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TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

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Old April 27th, 2005, 08:55   #1
GolfTDI05
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Join Date: Apr 2005
Location: Indiana
Fuel Economy: 46//43/41
Default 15\" Wheels on a TDI vs. 16\", 17\" Wheels

Just bought a '05 Golf TDI GlS. I notice the TDI is the only model Golf with 15" wheels. Is this for better gas mileage?
My main question, if I put standard Golf 16" wheels, or even GTI 17" wheels on my TDI, will the speedometer read correctly? WIll this require some playing with the wheel sizes to get it to read correctly, or will the vehicle computer adjust to whatever wheel is put on the vehicle?
Any help would be appreciated! A newby to TDI's here........
Thanks!
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Old April 27th, 2005, 09:36   #2
ACHTUNG TDI
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Default Re: 15\" Wheels on a TDI vs. 16\", 17\" Wheels

The standard tire is 195 65 15". If you plus 1 the wheel size then the tire size is 205 55 16" and if you plus 2 the wheel size the tire is 225 45 17". All these tires have virtually the same diameter and circumference to keep your speedometer reading the same.
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Old April 27th, 2005, 09:41   #3
ruking
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Join Date: Mar 2003
Location: San Jose area, CA
Fuel Economy: 62/50/44mpg, normal commute range 48-52 mpg:09 Jetta TDI, 47/43/39, normal commute range 39 -43 mpg: 12 Touareg TDI, 39/31/29 mpg:
Default 15\" Wheels on a TDI vs. 16\", 17\" Wheels

The first answer is yes. The second answer/s is are a tad more qualified. You can use this handy dandy calculator to get you in the ballpark. When you use the calculator it will become apparent what variables you are solving for.

http://www.miata.net/garage/tirecalc.html

However as you probably know, manufacturing specs can and do vary.

What a lot of folks do not realize is the majority of combinations of wheel and tires are heavier than the stock set up. This change combined with wider tires can actually add up to 10 ft in stopping distance.
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Old April 27th, 2005, 09:48   #4
rdkern
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Join Date: May 2004
Location: Humboldt Co CA
Fuel Economy: A4 = wife drives it, don't know
Default Re: 15\" Wheels on a TDI vs. 16\", 17\" Wheels

Some say the wider tires also hit the fuel economy - but may be more fun around corners!
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Old April 27th, 2005, 10:33   #5
GolfTDI05
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Join Date: Apr 2005
Location: Indiana
Fuel Economy: 46//43/41
Default 15\" Wheels on a TDI vs. 16\", 17\" Wheels

Great! Thanks for the fast and good info. Lets see.....cash for bigger rims, more expensive tires, less gas milage vs. more corner fun....Hmmmmm... Kind of like the look better now of those 15" alloy rims that came on it. Thanks again!
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Old April 27th, 2005, 12:16   #6
ruking
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Join Date: Mar 2003
Location: San Jose area, CA
Fuel Economy: 62/50/44mpg, normal commute range 48-52 mpg:09 Jetta TDI, 47/43/39, normal commute range 39 -43 mpg: 12 Touareg TDI, 39/31/29 mpg:
Default 15\" Wheels on a TDI vs. 16\", 17\" Wheels

This is of course not to discourage you in any way BUT for example if you keep your stock rims there are tires (i.e., Yokahama EVS 100) that are a tad bigger, but fit on your stock rims and you will probably feel the "upgrade" from the OEM tires. So with the money you save NOT buying rims- you can buy new tires.
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Old April 27th, 2005, 17:15   #7
cmitchell
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Join Date: Jun 2002
Location: Southern Oregon Coast
Default 15\" Wheels on a TDI vs. 16\", 17\" Wheels

I'm running 16" VW OEM Montreal II's. I got better handling and noticed no difference in fuel economy. I'm running OEM Michelin Energys which replaced OEM Continentals... no measurable fuel economy difference. I just bought a new set of 2004 GTI 16" wheels (anyone know the name of these?) and brand new Continentals from someone on Vortex who wanted 18" wheels. I paid $450 for them... pretty good deal I think. I wanted something easier to clean.
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