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#1 (permalink) Old 05-23-2010, 10:30 AM
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Default Tire size

Hello all, I am new here and new to Kia. This is a good site with a lot of good information. I just purchased a 2002 Kia Sportage 4D, 2WD, Manual Transmission to tow behind my Moterhome. This car has 205-75-15 tires on it. I can get a good deal on some 235-75-15. Will these tires fit without rubbing and how much will they effect the speedometer and will they effect anything else. Also any info. on towing this car 4 wheels down would be appreciated.
Thanking you in advance for your help.
Pete
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#2 (permalink) Old 05-23-2010, 10:52 AM
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You can determine answers to most of your questions by using one of many tire size calculators on the internet. My favorite is at Tire size calculator. This particular one requires Java, which most folks have already. There are lots of these on the net, so simply Google "tire size calculator" to get a laundry list.

Will the tires rub? Without looking myself at this vintage Sportage I would guess not. The new tire is only 30mm wider, or 15mm (slightly less than 5/8") wider on each side. I would simply crawl around under the wheel wells with a short ruler and measure the possible pinch points. Be sure to look between the back side of the tires and the shock towers. The radius on the new tire is about 9/10" taller, but I recall the sportage does not have the tires tucked up in the fender wells very far. I still think the new tire will work.

If you are just looking to put a wider tire to put on the car, a 235/70-15 is a closer match to the rolling circumferance of the stock tire.

Last edited by Ken99; 05-23-2010 at 11:00 AM.
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#3 (permalink) Old 05-23-2010, 03:30 PM
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Originally Posted by Pete & Linda View Post
Hello all, I am new here and new to Kia. This is a good site with a lot of good information. I just purchased a 2002 Kia Sportage 4D, 2WD, Manual Transmission to tow behind my Moterhome. This car has 205-75-15 tires on it. I can get a good deal on some 235-75-15. Will these tires fit without rubbing and how much will they effect the speedometer and will they effect anything else. Also any info. on towing this car 4 wheels down would be appreciated.
Thanking you in advance for your help.
Pete
235 75's have not rubbed yet on my 2 door and I really like them for an overall oversized tire. Your speedometer will be off about 3-5 %. You will notice a slight loss of power. I know the 4x4 5 speeds were popular to tow behind motorhomes. I'll check my manual to see if the 2wd is the same.

Here is copy of 1996 Sportage manual page on towing



UPYOURKIA

White 96,4x4 w/Y2K motor,Warn man.hubs,K&N filter, 3row rad., twin 16" electric fans w/SPAL FAN-PWM, 1.4" body lift, 4" UPYOURKIA lift kit,265 75-16 TREADWRIGHT GUARD DOG TIRES ON 16" DC-2 wheels, 140 amp alt. dual batts.

Last edited by upyourkia; 05-23-2010 at 09:31 PM. Reason: added scan
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#4 (permalink) Old 05-31-2010, 03:09 AM
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So if going from 205 to 235 creates loss of power, what about going the other direction? Would a lower number maybe give a slight boost of power?

I own my second Sportage so I must really like em. I consider this one to be my second husband. Main issue with mine was the Timing Key(woodruff)
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#5 (permalink) Old 05-31-2010, 08:26 AM
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The power won't be affected at all. What you will notice is a slight reduction of torque at the tires. The larger diameter of the oversized tires will affect the drivetrain the same as going to a slightly lower number axle ratio.

In other words, going from a 205/75 to a 235/75 will add 75% of 30mm to the radius of the tire, 22.5mm. Since the original tire radius is 205 x .75 + 15/2 inches, or 367.5 mm, this adds 6%. This would be the same as going from a 4.00:1 axle ratio to a 3.76 ratio. I just pulled the axle ratio out of the air, I'd have to look up a Sporty's real number.

Net result: a little less acceleration (torque, not power) and probably the same top end. Top end is affected by total drag (air plus mechanical) vs. power (not torque) and probably isn't a real concern in a Sportage.

You may also note that same 6% in gas mileage increase.

If they don't rub, get 'em.

Norm
in beautiful Ham. Square NJ
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#6 (permalink) Old 05-31-2010, 11:47 AM
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You are correct in that power will not be affected. What I was trying to explain to the average member here, is that it will "feel" like you have less power (torque reduction). I stand corrected in my wording. Standard gearing is 4.78 on a Sportage in the US.

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