference in the tires/wheels?

Thanks,

2SAVVY

Great question can't wait to see the answer from our Wheel Guru's..

For me 19" would be the choice because tire prices don't hurt too much..

Ag02M5

GSMan,

You are correct all around.

The 19s will be closest to stock diameter. With the 20s and all else the same, your acceleration/speedo will be a little off and they are heavier (if looking at same wheel).

No more protection for either wheel.

FYI...I just ordered the 19s.

Ryan

Manaray

Compared to the 19's, the 20's will show a 3.9% speedo error...so when your speedo is showing 60 MPH, you're actually going 62.3 MPH (I used the front tire measurements)

Compared to stock 17's (which is the smallest setup in terms of overall diameter of the tire), a 20" setup will be 5.6% off (so it shows 60 MPH but you're really going 63.4 MPH)

The stock 16's and 19" are so close, they will give a negligible error...

Here's some numbers if you'd like to do the math yourself...

Stock 16" GS tire = 225/55-16 = 25.7" Diameter
Stock 17" GS tire = 235/45-17 = 25.3" Diameter

19" Front = 245/35-19 = 25.8" Diameter
19" Rear = 275/30-19 = 25.5" DIameter

20" Front = 245/35-20 = 26.8" Diameter
20" Rear = 275/30-20 = 26.5" DIameter

J.P.

"Why wouldn't you just go with 20"s vs 19"s unless there is a big price difference in the tires/wheels?"

I like the look of 19's better sometimes. It seems you can drop the car more on 19's, maybe I am wrong.

GS4Will

hmm...manaray, on the 16s, i think it is 25.74" diameter, hence, as you said, 19s are closest...

GS4Will

btw, not that 19s would look bad, but 20s do look awesome....it all depends what you are looking for and what your budget is..

tyre and wheel combo, depends on make, model and finish, could range from ~$400 and up in difference..

zushwa

You're right, you probably can lower a car more (offsets and other variables being equal) but isn't that the advantage of 20's?? With a slightly larger than OEM diameter you can achieve "the look" without lowering it as much. This is especially important for those who don't have coilovers or a dramatically low shock/spring combo.

As for the other things mentioned (price, speedometer, wheel protection from the tire etc.) I have taken all that into consideration and 20's are the best bet FOR ME.

Manaray

gs4will - heheeh..yeah, 25.7"...typo...eh, it was 3AM...

bigbllr2000

my only ? is dont 19's ride a little better than 20's and there both just as expensive and you dont get the rub look at cutting fender thread and you'll see what i mean ... thats the only reason im going with 19's dont want 2 cut anything ,20's i've found seem to be sorta cheaper.

Manaray

I have 20's and I don't rub at all...no fender mods whatsoever...

One reason to get 19's is sometimes you REALLY like a design and it doesn't come in 20"...many Japanese wheels are NOT available in 20"...

bigbllr2000

what size tire are you running and what offset is your rims ?

Manaray

20 x 8.5" +37 High Disk
245/35-20


20 x 9.5" +38 Normal Disk
275/30-20

bigbllr2000

first time i heard of high disc, but i also know 245's dont rub in the front. what kinda of rims are you ri\unning any pic i like pics?