Wheel and tire weight

[FiveCX-5]

Hello everybody, with the help of you I want to make a list of wheeltypes and tire combinations for the Mazda CX-5......for example 17" 18" 19" 20" 21"and even 22"
Because wheels are heavier when the rims getting bigger, not always (rotary forged) but often it is.........
The OEM wheel for the Cx-5 is 17" 7x17 ET 50 with 225/65/17 Yokohama Geolander: weight 21.3 Kg or 46,9 Lb

It`s very important for the steering and lower unsprung weight of the coach for roadhandling.........The lower (weight) you can get, the better it is..............(gasmiliage and acceleration)
Other brands of wheels (cast , slow forming or RF are welcome....) (drive)

I`ll get off :
a) Oxxo Carpo 20 x 8.5 ET 40 with 245/45/20 = 25.8 Kg or 56.8 Lb (this is very light for a cast wheel !) (lighter than the OEM 19")
b) OEM wheel 19 x 7 ET 50 with 225/55/19 = 27,2 Kg or 60 Lb (this is common weight, but heavier than OEM 17") (thanks to Chris-Top-Her...)
c) OEM wheel 17 x 7 ET 50 with 225/65/17 = 21,3 Kg or 47 Lb (this is common weight and original)

 

[Ecf]

Hello everybody, with the help of you I want to make a list of wheeltypes and tire combinations for the Mazda CX-5......for example 17" 18" 19" 20" 21"and even 22"
Because wheels are heavier when the rims getting bigger, not always (rotary forged) but often it is.........
The OEM wheel for the Cx-5 is 17" 7x17 ET 50 with 225/65/17 Yokohama Geolander: weight 21.3 Kg or 46,9 Lb

It`s very important for the steering and lower unsprung weight of the coach for roadhandling.........The lower (weight) you can get, the better it is..............(gasmiliage and acceleration)
Other brands of wheels (cast , slow forming or RF are welcome....) (drive)

I`ll get off :
a) Oxxo Carpo 20 x 8.5 ET 40 with 245/45/20 = 25.8 Kg or 56.8 Lb (this is very light for a cast wheel !) (lighter than the OEM 19")
b) OEM wheel 19 x 7 ET 50 with 225/55/19 = 27,2 Kg or 60 Lb (this is common weight, but heavier than OEM 17") (thanks to Chris-Top-Her...)
c) OEM wheel 17 x 7 ET 50 with 225/65/17 = 21,3 Kg or 47 Lb (this is common weight and original)

18 inch Enkei fujin at 18.8 lbs with 235/50 pure contacts at 24 lbs. together 42 lbs.

 

[V8toilet]

So the OEM 19" wheels are 13 lbs heavier each???? WOW, that’s 52 lbs more un-sprung weight!

This is an interesting thread.

 

[FiveCX-5]

Indeed, so if you have the plan to get bigger wheels on your CX-5, remind you that increases gasmiliage and un-sprung weight ! So you see in the list above that a 20 inch rim can be lighter than the 19 inch OEM wheel of the CX-5.
If you don`t want to spoil the Skyactive Tech, you`ll have to be clever to choose your new rim !!!

Of course the Rotary Forged and slow casting wheels are much lighter than normaly cast wheels, but more expensive !!! (The OEM wheels 17 and 19 are normaly cast types)

 

[OSCORP]

My wheels weight the same as the stock 19" according to your post 60lbs. and they are 20x9x30 with 265/40r20.
Im guessing im ok then! the look I wanted and no weight change.

 

[tibimakai]

Lately, I was wondering if it's worth carrying the spare wheel. Some manufacturers are not even selling them with the car, it's an option. That would help with the weight. We have free roadside assistance, I'm also member of the AAA. We should measure that wheel too.

 

[MikeM.]

Lately, I was wondering if it's worth carrying the spare wheel. Some manufacturers are not even selling them with the car, it's an option. That would help with the weight. We have free roadside assistance, I'm also member of the AAA. We should measure that wheel too.

You could save a few lbs. by removing the spare but the benefits would be minimal because it's not unsprung weight and the spare tire doesn't spin up every time you step on the gas. The advantages of lighter wheels are three-fold:


1) Less rotational inertia. This makes your car accelerate faster with less wasted fuel. It also reduces wear on your brakes and discs every time you slow down. It also reduces gyroscopic forces that interfere with quick direction changes.

2) Less unsprung weight. This reduces the energy that must be absorbed by the springs and dampers on bumpy roads. As the wheel moves through it's suspension travel, the suspension is attempting to keep the wheel on the driving surface. A heavier wheel requires more compression and rebound damping to keep good contact with an irregular road surface. More damping creates more heat in the dampers and this heat is wasted energy (yes, it impacts your mpg slightly). More damping also makes the ride feel less supple.


3) Less weight.

Removing the spare only provides benefit #3 and yet, you lose the ability to continue your journey without outside assistance if you get a flat. I don't find that a good trade-off so I'll be keeping my spare.

 

[MikeM.]

So the OEM 19" wheels are 13 lbs heavier each???? WOW, that’s 52 lbs more un-sprung weight!

This is an interesting thread.

Yes! I think the slower acceleration of the 19" wheels was a contributing factor to the perception echoed in many early reviews that the 2.0 engine was under-powered. Almost every review used the GT model with the heavier wheels.

I have the AWD 2.0L with wheels considerably lighter than both the 17" & 19" OEM wheels and my car feels positively zippy.

 

[V8toilet]

Hey Mike I counted 5 reasons there, kidding aside you mentioned at some point what the weight was of your wheels + tire combo. Do you mind putting that up again?

 

[FiveCX-5]

So let`s resume, we have.......

a) Oxxo Carpo 20 x 8.5 ET 40 with 245/45/20 = 25.8 Kg or 56.8 Lb (this is very light for a cast wheel !) (lighter than the OEM 19")
b) OEM wheel 19 x 7 ET 50 with 225/55/19 = 27,2 Kg or 60 Lb (this is common weight, but heavier than OEM 17") (thanks to Chris-Top-Her...)
c) OEM wheel 17 x 7 ET 50 with 225/65/17 = 21,3 Kg or 47 Lb (this is common weight and original)
d) Enkei Fujin 18 x 8 ET 50 with 235/50/18 = 19 Kg or 42 LB ???

@ecf : what is the J of the wheel, 7.5 J or 8 or 8.5 ?
Can we make the list more longer ?

 

[Ecf]

So let`s resume, we have.......

a) Oxxo Carpo 20 x 8.5 ET 40 with 245/45/20 = 25.8 Kg or 56.8 Lb (this is very light for a cast wheel !) (lighter than the OEM 19")
b) OEM wheel 19 x 7 ET 50 with 225/55/19 = 27,2 Kg or 60 Lb (this is common weight, but heavier than OEM 17") (thanks to Chris-Top-Her...)
c) OEM wheel 17 x 7 ET 50 with 225/65/17 = 21,3 Kg or 47 Lb (this is common weight and original)
d) Enkei Fujin 18 x 8 ET ? with 235/50/18 = 19 Kg or 42 LB ???

@ecf : what is the J of the wheel, 7.5 J or 8 or 8.5 ?
Can we make the list more longer ?

Don't know if that link will work, but they are 8 inches wide with a 50mm offset. All the lighter stuff is bladed with not enough visual weight for me, and/or a lot more expensive. Still trying to make the finances work for car at the lowest price point: Sport 2.0 manual.

Rationalizing the wheels based on a slightly smaller diameter improving the drive ratio 98.6% for acceleration and reducing the effective frontal area some amount by lowering 0.2 inches to hold even on the mileage and the 5 lbs per corner should help too.

 

[FiveCX-5]

I think the weight is just the wheel alone........or it`s complete with the tyre ? Than 42 Lb is very light !!!

 

[Ecf]

I think the weight is just the wheel alone........or it`s complete with the tyre ? Than 42 Lb is very light !!!

42 lbs is complete assembly wheel and tire.

 

[Ecf]

42 lbs is complete assembly wheel and tire.

That is supposed to be 235/55 18 tire with a 100V load rating and 28.2 inch diameter at 24 lbs. Sorry for the diameter typo.

 

[Ecf]

Try a General RT43 225/65 17 tire with a 102H load rating and 28.5 inch diameter at 25 lbs. and Enkei Fujin 7.5 x 17 at 16.5 lbs and you get 41.5lbs for less money.