Rim Sizes
- Thread starter BRP17
- 12 comments
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this is a tough 1 that i don't really know
but i do know that on a lot of the cars you are restricted to what size rims you can fit
say you put 15's on a car the tyres are massive but you put 18's on the tyre profile is tiny
thus giving the same rolling radius
im sure someone like T 12 the tuning god will be along soon to clear this up
but i do know that on a lot of the cars you are restricted to what size rims you can fit
say you put 15's on a car the tyres are massive but you put 18's on the tyre profile is tiny
thus giving the same rolling radius
im sure someone like T 12 the tuning god will be along soon to clear this up
- 291
- NITROVIOUS
Personally l think that for some cars rim size can make a difference.
my theory has to do with weight transfer, for example the 67 corvette handles a bit better with smaller rims on front, therefore transferring weight slightly towards front, which seems to produce more stability.
the only cars that l have found that respond well to this are rear wheel drive cars. an added benefit is that you can equalise vehicle ride height in tuning, then apply smaller rims to front larger to rear, creating a small amount of weight transfer.
my theory has to do with weight transfer, for example the 67 corvette handles a bit better with smaller rims on front, therefore transferring weight slightly towards front, which seems to produce more stability.
the only cars that l have found that respond well to this are rear wheel drive cars. an added benefit is that you can equalise vehicle ride height in tuning, then apply smaller rims to front larger to rear, creating a small amount of weight transfer.
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which goes back to my thery of rolling radius smaller wheel bigger tyre, bigger wheel smaller tyre = the same radius ?
to adjust weight transfer whats wrong with just adjusting the ride hight?
- 495
- TeamBRP
I'm trying to tune different cars, for different ratings.
Especially in 4 and 6, have to tune for power, and not suspension.
So if I can lower the front by rim size, it could help.
- 879
- MannyMoenjack1
I've found that rim size makes a difference too. In addition to what NITROVIOUS said, larger rims give you a shorter sidewall height on the tire. The shorter sidewall height will sharpen steering response and provide a stiffer ride. The shorter sidewall does have some drawbacks however. They tend to break loose more suddenly, less progressively than the taller sidewall height tires on the smaller rims, although it feels like overall grip levels are similar.
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i believe i said about tyre/side wall
and what you say about sharpening steering and sreering response is true
i'm just saying how does putting smaller wheel with a bigger profile tyre on the front lower it when the distance from floor to the top of the tyre would be the same as 1 with bigger wheel smaller tyre profile
- 879
- MannyMoenjack1
As far as I can tell it doesn't. The overall diameter of the wheel/tire doesn't change by plus-sizing or minus-sizing your wheels. Smaller wheel goes with a taller sidewall and vice versa.
But because the small wheel with the larger aspect tire tends to break loose less easily than the large wheel/lower aspect tire, you can help cut down understeer by going with smaller wheels in the front. I've also done the reverse by putting smaller wheels/taller tires on the back to get additional rear-end grip.
But I would do that only as a last resort on a car with chronic understeer or oversteer problems like the musclecars. Usually you can minimise understeer or oversteer in other ways. Only if you were working within a rating restriction (like 4.00, or 6.00) where you couldn't adjust the damping settings would it make much sense.
- 28,353
- Brooklyn, NY
- KR_Viper
- I Renown I
Well, let's see here, what can I say that already hasn't been said?
To be perfectly honest in this game you'll notice little to no difference in rim sizes. Traditionally, however, the larger the rim, the smaller the surface area is around said rim (sidewall), and larger rims also add more weight as there's more construction material being exhausted from the rim design. The weight won't really, if at all be noticeable on something as heavy as say, the Bugatti Veyron, but it will be noticeable on something far lighter such as the Lotus Elise, Exige, RX-7, etc...
The sidewall of the tire transfers, rather, it transmits the torque from the drive axle to the actual tread which gives you traction. Now, imagine with the larger rim turning into a tight hairpin; because the surface area is decreased, rolling resistance (in a sense) is increased. Rolling resistance is simply the resistance between the wheel and a flat surface. RR goes hand-in-hand with tire deformation. Tire pressure also plays a factor because traction is entirely dependent on the contact patch.
If you put everything together, you'll get an idea why you see tires with small rim sizes. This seems jumbled and I'm sorry if it is, I need a cup of coffee or something.
To be perfectly honest in this game you'll notice little to no difference in rim sizes. Traditionally, however, the larger the rim, the smaller the surface area is around said rim (sidewall), and larger rims also add more weight as there's more construction material being exhausted from the rim design. The weight won't really, if at all be noticeable on something as heavy as say, the Bugatti Veyron, but it will be noticeable on something far lighter such as the Lotus Elise, Exige, RX-7, etc...
The sidewall of the tire transfers, rather, it transmits the torque from the drive axle to the actual tread which gives you traction. Now, imagine with the larger rim turning into a tight hairpin; because the surface area is decreased, rolling resistance (in a sense) is increased. Rolling resistance is simply the resistance between the wheel and a flat surface. RR goes hand-in-hand with tire deformation. Tire pressure also plays a factor because traction is entirely dependent on the contact patch.
If you put everything together, you'll get an idea why you see tires with small rim sizes. This seems jumbled and I'm sorry if it is, I need a cup of coffee or something.
- 879
- MannyMoenjack1
Well, let's see here, what can I say that already hasn't been said?
To be perfectly honest in this game you'll notice little to no difference in rim sizes. Traditionally, however, the larger the rim, the smaller the surface area is around said rim (sidewall), and larger rims also add more weight as there's more construction material being exhausted from the rim design. The weight won't really, if at all be noticeable on something as heavy as say, the Bugatti Veyron, but it will be noticeable on something far lighter such as the Lotus Elise, Exige, RX-7, etc...
The sidewall of the tire transfers, rather, it transmits the torque from the drive axle to the actual tread which gives you traction. Now, imagine with the larger rim turning into a tight hairpin; because the surface area is decreased, rolling resistance (in a sense) is increased. Rolling resistance is simply the resistance between the wheel and a flat surface. RR goes hand-in-hand with tire deformation. Tire pressure also plays a factor because traction is entirely dependent on the contact patch.
If you put everything together, you'll get an idea why you see tires with small rim sizes. This seems jumbled and I'm sorry if it is, I need a cup of coffee or something.
I've wondered if there is a difference in wheel weights in this game. It's not listed anywhere I've seen and I wonder if Shift treats them all equally. (?)
I've always assumed the additional weight of the larger rims didn't matter, but boxox has surprised me several times by showing the code for things I didn't realize the game kept track of... Maybe the larger rims (being heavier in general) are a drawback in that respect.
It should keep track of it according to what you see in the files. Also if it's using physx to keep track of the contact patch and sidewall, the rim size effect on this would be trivial thing to calculate.
At any rate, it is several layers removed (controller, steering wheel, steering arm/caster, wheel/tyre/rim) from anything you can actually get feedback from in the game so the effect is only going to be a slight one and only around the edges, even if it's a system that works perfectly.
At any rate, it is several layers removed (controller, steering wheel, steering arm/caster, wheel/tyre/rim) from anything you can actually get feedback from in the game so the effect is only going to be a slight one and only around the edges, even if it's a system that works perfectly.
freshseth83
(Banned)
- 8,246
- freshseth83
i try to use 18's and no bigger, sometimes 19's are the smallest of a certain design that i want, i think on one of my cars (Merc SL) but the rest have 18's, the lotus i used 17's. I dont know if there is a difference but most racing series limit wheel size to 18's... it used to be 19's but they shrank an inch (LeMans, ALMS, FIA GT, LeMans series)
