Custom wheels give all 4 tyres the same width.... changes grip and balance

[MadCyclist]

I could be wrong, but I seem to recall the Taurus SHO in the game was sold with 10mm wider tires in the front. Did PD model the car as such and would custom wheels give it wider rears?


And great vid Griffith500, I really want to try that.

 

[Amac500]

That's just horrible... Why would PD do this? My enthusiasm for this game is decreasing day by day... I just hope this only happens in certain cars. At least the Cizeta is one car that I wouldn't change the wheels of.

Stock Size:

+1 Inch:

+2 Inches:

The size looks the same for each custom tire, but I cannot say for sure if the handling is different for each size.

Yes the tires stay the same size. What is happening is that when you put bigger rims on your car you are getting lower profile tires. I'd be interested in research of how that effects handling. It should make the ride stiffer, which is faster but it won't ride bumps as well. Silverstone would be a good track to test this at. I would do it myself but the game's freezing broke my PS3 and I'm waiting on the replacement laser to read game discs.

 

[HuskyGT]

Yes the tires stay the same size. What is happening is that when you put bigger rims on your car you are getting lower profile tires. I'd be interested in research of how that effects handling. It should make the ride stiffer, which is faster but it won't ride bumps as well. Silverstone would be a good track to test this at. I would do it myself but the game's freezing broke my PS3 and I'm waiting on the replacement laser to read game discs.

I've been testing the game for the past week, and I can notice a difference in handling. In some cars more than others. It's not very noticeable in cars that have a very small offset(stagger, whatever you call it), like the BMW 135i, Hyundai Genesis, Nissan Fairlady Z, Mustang Boss 302 and you can even get away with it in the BMW M3 E92 and the M5. They will loose the rear end easier but it's avoidable even on Sport Hard tires. They are not undrivable and the skinny tire is barely noticeable.

Cars like the Dodge Viper SRT10/GTS/ACR, Cizeta Moroder V16T, modern Corvettes and any other powerful high performance sports cars, not only look awful with the rear skinny tires, but they become almost undrivable unless you use Sport Soft tires (not really a solution). It's even worst in powerful MR cars since they'll loose the rear even under braking in straight line.

As for the wheel size, I don't know if it affects the handling. I usually keep the stock size in all cases. I might increase the size 1 inch, but it's rare.

 

[Amac500]

I've been testing the game for the past week, and I can notice a difference in handling. In some cars more than others. It's not very noticeable in cars that have a very small offset(stagger, whatever you call it), like the BMW 135i, Hyundai Genesis, Nissan Fairlady Z, Mustang Boss 302 and you can even get away with it in the BMW M3 E92 and the M5. They will loose the rear end easier but it's avoidable even on Sport Hard tires. They are not undrivable and the skinny tire is barely noticeable.

Cars like the Dodge Viper SRT10/GTS/ACR, Cizeta Moroder V16T, modern Corvettes and any other powerful high performance sports cars, not only look awful with the rear skinny tires, but they become almost undrivable unless you use Sport Soft tires (not really a solution). It's even worst in powerful MR cars since they'll loose the rear even under braking in straight line.

As for the wheel size, I don't know if it affects the handling. I usually keep the stock size in all cases. I might increase the size 1 inch, but it's rare.

Yeah I don't doubt the narrower tire effects handling, it's if there is a difference between a custom wheel that is +0 and a custom wheel that is +2 I'm curious about. If that +2 does act like a low profile tire I would certainly go with them more often for performance sake.

Also I did add larger custom rims on the 458 and I didn't notice said handling symptoms of an MR car. I wonder if the bigger rim size improves the issue?

 

[Azabear6]

On a side note, it seems the Ford GT40 Road Car is completely unaffected as it retains its staggered stance.

I'll be on the look-out for other cars unaffected by this glitch.

The Ferrari F430 also

 

[Griffith500]

Off the top of my head, the California, 599 and E46 M3 are affected (I figure we could meet in the middle).

 

[MoonlightKids]

Any further update on this, I left most of my MR, FR cars untuned due to this

 

[Stotty]

Yeah I don't doubt the narrower tire effects handling, it's if there is a difference between a custom wheel that is +0 and a custom wheel that is +2 I'm curious about. If that +2 does act like a low profile tire I would certainly go with them more often for performance sake.

Also I did add larger custom rims on the 458 and I didn't notice said handling symptoms of an MR car. I wonder if the bigger rim size improves the issue?

All versions of custom rims suffer from the same tyre size issue (stock size, +1" & +2").

The 458 doesn't really handle like a MR... unlike something like an NSX, it has very little corner entry rotation and primarily understeers unless you're clumsy with the throttle.

 

[loopyloogrrr]

Haha wow haven't been on here for a while and I was thinking to myself. Am I the only the only person who finds when you increase the size of the rims the car is harder to control? And here you all are chatting about it. Will be taking them off my cars from now on my Jaguar I modified to compete in the national A Gt championship had 2 inch bigger rims and I couldn't figure out why the understeer was so bad. Even changed suspension set up and no luck. This is good hopefully no more severe understeer.

 

[raven214]

Any further update on this, I left most of my MR, FR cars untuned due to this

I was wondering this as well. Has PD said anything about this yet? I've put stock rims back on all my cars now but I really want to put something new on my RUFs.

 

[eSZee]

I was wondering this as well. Has PD said anything about this yet? I've put stock rims back on all my cars now but I really want to put something new on my RUFs.

We probably won't know til the patch itself is announced or til it hits out systems.

 

[CSLACR]

I want to test this, what's the most obvious (or close to it) car to use?

 

[Johnnypenso]

All versions of custom rims suffer from the same tyre size issue (stock size, +1" & +2").

The 458 doesn't really handle like a MR... unlike something like an NSX, it has very little corner entry rotation and primarily understeers unless you're clumsy with the throttle.

This was my question, thanks for the answer. How ironic is it that we get so many cool custom rim/size options but can't use them? Only PD....👎👎

 

[Tazz69]

CSLACR here ya go taken from this thread "I just tested the Cizeta V16 at High Speed Ring with my wheel(DFGT). Bone stock I managed a 1:13.116. With just the aftermarket rims I was able to hit 1:16.063."

 

[SiTheBugski]

I have just checked this out on a Ford GT '06, I purchased 2 of these beauties and equipped one with custom rims (+1 inch) and left the other one with standard rims. What was very strange in this is that when I took both cars to phototravel to compare tire width, the rear stock rims where wider than the custom +1's!! The custom rear rims were the same skinny width as in the front!


EDIT!
So I grabbed both cars to test the difference on High Speed Ring with Sports Hard Tires. For fairness, I decided to have 3 laps in both cars & picking the fastest lap of the 3 (BTW I'm using a DS3). So in terms of handling, the standard stock rimed GT understeered quite alot, no back end kicking out at all. The +1 however actually felt more balanced to me, it had less understeer and also the back did kick out but only very slightly during low speeds conners (on the S bends) but it was very very easy to control and had no problem with it, in fact it went around the bends faster by 5-7mph.

Here are the lap times for both
Ford GT Standard Rims: 1:10.073
Ford GT Custom +1 Inch Rims: 1:09.100

 

[Tazz69]

This is goo info on cars that push with stock rims. But if you have a MR car thats loose or balanced on stock rims it will be real loose on +1s and that where the issue is...

 

[Johnnypenso]

I have just checked this out on a Ford GT '06, I purchased 2 of these beauties and equipped one with custom rims (+1 inch) and left the other one with standard rims. What was very strange in this is that when I took both cars to phototravel to compare tire width, the rear stock rims where wider than the custom +1's!! The custom rear rims were the same skinny width as in the front!


EDIT!
So I grabbed both cars to test the difference on High Speed Ring with Sports Hard Tires. For fairness, I decided to have 3 laps in both cars & picking the fastest lap of the 3 (BTW I'm using a DS3). So in terms of handling, the standard stock rimed GT understeered quite alot, no back end kicking out at all. The +1 however actually felt more balanced to me, it had less understeer and also the back did kick out but only very slightly during low speeds conners (on the S bends) but it was very very easy to control and had no problem with it, in fact it went around the bends faster by 5-7mph.

Here are the lap times for both
Ford GT Standard Rims: 1:10.073
Ford GT Custom +1 Inch Rims: 1:09.100

The Ford GT has PD built in a frustrating level of understeer that's hard to correct with tuning. Slightly less grip in the rear probably helps the car rotate a bit better, hence it's better laptimes.

 

[xSNAKEx]

Yes the tires stay the same size. What is happening is that when you put bigger rims on your car you are getting lower profile tires. I'd be interested in research of how that effects handling. It should make the ride stiffer, which is faster but it won't ride bumps as well. Silverstone would be a good track to test this at. I would do it myself but the game's freezing broke my PS3 and I'm waiting on the replacement laser to read game discs.

LOL the profile tyres doesn't affect width of tyres.

 

[Maurek]

So does reverting back to stock help this or no?

 

[Stotty]

So does reverting back to stock help this or no?

Yes... reverting to stock rims takes the car back to normal.

 

[Marqus]

I'm not saying it isn't an issue or that PD shouldn't fix it, but in a game this complex things get missed. At least by identifying it, people can now deal with it until it gets fixed. But you'll have to forgive me if I'm a bit jaded by the complete whine fest that's been going on since the game was released. To hear most people tell it you'd swear GT6 caused the apocalypse and did something un-gentlemanly with their sister.

IT's just the fact that GT6 Knows every trick in the book to dampen my good spirits with the game. I know that GT5 got a bad rap for numerous reasons but it was GT5 that convinced me to try Gran Turismo. So far, all the reasons I switched to GT is missing from GT6 entirely and I have to wait for updates? I've never seen a game so full of bugs and hair-brained design choices that does nothing but cause frustration. And I've played Sonic '06.

 

[ace004]

I have just checked this out on a Ford GT '06, I purchased 2 of these beauties and equipped one with custom rims (+1 inch) and left the other one with standard rims. What was very strange in this is that when I took both cars to phototravel to compare tire width, the rear stock rims where wider than the custom +1's!! The custom rear rims were the same skinny width as in the front!


EDIT!
So I grabbed both cars to test the difference on High Speed Ring with Sports Hard Tires. For fairness, I decided to have 3 laps in both cars & picking the fastest lap of the 3 (BTW I'm using a DS3). So in terms of handling, the standard stock rimed GT understeered quite alot, no back end kicking out at all. The +1 however actually felt more balanced to me, it had less understeer and also the back did kick out but only very slightly during low speeds conners (on the S bends) but it was very very easy to control and had no problem with it, in fact it went around the bends faster by 5-7mph.

Here are the lap times for both
Ford GT Standard Rims: 1:10.073
Ford GT Custom +1 Inch Rims: 1:09.100

Just like @Johnnypenso said, if the car understeers then equipping the aftermarket wheels can actually help sometimes. I had the same thing happen to one of my cars, but it also was only at 450PP. At the lower PP the car was turning faster times and I had to tune it completely different to achieve the same times with stock wheels. But once I started to increase the PP the loss of grip became very noticeable. So in short keep the stock wheels and adjust with tuning, unless you only plan to run the car at a specific PP.

 

[Sarkazmo]

I tried to verify this today using the BMW CSL I had tuned and set up to run Brands Hatch Indy course for the GTPlanet Parity event @53.008 seconds (the event had a minimum time of 53.000 for a lap and a max speed of 127mph at the braking zone for the first turn on CS tires.) One of the first things I did after testing out the car to see if it was a suitable candidate for the Parity event was paint the car and change the wheels. The car, though fast, over steered a lot and was unstable. After reading this post I got to thinking about how the car was so twitchy. I ran several laps to familiarize myself with the car again then switched back to stock wheels. The change was immediately apparent! The car became much more stable under acceleration and braking and the rampant over steer was replaced with light under steer that was easily dealt with through trail braking, tapping the brake mid turn to pull the nose in, or blipping the throttle to induce over steer. After just a few laps I turned a lap .6 faster than my best time so far. The change in the feel of the car was so drastic that I believe with more practice I could cut another .4 or .5 off this new fastest lap time.

The CSL doesn't have a massive amount of width difference from the front to the rear tires so this shows that even a small amount of width difference is enough to totally change the handling characteristic of a car.

Sark

 

[Amac500]

LOL the profile tyres doesn't affect width of tyres.

LOL, I never said they did, but since we were talking about how width effecting the handling I brought up the effects of profile as well.

 

[andryush]

Why PD didn't gave us an option to chose tire width freely? Forza have this feature since first instalment. GT6s physics engine calculates handling properly and it actualy takes tire sizes into account, this bug wouldn't be present if not. So i don't see a reason, for not adding this feature in GT6. Probably they just want to make more money and they will include this feature in future instalments of Gran Turismo...

 

[mohammad]

thanks for info & the find..
im a bit confused now..

i should avoid using custom wheels on All cars.. or just some cars?
& what if i change the wheel in standard size & not inches up? that still has bad effects?

 

[Vagabond]

thanks for info & the find..
im a bit confused now..

i should avoid using custom wheels on All cars.. or just some cars?
& what if i change the wheel in standard size & not inches up? that still has bad effects?

It will affect any car that has wider wheels/tyres on the rear - changing to custom rims makes all wheels/tyres the same width as the front were when stock rims were fitted. I haven't tested all cars and rim sizes but as far as I am aware at this point, the effect is the same with any diameter rim. The only car apparently not affected is the GT40 Mk1.

 

[mohammad]

It will affect any car that has wider wheels/tyres on the rear - changing to custom rims makes all wheels/tyres the same width as the front were when stock rims were fitted. I haven't tested all cars and rim sizes but as far as I am aware at this point, the effect is the same with any diameter rim. The only car apparently not affected is the GT40 Mk1.

thanks.. now last question.. i know i sound dumb but how will i know a car has wider wheels on the rear

 

[Vagabond]

@mohammad With most it is visually obvious but if you take it as a given that all MRs have wider rears, all high powered FRs, many regular FRs, and some 4WD (Lambos, Audis etc..) It actually doesn't leave many cars you can change to custom rims without affecting handling, although some that exhibit horrible understeer on stock rims will benefit from the loss of rear grip.

 

[andryush]

Just tested stock RUF RGT with custom suspension setup on Mount Panorama Circuit. On aftermarket wheels in original (0) size i managed to do 2:21:198. On standard wheels i got 2:19:926 after first lap! (suspension setup was created for car on custom wheels)... Aftermarket wheels in+2 size gave result of 2:21:268, car felt stiff and very harsh, finishing clean lap was very difficult.