i really dont like how my tc revs so high at highway speeds and i was wondering if a bigger wheel would lower my rpms. has anyone noticed and difference in rpms who has 19''s?
thanks.

 

Bigger wheels do allow for a faster top speed with lower rpm's, but I doubt you'll notice anything significant...


how fast are you driving anyway?

 

I don't have 19"s but if you go with a wheel and tire combo that has an overall increase in diameter then yes RPMs will be lowered at respective speeds.

However if you are doing this to increase fuel economy it will be a little bit difficult, because you have to factor in increased rolling resistance and unsprung mass. So overall you may end up hurting your fuel economy.

 

Only if you dont buy tires to keep the diameter the same, but the changes are minute to say the least unless you went crazy big. You would not notice any difference at all. The car is geared low to allow it to accelerate quicker, nothing wrong with it running high rpm on the highway.

 

well, im not driving fast... like 75-80 on the highway. im not all that concerned about my fuel economy i was just curious if it would lower my rpms. i dont like my car screaming at like 4k rpms at 80 mph. i know that is how the car is geared i was just curious if putting 19"s on will reduce it any.

 

Not by anything significant, but ideally yes it would lower the RPMs by some.

 

also consider.. the new wheels add an additional weight to the car.
unless you get expensive wheels and tires, they're probably going to add a buttload of extra weight to the wheels.

id guess it would probably slow down your car if anything and hurt fuel economy.
not to forget throw off your speedometer and odometer.

cheers.

 

if anything it'll raise it because you have increased rotating mass and your engine has to work harder to overcome the friction of your larger tires.

so in a nutshell no. BUT if you have really lightweight wheels then its a possibility. but lightweight 19's are impossible to find and super $$$$$

 

LArger tires have less rolling resistance, not more. The weight is an issue, but is partially a blessing once up to speed because they work like a flywheel to hold that speed. Harder to spin up but also harder to slow down. The increase in diameter, however, equates to a proportional increase in tq needed to accelerate at the same level, which is a decrease in performance. But, on 19's you can run lower profile tires which will keep the diameter the same, which defeats the op's purpose anyway. But in the end a change this small wont have much effect overall.

 

i'm pretty sure when you have wider tires you have more contact area giving it more friction which means more resistance.

could be wrong tho

but yes to the OP it would be hardly noticible

 

We are talking about diameter though. Larger diameter means less rolling resistance. Now, if he also went to a 225 or someting like that, then he is adding width as well which will increase resistance, but probably no more than it is reduced by the larger diameter. Now, if he ran a lower profile, the widest part of the tire gets closer to the contact patch, meaning more rubber on the road, but again, th diameter change would probably negate that.

 

agreed well lets just say that if he wanted to lower his rpm's he'd have to get a lift kit and run 22's with giant mud tires that were as thin as a dragster's front.