- Size of rims and tires and the impact on performance and fuel consumption?

I warmly welcome. I have an Audi A4 B6 1.8T. Until now, I had 15 "rims and 195 65 tires. I got nice 17" rims. And listen how it is. Because, for example, for a 17 "I can choose tires such as 205 55, 215 50, 225 45. How is it for acceleration, combustion? I have never tested it. I'm not a physicist, these rims have 225 45 winter tires, but I don't know if this profile is an exaggeration to 1.8T 150KM? I do not know which summer to buy and whether to sell these for the winter and buy them with a smaller width and greater height.

Do you want to put summer tires on those 17 "?
If so, then only 205/50/17, otherwise the car will be terrible to drive.
Before mounting the tires, ask the vulcanizer to check that the rims are 100% simple because mounting low-profile tires on the curved rims will have significant consequences.

The wider the rubber, the greater the rolling resistance = greater fuel consumption.
Grip increases, and I will not mention the performance here.

Generally speaking, the rules are as follows:
The wider the tire, the higher the fuel consumption, but the better the traction.
Low profile tire has better cornering handling but low comfort (hard)
A car with summer tires will burn less (because the tire is harder)
The car on alloy rims is more comfortable and burns less and the suspension wears less (lower unsprung mass)
Acceleration depends on road conditions (surface, humidity)

http://www.opony.com.pl/narzedzia/zamienniki-opon/195/65r15/

Look, I realize that a wider profile = a better grip. It is logical that it is even harder to assign it. But how does this relate to speeding up? like a wider tire, theoretically it is harder to accelerate it, but less height. I feel sorry because I was buying a few rubbish and I got the rims very cheaply and the tires are free of charge for 7.7mm. The kit was also from the A4 B6 only that 3.0 gasoline 220Km. I am worried about the width, whether I start to drink a lot more on them and whether the performance drops.

Added after 11 [minutes]:

Kenworth 18 wrote:

Do you want to put summer tires on those 17 "?
If so, then only 205/50/17, otherwise the car will be terrible to drive

Sorry, you are right, I was wrong, I meant as you write and I want to buy summer ones. But I don't know whether to leave the tires for the winter now or sell the tires.

Put it on and drive. If you are dragged in ruts, the only salvation is to switch to a narrower replacement. The basis is driving comfort, not some burning or rolling resistance, because it's just gibberish from tire manufacturers. Of course you will save by pumping with higher tire pressure to reduce rolling resistance, but the ride will be uncomfortable and the tires will wear out faster.
The basis is simple rims and even, that is, not serrated tires.

gsekulski wrote:

like a wider tire, theoretically it is harder to accelerate it, but less height.

The height of the wheel matters, not the tire itself, and this one will be similar.
Acceleration may go down slightly, but you will take turns with a banana in your face.

Ask yourself, "Am I the master of the straight or the king of the turns?" And match the right tires with you.

I cannot imagine riding on narrow balloons, the advantage of the low and wide profile is so great that it is not worth paying attention to fuel consumption and performance. But that's just my opinion, because I like aggressive driving.

Such an example from life 20 years ago, my first low profile, I'm driving about 80 km / h and in the last moment I saw a hole so deep that I would have smashed the wheel 100% - and if I had serial balloons then I'm sure that I would not miss this hole - it was too close and too high speed. Imagine my surprise at how I managed to avoid this hole Since then, never have balloons.

Sorry, I was about to correct myself. The height of the wheel must be the same, otherwise the speedometer would cheat. This is, for example, 55 in tire size, which is the ratio of something there to something there. So, for example, visually or in comfort, what will be the difference between, for example, 45 and 50? You know, I'll tell you that, I don't care about very wide tires, for me, for example 205, it's not wide anymore. I care more about acceleration because I am often in Wawa and everyone who goes there knows how to move there, for example, with the lights or change lanes. These are 225 45 as between them and 205 50 there will be a very minimal difference in fuel consumption, acceleration and comfort, I will leave them for the winter and I will not change to other ones. Until now, I've always had 195 65 15 and haven't really gotten to the bottom of it.
On the one hand you are talking well, a smaller profile = a stiffer tire, i.e. better turns. But I am curious how it will be on unevenness ... that is, that I would not be thrown out like a gypsy on a wooden carriage?

Then put 205 and choose the correct height.
Said 55 is the height of the tire as a percentage of the width.
The wider the tire, the taller it will be, with the same (55) profile.

The main question: What is the width of the rim, because it may turn out that the 205 will barely fill the space there and will be stretched - read too narrow.

Thanks a lot, I learned about the topic. Actually 205 50 and that's the best for me. I can give, for example, 205 55, the comfort will certainly increase, but it will already cheat the speedometer and fuel consumption will increase.

Generally, the larger the diameter of the rim with the tire, the worse the acceleration and the greater Vmax.
Again, the very wide ones make a drama on the ruts. But 205 is still the optimum.
Speedometers are often too high, the size "a bit" larger can correct the indications.
Too large a size will cause speed reduction.
Take a ride with GPS and compare.

I was convinced that the GPS was lying. Usually the GPS works with an accuracy of several meters, so it will calculate the speed so accurately.

Karaczan wrote:

Generally, the larger the diameter of the rim with the tire, the worse the acceleration and the greater Vmax.

Provided you have enough power to close the tachometer in last gear. In 99.9% of the cases, you will not increase Vmax with the wheel diameter.

Shifted the rims today. And I drove a bit on a dirt road and somehow I did not feel that the comfort suffered compared to 15. But the car looks better. I will probably do as my friend wrote. I will buy the summer 205 50. I am selling these winter tires, they are expensive. I will leave them for the summer and those 15 for the winter. In total, you pay 60 Zeta twice a year and the rims suffer from it, so there is no point in selling them.

Reduced comfort is a myth created by builders who transport rubble with their wagon cars, with suspension on ties
If you have a suspension with no play, you will not feel too much loss of comfort, but the handling and appearance? Significantly :)

And the dirt road is absolutely not suitable for any comparisons. Drive onto a leaky asphalt road.

You were probably not on my dirt road, you will find any slack in the suspension there )) ranging from smooth paths to small ruts, to larger and such grooves as if a tank had passed through a caterpillar. But I will take a ride on some medium asphalt later. General even if it was better, as if less ruts were collected. Maybe because wider tires, I don't know. As for Acceleration, I choked him down and it's hard to say. I would have to take the stopwatch in my hand and then compare.
So far, I know one thing 100% that tires more expensive than 195 65.

It is a good decision to make the 15 "winter set and the 17" summer set. On the 225/45/17 size, if you use one, you will be dragged in the ruts left by the trucks and I am not writing this just to write it from my brother's experience. After switching to the 205/50/17 replacement, driving a car has become a pleasure, not a chore.

But what are you printing here, 205 is the minimum for 150KM and the weight of the car, the minimum for braking and accelerating without losing traction.

Added after 44 [seconds]:

Secondly, try on whether you will run out of twist.

gsekulski wrote:

You were probably not on my dirt road

It's not about the number and size of the holes. The dirt road dampens better, it is softer than asphalt and the holes are gentle, you have sharp ends in the asphalt, the asphalt somehow transfers it to the whole car. You should know it if you haven't been driving a car since yesterday.

Quote:

The car on alloy rims is more comfortable and burns less and the suspension wears less (lower unsprung mass)

Nonsense, the alloy wheels are much heavier than the steel ones in the same size.

Unless Chinese But the average / good alus cannot be lighter or even comparable.
Magnesia are light, but it is rare to find them.

I drove about 70 km on them today. And so ... A better road, i.e. made several years ago, with some unevenness and at 15 m it seems to be going better. but I came back on a worse road, i.e. bumps, patched, holes, etc. At 15 I always rode about 70 km / h on these asterisks 100 and it was better to go than 70 on 15 knots. It shook less, the car was clearly more stable, it looked stuck in the turns. Until now, I was always 15 and I was not interested in it, I just got it very cheap and I bought it. The brother only said that his friend bought 17 ki and wants to change it to 16 because it is impossible to go. I do not know if it is caused by the car, i.e. what is the suspension. But in the A4 B6, in my opinion, I would not come back for 15k. Unless I change the wishbones, I will change my mind Besides the appearance, it looks beautiful now. Previously, there was a profile of 195, now a change to 225, so I thought that a much wider profile would lose speed ... and I will tell you that one Ciort was going to get grandmother. When it accelerated, it accelerated, I would have to measure it with a stopwatch for hundredths of a second.
As for the tires, I will do as my friend writes 205 50. I will see more. What tires do you recommend? I have some expenses, and the insurer has not paid me for the repair yet. Anyone had some Chinese?

Strumien swiadomosc... wrote:

Secondly, try on whether you will run out of twist.

Everything ok with the twist. These are the rims also from the B6. In addition, I took the fender and the wheel arch from this car. the same stuff as in mine. So much for the rings ... with the replacement of screws because countless amounts of screws.

Welcome back. After about 2 weeks. I definitely recommend it to B6 17. The comfort has gone up, even on unevenness it is better to choose it somehow. I was convinced it would be the opposite. And fuel consumption has decreased significantly. I thought that the gas map was gone, but it's ok. I don't know what it is, but clearly I'm doing more KM. generally, everything is a plus.