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Discussion Starter #1
Good day to all, im planning on upgrading my stock 18 (225/55/18) inch rims to 20'inch but am a little baffled on how high tires should be? Many tire sites recommend 245/35/r20 while others recommend 245/40/r20. Can anybody with a working knowledge prescribe a best fit. Im asking this ?ion because im from the Caribbean and its a little difficult to get that kind of expertise knowledge from way down here. Also some of the roads are not the best and i would rather 245/40/r20 but the question is will i touch when i turn to much or would it touch the shock. Ur assistance / comments would be greatly appreciated.
 

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By rule of thumb, if you increase the Size by an inch the drop the profile by 10

so 17 s with 65 profile should be replace with 18 with 55 or 19 with 45`s or 20 with 35

But always worth getting a second opinion from a tyre specialist
 

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In addition to Rule of Thumb, there are many tire sizing calculators on the web; I like this one:

http://www.powerdog.com/tiresize.cgi

Carefully plug in your orig size and, that intended size of 245/40R20, and you will see the nominal
difference is negligible. Differences can vary from that data by tire brand,etc., but it gives a good
estimation, and with the 40 series you are in the ballpark: the calc shows rolling circum and dia
to be nuts on.

With all that said, I would have some slight concern on clearance, as the stock 18s come very close
to the rear point of the front wheel well, as you know. But, based on the data from the site, they
should clear. You will lose ~an inch of side wall, with the 40 series...I would not touch the 35 series, imo.

Having been on a couple dozen islands in the fine Caribbean, I wish you luck, road-wise. ;>)
GL, mD
 

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Information cited from http://www.all-tyres.com.ua/page2/news101/

If the 2010 hyundai tucson ix35 was fashioned from the hyundai ix-onic i did a little research and found out that the stock tires on the new ix-onic would be 275/40/R21 so i would think that my 245/40/R20 should fit perfectly?

Hyundai ix-onic ", which is intended in future to change on a conveyor belt" Tucson ". The car is equipped with a turbocharged engine of 1.6 liters GDi with gasoline direct injection. The car is equipped with a turbocharged engine of 1.6 liters GDi direct injection gasoline . It is expected that the serial copy of this model will be presented in Ukraine in May 2010. It is expected that the serial copy of this model will be presented in Ukraine in May 2010.

Production of "Hyundai Ix-Onic" starts in Korea in January-February 2010. Production of "Hyundai Ix-Onic" starts in Korea in January-February 2010. Pricing policy for a new concept punishment has not yet determined, but we know that the model will be approximately 10-15% more expensive than "Tucson". Pricing policy for a new concept-the punishment is not yet defined, but it is known that the model will be approximately 10-15% more expensive than "Tucson".

For the series model range of engines while also not been developed, but we know that it will be quite broad. For the series model range of engines while also not been developed, but we know that it will be quite broad. The car will be manned by three petrol engines from 1,6 to 2,4 liters., And two diesels - 1.6 and 2 liters. The car will be manned by three petrol engines from 1,6 to 2,4 liters., And two diesels - 1.6 and 2 liters. Provision 6 airbags and ABS. Provision six airbags and ABS. As an option, offers a panoramic roof and more advanced multimedia systems. As an option, offers a panoramic roof and more advanced multimedia systems. New Hyundai Ix-Onic also please the owners of large diameter wheels, it will be equipped with tires 275/40 ZR21 Dunlop SP sport Maxx in the top-end configuration.
 

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QUOTE (badbrowne @ Jul 28 2010, 09:15 AM) index.php?act=findpost&pid=345479
Information cited from http://www.all-tyres.com.ua/page2/news101/

If the 2010 hyundai tucson ix35 was fashioned from the hyundai ix-onic i did a little research and found out that the stock tires on the new ix-onic would be 275/40/R21 so i would think that my 245/40/R20 should fit perfectly?

Hyundai ix-onic ", which is intended in future to change on a conveyor belt" Tucson ". The car is equipped with a turbocharged engine of 1.6 liters GDi with gasoline direct injection. The car is equipped with a turbocharged engine of 1.6 liters GDi direct injection gasoline . It is expected that the serial copy of this model will be presented in Ukraine in May 2010. It is expected that the serial copy of this model will be presented in Ukraine in May 2010.

Production of "Hyundai Ix-Onic" starts in Korea in January-February 2010. Production of "Hyundai Ix-Onic" starts in Korea in January-February 2010. Pricing policy for a new concept punishment has not yet determined, but we know that the model will be approximately 10-15% more expensive than "Tucson". Pricing policy for a new concept-the punishment is not yet defined, but it is known that the model will be approximately 10-15% more expensive than "Tucson".

For the series model range of engines while also not been developed, but we know that it will be quite broad. For the series model range of engines while also not been developed, but we know that it will be quite broad. The car will be manned by three petrol engines from 1,6 to 2,4 liters., And two diesels - 1.6 and 2 liters. The car will be manned by three petrol engines from 1,6 to 2,4 liters., And two diesels - 1.6 and 2 liters. Provision 6 airbags and ABS. Provision six airbags and ABS. As an option, offers a panoramic roof and more advanced multimedia systems. As an option, offers a panoramic roof and more advanced multimedia systems. New Hyundai Ix-Onic also please the owners of large diameter wheels, it will be equipped with tires 275/40 ZR21 Dunlop SP sport Maxx in the top-end configuration.
Interesting thanks, but "Man, that sucker has got to ride hard with 21" tires" and, 1.6 litre engine? What's the deal with making the engines smaller, & smaller? It seems like it's riduculous for an SUV,,, of any size! Where's the torque, for loading up, towing, or off road?
 

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21" tires...if one peruses other car brand boards, it is apparent that 21s, at least in the US,
are offered only by a few mfg'ers, in a handful of sizes, and are hugely expensive.

That sidewall, or lack of, maybe a nice look on concept cars, absurd on real roads, imo.
I don't get 21s on any car, esp a Tuck or, Hyundai "sport" car. :puzzled:
 
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