modifying my focus

5

Asked by May 01, 2009 at 10:25 AM about the Ford Focus

Question type: Car Customization

i have a focus (1.6L) at home and i want to change its wheels but i keep hearing roumors that if you change the wheels you'll get less torque from the car since TORQUE = FORCE * PERPENDICULAR DISTANCE or something like that....

IS ALL THIS TRUE??
WHAT does ACTUALLY HAPPEN IF I PUT BIGGER WHEELS OR SMALLER ONES??

thanks, best regards

3 Answers

8,185

Normally the difference in moment/lever arm (perpendicular distance) of the rim is offset by lower profile tires so that's really a null issue. It does tend to increase increase the rotating mass and by changing tire profiles you change the vehicles dynamics (way it moves under various loads). Basically don't change it too much either way. If the rotating mass increase the amount of power necessary to alter rotation is increased. IE it's harder to stop and harder to go. But as to what you were asking directly, yes making the wheel/tire combo larger does change the amount of force the tire puts to the road (torque is constantly applied what changes is the resultant at the ground). I'm not sure how to make this make sense... I'm trying to shorten an explanation and making it make no sense... So big tire=less force moving faster small tire=more force moving slower The rule of thumb is to stay with an inch or two of stock rim size. And get a tire to match the outer diameter to stock (You can find calculators online to do this). If not your speedometer will read wrong. Go bigger it reads slow (you're going faster than the speedo say=tickets)

1 of 1 people found this helpful.
725

Adam is on the right track. Changing the diameter of your wheel (rim) is fine, so long as you adjust the tire size and profile to keep the overall diameter of the Wheel+tire close to stock. This is a very common practice and it is called plus-sizing your wheels. Adam also makes a good point about rotating mass. Increasing the amount of mass the car has to rotate makes it more difficult to accelerate and decelerate. In addition, the wheel and tire package is unsprung mass. The weight of the wheel and tire package has a big influence on how quickly and smoothly the cars suspension can react to steering or road inputs. When plus sizing a car's wheels, it is important to realize there are some downsides. Depending on your wheel and tire selection, wheel/tire package overall mass is an issue, ride quality will deteriorate because the lower profile tire has less compliance, and th ecost of low profile larger diameter tires increase rapidly as you go to bigger diameters. For a Ford Focus, I would suggest you go no bigger than 17"

1 of 1 people found this helpful.
8,185

^ Much better explanation :-D

Your Answer

Add photo

Related Questions

Focus

Looking for a Used Focus in your area?

CarGurus has 57,171 nationwide Focus listings starting at $1,095.

ZIP:

Search Ford Focus Questions

Ford Focus Experts

#1 Tom Demyan
Tom Demyan
Reputation 1,340
#2 dandyoun
dandyoun
Reputation 1,060
#3 Su'ad Barakat
Su'ad Barakat
Reputation 910
View All

Related Models For Sale

Used Ford Fusion
1,120 Great Deals out of 83,259 listings starting at $998
Used Honda Civic
656 Great Deals out of 88,603 listings starting at $995
Used Ford Fiesta
139 Great Deals out of 17,040 listings starting at $3,095
Used Ford Focus RS
5 Great Deals out of 2,509 listings starting at $33,402
Used Chevrolet Cruze
882 Great Deals out of 75,037 listings starting at $2,991
Used Ford Mustang
472 Great Deals out of 45,735 listings starting at $1,999
Used Toyota Corolla
785 Great Deals out of 73,830 listings starting at $1,995
Used Mazda MAZDA3
231 Great Deals out of 31,863 listings starting at $1,495
Used Honda Accord
813 Great Deals out of 84,287 listings starting at $1,050
Used Ford Escape
1,394 Great Deals out of 93,563 listings starting at $1,250
Used Hyundai Elantra
573 Great Deals out of 52,575 listings starting at $1,499
Used Toyota Camry
1,011 Great Deals out of 90,917 listings starting at $650
Used Volkswagen GTI
71 Great Deals out of 6,965 listings starting at $1,995
Used Nissan Altima
1,033 Great Deals out of 81,564 listings starting at $1,200
Used Volkswagen Jetta
446 Great Deals out of 40,941 listings starting at $950

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.