Wheel Size Questions

  • Thread starter Thread starter sagaper
  • 26 comments
  • 1,335 views
sagaper

sagaper

Messages
448
Norway
Oslo
Messages
sagaper
Have tried to search for answers, but I was only more confusion:dunce:

Is the wheel size only show? Or does it make any difference? If it makes any difference, please give a detailed answer. And a simple improving or worsens the the car answer...

Was the error with the wheel size is fixed with the 1.09 patch? I mean I have read so. But ask anyway, to get a confirmation
 
sagaper
Have tried to search for answers, but I was only more confusion:dunce:

Is the wheel size only show? Or does it make any difference? If it makes any difference, please give a detailed answer. And a simple improving or worsens the the car answer...

Was the error with the wheel size is fixed with the 1.09 patch? I mean I have read so. But ask anyway, to get a confirmation
Click to expand...
I haven't noticed any difference. There will probably be someone who posts saying that there is a difference, but even if there is, it would be extremely minimal.

And yes, that glitch was fixed.
 
Mini Stiggy
I haven't noticed any difference. There will probably be someone who posts saying that there is a difference, but even if there is, it would be extremely minimal.

And yes, that glitch was fixed.
Click to expand...


Do you change the wheel size on your cars?
 
There probably is a difference of handling with the wheel sizes. However it's so small that one couldn't immediately notice any difference.
 
As has been said above, if there is a difference it is barely perceivable.
I had some data showing what could be interpreted as tyre sidewall flex differences between different rim sizes pre 1.09 but I have not been able to replicate them since. 👍
 
I cant tell the difference & doubt there is one. Not tested properly but the wheel size seems to stay the same overall.
Bigger rims on lower profile tyres, could be checked by doing a top speed run.
If top speed remains the same gearing has not changed so they are the same size.

That only leaves difference's in overall weight of the wheel & sidewall flex which I doubt are modelled.

Off topic but @DolHaus
Thanks for your tuning guide that along with messing around with other peoples tunes suddenly switched on the light bulb with regards to tuning. Though I still find camber a hit & miss affair.
 
Wide Boy
I cant tell the difference & doubt there is one. Not tested properly but the wheel size seems to stay the same overall.
Bigger rims on lower profile tyres, could be checked by doing a top speed run.
If top speed remains the same gearing has not changed so they are the same size.

That only leaves difference's in overall weight of the wheel & sidewall flex which I doubt are modelled.

Off topic but @DolHaus
Thanks for your tuning guide that along with messing around with other peoples tunes suddenly switched on the light bulb with regards to tuning. Though I still find camber a hit & miss affair.
Click to expand...
No problem, glad it helped 👍

(and yes I agree, camber is hit and miss but lets not clutter up this thread with unrelated discussion :))
 
When I tested I used a car I was continually tuning for an online racing team, I was very familiar with it and could run super consistent laps. I took the car out and set a lap time using both standard and +2", I managed to get the laps within a few thousandths of each other and used the data logger to compare the data.
My findings were that according to the lateral G's the +2" rims followed a very linear pattern in terms of load, the standard size rims on the other hand followed the same basic load pattern but the wave appeared to be fluctuating slightly whilst following this course. I can only describe it as a very subtle waveform.
This said, the visceral effect on performance was not noticeable and I cannot say that one was better than the other 👍
 
Sorry for late response guys. Here's the test results
Car: Subaru Impreza WRX STi '07
Track: Laguna Seca
Tuning: None, aids off except ABS 1
Tires: CH

Standard size wheels: 1:46.891
+1 size: 1:46.869

As I said, it makes very little difference to the handling. Guess this is useful if you're really into time trials though.
 
Larger rim sizes do make small changes in the available gear ratios in custom transmissions on some cars, but I have not noticed changes in performance.
 
DolHaus
Do they? :confused:
Click to expand...
Yeah, I discovered this using the few Praiano tunes where he upgraded rims. Unless you buy the rims before using his gear ratios, some gears will be off by anywhere from 1-5 points. I don't remember which cars this applied to, but there were a few.
 
Jbaffoh
Yeah, I discovered this using the few Praiano tunes where he upgraded rims. Unless you buy the rims before using his gear ratios, some gears will be off by anywhere from 1-5 points. I don't remember which cars this applied to, but there were a few.
Click to expand...
If you can try to find an example then that would be great 👍

There are a few other things that can cause transmission setting issues similar to this (if the transmission is using maximum or minimum values in first or last gear then you can gain/lose a few points by setting the gears in the wrong order) but I've never seen it affected by rim size. I'm not saying it can't happen, you never can be sure with GT, I've just never seen it happen myself
 
I doubt there would be any changes to the transmission because you're only changing the wheel diameter not the tyre itself. As for handling there would barely be any difference on its own.
 
DolHaus
If you can try to find an example then that would be great 👍

There are a few other things that can cause transmission setting issues similar to this (if the transmission is using maximum or minimum values in first or last gear then you can gain/lose a few points by setting the gears in the wrong order) but I've never seen it affected by rim size. I'm not saying it can't happen, you never can be sure with GT, I've just never seen it happen myself
Click to expand...
Try Praiano's BMW 330i '05 tune. Do everything he says, but keep the stock rims. The transmission won't match until you use +1 rims.

There are other examples, but I'm too lazy to dig them up.
 
MSTER232
I doubt there would be any changes to the transmission because you're only changing the wheel diameter not the tyre itself. As for handling there would barely be any difference on its own.
Click to expand...
I agree with you about the handling, but you're dead wrong on the gearing. On some cars it makes a difference, and I've seen it several times.
 
Jbaffoh
Try Praiano's BMW 330i '05 tune. Do everything he says, but keep the stock rims. The transmission won't match until you use +1 rims.

There are other examples, but I'm too lazy to dig them up.
Click to expand...
I will have a look later and report back 👍
 
Jbaffoh
Try Praiano's BMW 330i '05 tune. Do everything he says, but keep the stock rims. The transmission won't match until you use +1 rims.

There are other examples, but I'm too lazy to dig them up.
Click to expand...
Seems far from pervasive, though--perhaps simply bugginess.
 
@Jbaffoh is correct. At least it was there in GT5. I believe there was a big argument where @Shells N Cheese was accused of hacking (correct me if I'm wrong), because he posted gear ratios that were not possible. It was then discovered that some different wheels gave different gear ratios.
 
Last edited:
A question to add to this thread is how some wheels cost more / twice as much?
You'll find BBS RS, OZ racing superforgiatta, some PDI wheels, (and maybe a few others) cost about twice as much.
Is it only because of the branding?
Occasionally I've thought a car seemed a little more stable from a wheel upgrade (and from these expensive wheels), but never been able to prove it with lap times etc, probably just an imaginary thing.
 
Adamaw11
A question to add to this thread is how some wheels cost more / twice as much?
You'll find BBS RS, OZ racing superforgiatta, some PDI wheels, (and maybe a few others) cost about twice as much.
Is it only because of the branding?
Occasionally I've thought a car seemed a little more stable from a wheel upgrade (and from these expensive wheels), but never been able to prove it with lap times etc, probably just an imaginary thing.
Click to expand...

It's really only noticeable in drag racing it was about .030 of a difference in GT5.
 

Latest Posts

Back