help with rims?

Question

ok iv i have like 17's on a car and i get 22's will my speedometer still be correct? if not how do i fix it?

Answer 1

In most cases, the change to a different size tire/wheel will produce only a negligible difference in the gear ratio. If the change is significant however, you may want to make other changes to keep the gear ratios similar to the way the manufacturer intended. A good example of a radical change is adding offroad tires to a truck.

The easiest way to change the overall gear ratio is to change the gears in the differential. In some cases, aftermarket suppliers offer the necessary parts and often the vehicles' manufacturer has an excellent selection available. If you are on a budget, a little research will probably reveal that your vehicle was available with a number of differential ratios. Different engines and transmissions, even the model year were equipped with differential ratios that sutied various conditions. If that is the case, a little searching of automobile wrecking yards can produce bargains.

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Answer 2

Plus sizing will allow you to change your tire and rim package without changing the overall diameter of the two. If you plus size, you will not need to correct your speedometer. Normally you add a bigger rim but get lower profile tires.

If you want to get a bigger rim but keep similar side wall size/profiles, you will end up with a decrease in actual miles registered as traveled and an inaccurate speedometer.

Since the car seems to have come with 17's, I'm assuming that it actually has the torque to push something that big from a standing start, so gear issues should not be a problem.

If you merely plus size, you do not need to fix the problem. Check if the tire you are replacing and the new tire have the EXACT SAME DIAMETER. If the tires you are putting on are bigger than the ones you are replacing, you will need to adjust it with an aftermarket part, depending on the vehicle. Normally it is a small computer or computer piggy back system that attaches to your current vehicle to adjust it while running. Not all such things however exist for all vehicles.

Answer 3

The only part of the switch that matters is the overall diameter of the tires outer surface. Go to www.tirerack.com and enter both the 17 inch and te 22inch tires and click on specs. That will tell you how many rotations each tire makes in one mile and the average diameter. If the 22inch are low profile they might not affect the speedometer enough to make a difference.

BUT, I gotta warn you, the 22inch super low profiles like 260/40/22 will be terribly stiff riding. You will feel like you are in a truck.

If they throw off the accuracy of the speedo, you will have to get the dealer to furnish a drive for the speedo that has a different gearing.

Answer 4

First off, such an "upgrade" is retarded, but if your hell bent on doing it because of some misplaced feelings of inadequacy then some more information is needed for you to get your answer;

What kind of vehicle is it (year/make/model)?

What is the OE tire and rim size?

Answer 5

Your speedometer will be off, but not by a whole lot, maybe like one or two notches off of what its supposed to be. how to fix it, however, you might want to talk to a professional mechanic.