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Old 03-28-2004, 02:43 AM   #1 (permalink)
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Question Light Rims = Better Gas Mileage?

What's up everyone...it's been a while -

Just like the title says, will putting on some lightweight rims result in better gas mileage over stock? I know for a fact that rolling on heavy rims sucks up mileage. (That's why I'm getting rid of my 21 lb. Monsoons for a set of 13.5 lb. Slipstreams ) PLEASE no smart-a** responses; common sense isn't always correct.

If anyone has personal experience with this, let me know how it's worked out for you. Thanks!
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Old 03-28-2004, 03:11 AM   #2 (permalink)
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personally i saw no difference in mileage on my teg when i opted for my 17" rims..

then again they are 15 lbs each hehe.

air pressure is a better determinate than rim size/weight for mileage imo
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Old 03-28-2004, 06:17 AM   #3 (permalink)
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Yeah its kinda funny. Rims can store energy just like the flywheel , so it all really depends. Im guessing the weight savings alone will equal better mpg and speed.

But im not sure if the actual rim being lighter would always cause for better mpg , because at speed the heavier rim wont slow down as much..im not an expert at physics. But im pretty good at working out weird crap like this.

Im thinking if you stop and go a lot , the lighter rim will get better mpg , but if you cruise on the highway the heavier rim just might get better mpg. Im just kinda hypothesising here because with lightweight flywheel and stock flywheel on the same car , if it were to go up a hill , the one with the heavy flywheel , will go up faster , while downhill the lighter one will catch back up and once level they will be at the exact same spot. Im pretty sure thats a good explanation of how flywheels and weight savings on the drivetrain work.

A heavier flywheel can make for a easier launch as it has more engery to push with. While a lightweight flywheel has to be revved up in order to get the same movement going. They basically change how the car works.....as does getting lighter rims.

But another good thing for lightweight rims is they put less weight on the suspension , so there is less weight acting upon them so they can do their job more efficiently. Always a plus....

If there were any I would buy some carbon suspension arms. Them shizzles would own...suspension weight reduction feels like no other.
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Old 03-28-2004, 10:42 AM   #4 (permalink)
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If the mileage increases from using lighter rims the amount is going to be measured in 100ths of a mile per gallon. You won't see a significant increase. The best way to optimize mileage would be to make sure your tires are properly inflated.
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Old 03-28-2004, 09:47 PM   #5 (permalink)
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Quote:
Originally Posted by mike_sho
Yeah its kinda funny. Rims can store energy just like the flywheel , so it all really depends. Im guessing the weight savings alone will equal better mpg and speed.

But im not sure if the actual rim being lighter would always cause for better mpg , because at speed the heavier rim wont slow down as much..im not an expert at physics. But im pretty good at working out weird crap like this.

Im thinking if you stop and go a lot , the lighter rim will get better mpg , but if you cruise on the highway the heavier rim just might get better mpg. Im just kinda hypothesising here because with lightweight flywheel and stock flywheel on the same car , if it were to go up a hill , the one with the heavy flywheel , will go up faster , while downhill the lighter one will catch back up and once level they will be at the exact same spot. Im pretty sure thats a good explanation of how flywheels and weight savings on the drivetrain work.

A heavier flywheel can make for a easier launch as it has more engery to push with. While a lightweight flywheel has to be revved up in order to get the same movement going. They basically change how the car works.....as does getting lighter rims.

But another good thing for lightweight rims is they put less weight on the suspension , so there is less weight acting upon them so they can do their job more efficiently. Always a plus....

If there were any I would buy some carbon suspension arms. Them shizzles would own...suspension weight reduction feels like no other.
heh that flywheel lesson looks oddly familiar

if the difference is like 3 lbs/rim, mileage won't be very noticable

however, weight will play a factor in overall performance of the car....size is another factor....larger diameter rims will have a higher gyroscoping effect which will increase straight line stability, but sacrifices better cornering.....so why do you see race cars w/ big rims? to accomodate the HUGE brakes that stop their 400+hp engines.....tire sidewall is important in handling also blah blah....i guess it just depends on what you plan on doing w/ the car...
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Old 03-29-2004, 09:49 AM   #6 (permalink)
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Lighter rims will have better gas milage around town, and bigger heavier rims should have better milage on the highway.

lighter rims accelerate faster meaning your putting more power down to the wheels....you just made your drivetrain more efficient.
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Old 03-29-2004, 10:30 AM   #7 (permalink)
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Quote:
Originally Posted by lOOkatme
Lighter rims will have better gas milage around town, and bigger heavier rims should have better milage on the highway.

lighter rims accelerate faster meaning your putting more power down to the wheels....you just made your drivetrain more efficient.
Ahhh yes....that's another affect of the heavier rims...they have a higher inertia blah
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Old 03-29-2004, 12:35 PM   #8 (permalink)
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Lighter rims will have better gas milage around town, and bigger heavier rims should have better milage on the highway.
I just said that exact same thing in my post
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Old 03-29-2004, 12:37 PM   #9 (permalink)
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Quote:
Originally Posted by UltraMagneticAL
heh that flywheel lesson looks oddly familiar

if the difference is like 3 lbs/rim, mileage won't be very noticable

however, weight will play a factor in overall performance of the car....size is another factor....larger diameter rims will have a higher gyroscoping effect which will increase straight line stability, but sacrifices better cornering.....so why do you see race cars w/ big rims? to accomodate the HUGE brakes that stop their 400+hp engines.....tire sidewall is important in handling also blah blah....i guess it just depends on what you plan on doing w/ the car...
Why does the flywheel lesson look familiar? It came from the top of my head as does most my information. Ive said something similiar to this before in the forums?
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Old 03-29-2004, 12:44 PM   #10 (permalink)
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Quote:
Originally Posted by mike_sho
Why does the flywheel lesson look familiar? It came from the top of my head as does most my information. Ive said something similiar to this before in the forums?

Without saying the exact words, you just explained angular momentum. A heavier rim or one with a larger diameter has a greater moment of inertia. So if a car has a rim with a greater moment of inertia, it takes a greater force to accelerate at the same rate as a car with rims with lower moment of inertia.
On the other hand, while doing highway driving, the rim with the higher moment of inertia carries greater angular momentum, so forces from the road or wind resistance affect it less than a rim with a lower moment of inertia.
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Old 03-29-2004, 12:59 PM   #11 (permalink)
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The best way to optimize mileage would be to make sure your tires are properly inflated.
What is the best Tire pressure to run, to increase gas milage? im around psi on my 205-40-16's
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Old 03-29-2004, 01:18 PM   #12 (permalink)
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Quote:
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What is the best Tire pressure to run, to increase gas milage? im around psi on my 205-40-16's

you're around what psi on your tires?

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Old 03-29-2004, 01:48 PM   #13 (permalink)
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Quote:
Originally Posted by mike_sho
Why does the flywheel lesson look familiar? It came from the top of my head as does most my information. Ive said something similiar to this before in the forums?
pp10
http://www.superhonda.com/forum/showthread.php?t=146500
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Old 03-29-2004, 01:59 PM   #14 (permalink)
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Quote:
Originally Posted by Hooked_on4
What is the best Tire pressure to run, to increase gas milage? im around psi on my 205-40-16's

Whatever the manufacturer specs are for your car, which is on a sticker in the doorjamb. Your tire pressure should remain the same whether you have 195/65/14 or 205/40/16 tires. If you overinflate your tires to make them roll easier you will wear down the center of the tire, if you underinflate you wear down the edges. If you are tracking your car you may want to change pressures to suit your needs at the track.
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Old 03-29-2004, 02:08 PM   #15 (permalink)
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Quote:
Originally Posted by IntegraXTR
you're around what psi on your tires?


whoops, I ment 30 psi

And YourUserName its the same as OEM Spec???
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