There is nothing wrong with the OEM Wheels. Stop bashing on them.

Honda made a car that ran a 7:43 in one of the biggest race tracks and did as it comes from factory only with roll cage which made even heavier . If they put 20's its for a reason , i believe that the people that change out for 18's are just looking for better ride quality and a flush Lower look , tge wheels the ctr comes with are much stronger that any aftermarket wheel i personally like the oem wheels car has to much space for 18's the only way to make these look good is lowering springs which is another error as there will be more strain on the chocks and these will cost a good penny to replace

Harlaquin said:

Well not being scientific. But take a 18 inch wheel and a 20 inch wheel start at same spot on ground. And in one rotation the 20 inch wheel will have traveled further. So after say after a mile you will have used the same energy to travel a further distance. So if you traveled the same distance as the 18 you will have considerably less rotation and less energy expended. Its why you get odometers and speedometers screwed up when you change tire size.

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This is why there are 30 profile tires on the 20" rims and people run 40 profile tires on 18" rims. Your argument makes 0 sense.

Harlaquin said:

Well not being scientific. But take a 18 inch wheel and a 20 inch wheel start at same spot on ground. And in one rotation the 20 inch wheel will have traveled further. So after say after a mile you will have used the same energy to travel a further distance. So if you traveled the same distance as the 18 you will have considerably less rotation and less energy expended. Its why you get odometers and speedometers screwed up when you change tire size.

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but you spend additional energy turning a 20" wheel (62.8" circumference) a full rotation vs a full rotation of an 18" wheel (56.52" circumference) so you'd be moving the same distance with the same energy assuming the weights are the same.

Your also not adding the size of the tire. When people downsize, people usually use a bigger sidewall so the overall diameter with the tires wouldn't be too different whether you have 18" or a 20". (of course not all people but people generally do)

omar0123 said:

Honda made a car that ran a 7:43 in one of the biggest race tracks and did as it comes from factory only with roll cage which made even heavier . If they put 20's its for a reason , i believe that the people that change out for 18's are just looking for better ride quality and a flush Lower look , tge wheels the ctr comes with are much stronger that any aftermarket wheel i personally like the oem wheels car has to much space for 18's the only way to make these look good is lowering springs which is another error as there will be more strain on the chocks and these will cost a good penny to replace

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idk which aftermarket wheel you have seen but there are aftermarket wheels that are forged.
The car that ran a 7:43 at the nurburing also had stuff removed supposedly to counter the additional weight from the roll cage.

Harlaquin said:

Well not being scientific. But take a 18 inch wheel and a 20 inch wheel start at same spot on ground. And in one rotation the 20 inch wheel will have traveled further. So after say after a mile you will have used the same energy to travel a further distance. So if you traveled the same distance as the 18 you will have considerably less rotation and less energy expended. Its why you get odometers and speedometers screwed up when you change tire size.

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Well, when talking about 18 and 20 inch wheels, that size refers to the metal RIM-- not the outside diameter of the tire. In both cases, typically tires will be fitted with a sidewall, that will bring the wheel's Overall Diameter up to the correct specification for the car... and the the Odometer and speedometer will be correctly calibrated to the TIRE diameter.



What probably makes a difference is the weight of the wheel, and hence it's "moment of Inertia". Energy is needed to get the wheel to rotate and overcome this inertia, and when you brake, that stored energy in the wheel is converted to heat in the brakes, and lost to the system.

Harlaquin said:

Well not being scientific. But take a 18 inch wheel and a 20 inch wheel start at same spot on ground. And in one rotation the 20 inch wheel will have traveled further. So after say after a mile you will have used the same energy to travel a further distance. So if you traveled the same distance as the 18 you will have considerably less rotation and less energy expended. Its why you get odometers and speedometers screwed up when you change tire size.

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Wait... how does it take less energy to rotate a larger wheel than smaller wheel? Yes the larger wheel will have rotated less than the smaller wheel in the same distance but it will not have expanded lesser energy. Isn’t this why the mpg suffer if you have a larger wheel? Because it’s using more energy and fuel to rotate larger wheels?

tylermmorton said:

This is why there are 30 profile tires on the 20" rims and people run 40 profile tires on 18" rims. Your argument makes 0 sense.

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We ain't talking tires. We talking wheels. You put identical tires on a 18 and a 20 i promise you i travel further on the same gallon if gas there for using less energy in the forward travel if the car. This is why that loss of travel is being compensated for by a fatter tire on the 18s. But this thread is about wheels not tires and based on just the wheel i am absolutely correct.

RedFK8 said:

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yeah -- enjoy the Pop-corn... but at least (Hopefully), some are learning more about their cars by reading these posts !!
I have been around cars all my life, but still almost daily learn something new on this forum, that I did not know about the 10th Gen Civics.

Unfortunately, when you do not know a lot about a subject, - you also do not know just how much you DON'T know ...

( like how hard can Brain Surgery actually be ?? )

Prodigy71 said:

Wait... how does it take less energy to rotate a larger wheel than smaller wheel? Yes the larger wheel will have rotated less than the smaller larger in the same distance but it will not have expanded lesser energy. Isn’t this why the mpg suffer if you have a larger wheel? Because it’s using more energy and fuel to rotate larger wheels?

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Think about it in human terms. You and i are identical height, weight, leg length and stamina. Im on a bike with 20 inch wheels and your on a nike with say 12 inch wheels. We both have to travel 1 mile. You have to turn your wheels more in the same distance there for expending more energy and are gonna be way more tired after the mile then i am.

Harlaquin said:

Think about it in human terms. You and i are identical height, weight, leg length and stamina. Im on a bike with 20 inch wheels and your on a nike with say 12 inch wheels. We both have to travel 1 mile. You have to turn your wheels more in the same distance there for expending more energy and are gonna be way more tired after the mile then i am.

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If everything stays constant and only the wheel size is different then You do know that I’ll be accelerating faster than you right ?? Because it takes less energy to rotate a smaller wheel.. newtown second law.. you cannot say it takes the same energy to rotate wheels of different sizes

Prodigy71 said:

If everything stays constant and only the wheel size is different then You do know that I’ll be accelerating faster than you right ?? Because it takes less energy to rotate a smaller wheel.. newtown second law.. you cannot say it takes the same energy to rotate wheels of different sizes

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Strange. So then when i had my 20 inch wheels and my friend had 18 on his R and all else the same. I would always pull away from him in races. Before the 18s i didnt....hummmm

Harlaquin said:

Strange. So then when i had my 20 inch wheels and my friend had 18 on his R and all else the same. I would always pull away from him in races. Before the 18s i didnt....hummmm

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Too many variables that can affect your anecdote. Driver, tires, etc. but let’s get back to that bike analogy yeah?

SCOPESYS said:

yeah -- enjoy the Pop-corn... but at least (Hopefully), some are learning more about their cars by reading these posts !!
I have been around cars all my life, but still almost daily learn something new on this forum, that I did not know about the 10th Gen Civics.

Unfortunately, when you do not know a lot about a subject, - you also do not know just how much you DON'T know ...

( like how hard can Brain Surgery actually be ?? )

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Lol. Some of my posts I like to just get things going ill admit. But without them we wouldn't learn. I do hope people post and people learn. Myself included. But i will argue when real life proves google search wrong. And unfortunately 90 percent of peoples facts are just google searches and facebook groups which are bias as hell

Prodigy71 said:

Too many variables that can affect your anecdote. Driver, tires, etc. but let’s get back to that bike analogy yeah?

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Well nothing change till the 18s and the pulling away started at same time. So... and we did switch drivers same result my car was ahead. We got a good group we driver each others cars all the time

Harlaquin said:

Well nothing change till the 18s and the pulling away started at same time. So... and we did switch drivers same result my car was ahead. We got a good group we driver each others cars all the time

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Yes that might be true in your case but let’s not forget what’s the whole point of this debate.. you said it takes LESS forward energy with a larger wheel size to achieve the same distance.. lol so even if your car was faster on the 20 inch wheel vs your friend.. your car probably expanded more energy to do so