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Thread: Effect of weight of rim on top speed and consumption.

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    Default Effect of weight of rim on top speed and consumption.

    I just want to know that what will be the effect of different weight rims like, alloy/ steel/ chrome on torque/ top speed and suspension of a cruiser?

    Also please let me know as what is the normal weight of these single rims without tires?


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    Quote Originally Posted by noman8ff View Post
    I just want to know that what will be the effect of different weight rims like, alloy/ steel/ chrome on torque/ top speed and suspension of a cruiser?

    Also please let me know as what is the normal weight of these single rims without tires?
    Torque is the rotational force produced by the engine: that obviously has nothing to do with the weight of the wheels and will remain unaffected. The amount of torque available to turn the wheels depends on the gear ratios, thus it will remain unaffected too.

    Top speed will be determined by the effective gearing ratio in top gear and the horsepower of the engine. If the overall diameter of the wheel and tire assembly remains the same then the effective gearing will not change, and if the vehicle has the proper engine and aerodynamic characteristics, then the top speed will remain the same.

    However, two things will be affected: a) the rotational inertia of the drivetrain, which is inversely related to the acceleration, i.e a heavier set of wheels will increase the rotational inertia and this will slow down acceleration, and b) the ratio of unsprung mass to sprung mass will increase, decreasing the compliance of the suspension. Taken together, a heavier set of wheels and tires, everything else remaining the same, will cause a vehicle to accelerate more slowly and crash into bumps more harshly.

    For your last question, I need to know what you mean by "cruiser".

    Generally speaking, steel wheels are heavier than their equivalent alloy counterparts. With alloy wheels, it depends on how the alloy wheels are formed. Generally cast alloys as heavier than spun cast alloys, which are heavier than forged alloys which are heavier than drop forged alloys which are heavier than three piece alloys for a given size and width. Chrome is just a type of finish and generally adds only a little bit of weight to the wheel.

    For wheels and tires, generally lighter weights will give better results for road cars. Off-road vehciles have different requirements and generally not as badly affected by this variation.

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    ^ great explanation

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    good expln . keep up the good work

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    Actually wheel weight is what is known as "unsprung weight" and it has more affect on the performance than say adding the same amount inside the car. I would have to look it up in one of my books but as far as I can remember, adding one lb extra weight in wheels is like adding 5 lbs inside the car. (I am not sure if the ratio is 3:1 or 5:1 wld have to look it up)

    So yes it does have an affect on performance and consumption.
    Hassan
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    Quote Originally Posted by noman8ff View Post
    I just want to know that what will be the effect of different weight rims like, alloy/ steel/ chrome on torque/ top speed and suspension of a cruiser?
    On a 60 series TLC, I don't think the rim weight will make a terrible difference. Given the vehicle's own heavy weight a few pounds here or there will not really rock the boat too much.

    In my experience of the FSJ Wagoneer going from narrow steel rims to wide steel rims and then to alloy rims, the most notable difference was on the feel of the steering and probably on the handling.

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    increasing your unsprung weight will ruin your handling, increase the wear on your drivetrain & steering components, prematurely wear out your suspension bushes, slow your acceleration, increase braking distances etc...

    nothing good comes from increasing your unsprung weight
    1. A car is only worth what someone is willing to pay for it, 2. Resale wont save your life in an accident, 3. Genius has limits, stupidity has none, 4. Never argue with an idiot, they will bring you down to their level & beat you with experience, 5. Growing old beats the alternative -- dying young! 6. انّا للہ و انّا الیہ راجعون

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    Quote Originally Posted by Storm View Post
    ....nothing good comes from increasing your unsprung weight
    Couldn't agree more....this is pure bad-*** territory

    Effect of weight of rim on top speed and consumption. - filephp?id2750

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    Please keep in mind that requirements of dedicated off-roaders can be different.

    These are usually slow vehicles with a lot of low rpm torque, as well as reduction gearing in the transfer case. In this situation, the addition of bigger (and heavier) tire/wheel combinations can provide an easy way of adding ground clearance and, providing better traction. However, this usually means a compromise of on-road performance, which can be substantial.

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    Smile

    excellent post by @ nomanff great work
    http://www.vehiclepdf.com/

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    That was great information. I am quite clear now about the issue.
    Here i would also like the comments and expert opinion of everyone about my exact problem.
    When i purchased my land cruiser, it had its original stock 16" 5.5" wide steel rims which were very heavy and had very small tyres something like 215 65 R 16. So i changed them and purchased brand new tyres 31 X 10.50 R 15, and kabli alloy rims of 15" 8.5" wide. Remember, the weight of my cruiser is around 2500 KGs.

    The result was as follows

    Advantages
    1. Nice looking overall
    2. Light weight, giving good speed, torque, comfort and less wear and tear of the suspension

    Disadvantages
    1. Not giving a stock look, remember my cruiser is 100% stock in original form.
    2. Might be the rims are not as strong as the steel ones were (remember 2500 KGs)
    3. The tyres are being stretched and since the rims are 8.5" wide so there might be some hardening of steering.
    4. The tyres throw mud on doors as they are a bit out from the body.

    Now keeping in view the above, please advise me as
    1. Should i keep the existing set.
    2. Should i go for bigger tyres with the original 16" steel rims.
    3. Should i just change the rims only and buy alloy rims of about 7" or 7.5" wide with the existing tyres.

    Remember, beauty is not at all important. Also see the below pic.Effect of weight of rim on top speed and consumption -78640

    Effect of weight of rim on top speed and consumption -78641

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    naman8ff: First of all, you have a great vehicle. My compliments.

    I can give you information from my point of view, but I do not know the local situation and thus the applicability of what I might say. We should wait for the local experts to provide their advice.

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    @ VCheng, thanks brother, if you are a true lover of this brand, do visit my post, "What about the condition of this 62??????????". I think it is on page no 5.

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    noman8ff: I just went throught that thread. What a find! If you take proper care of this one, it will last you a long time. This is one of the true classic TLCs.

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    Well, nobody else has posted until now, but I have some information that the OP may find useful.

    I would suggest 16x8 wheels (offset between 0 and -10 mm, with 6-139 bolt pattern), and mounting 235/70R16 tires on them. This size wheel will weigh between 20 to 26 lbs approximately, plus the weight of the tire chosen, each. This type of assembly will give you about 700 revolutions per mile to keep the speedometer error within reason over stock. Please make sure that you get the proper lug nuts and have a plan for changing the spare if you get a set of four rather than five.

    I do not know whether something like this will be available at a price that is acceptable, but good luck anyway.

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    My two cents... keep in mind the bigger the tires, the worst your general gas mileage will turn out to be. The amount of gas mileage drop also depends on how robust the engine is. Going from 235/75/15's to a set of 33x12.50x15's ended up taking away approx 7 miles per gallon with my driving style on my 3.0L Toyota 4Runner. At the same time, upgrading to 305x70x16's from 265x70x16's on my Double cab Tacoma 3.4L only cost me about 3-4 mpg, again with my driving style. I understand that these are pretty major size changes and were accommodated solely with the help of a suspension and body lift but just goes to accentuate the point.

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    noman8ff: So what have you done for the wheels and tires, if anything?

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    Brother i selected two sets from the market but both were defected. So finding another set of 15' not wider than 7.5". Lets see what happens.

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    heavy rims , first effect Slow PickUp , More fuel consumption to gain a momentum ,
    Decreases slight Break pads time , makes car to stop on more longer distance at high speed it will make more pressure between Road and Type Grip ( not air pressure )
    the centrifugal force at the circumference on wheels , hard cutting

    Light Rims , Benefit all the way (only in case , you will get slight burnout on begining If you want to reach to get speed from 0km.h every quick
    other wise keep you vehicle with less load as much as you can
    Trying to be real slow turn up the bass real low get the sounds that head low tune the channel of EXO gonna take to the level where speaker streams ,ready to rattle up the box

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    some of you maybe right and some of you maybe wrong, but i agree with you all

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