Honda NR750 v. 1.0

[h106frp]

I know the replays often make the issue worse where the wheels raise into corners but in this video I see again something I saw before and that is the rear tyre is above the track most of the time and the front sometimes too.  Is that a shadow problem or something else?

I have noticed this with my rear tyre and I think it might possibly be related to the 3D model dimensions (correct for a road bike tyre) not reflecting the rolling radius declared in the tyre file when using the default files. 

[doubledragoncc]

Ok thanks H, but is this going to effect handling in GPB or just graphical?

DD

[h106frp]

Only guessing at the cause, but if correct it would be purely graphical. Maybe with some info we can pin it down;

For reference, the default modern 990 GP racing tyres are declared by GPBikes as front=0.295m radius, rear=0.325m radius

@Blackheart - How does this compare to the radius you have used for your tyres in the 3D model ?

Looking at numbers for modern road tyres anything between .288 - .302 front and .308-.327 rear are typical ranges for rolling radius which could explain the floating bike problem if you have modeled (period) tyres at the smaller end of the range

Might explain something   

NR750
Front Wheel    16x3.5 in. magnesium alloy - popular with Honda at the time   
Rear Wheel    17x5.5 in. magnesium alloy

[Blackheart]

I still have not touched the wheels

[h106frp]

So these are the stock wheel models? They should work OK

[Blackheart]

So these are the stock wheel models? They should work OK

Nope the model is my, different sizes from stock but the data are of the stock so little problems are normal for now :p

[Blackheart]

I know the replays often make the issue worse where the wheels raise into corners but in this video I see again something I saw before and that is the rear tyre is above the track most of the time and the front sometimes too.  Is that a shadow problem or something else?

As I wrote above I still have to put the right datas for the wheels, I do not know if the wobbles also depend on this, if someone wants to do testing in the nr_rr750_road_f_standard.tyre and nr_rr750_road_r_standard.tyre change this default lines;

Mass = 8.75
Inertia = 0.45, 0.25, 0.25
Radius = 0.295
TorusRadius = 0.07
Width = 80
SpringBase = 65000
SpringFactor = 500
Damper = 770
RadiusRPS = 0.0001
MaxDrainage = 5

[doubledragoncc]

The front tyre nr_rr750_road_f_standard.tyre has those and is 80 width but the rear tyre is not and has a larger radius 0.325 than the 0.295 so it would be making it smaller and it is only 60 wide not 80 so it is thinner than the front if I am correct? That seems wrong?

is the Width = 60 for the rear wrong to start with but the 0.325 correct?

DD

[h106frp]

The theory holds then  Model and tyre file not matched

The width parameter is odd, the files are the same for the original default 990 set

More typical values are around 120 front, 190 rear  so nothing seems to tie in for this value. I think only MaX has any idea how this works

[Blackheart]

There is a wiki page for the tires? 

I found this http://forum.piboso.com/index.php?topic=687.0

If anyone understands these things, translate it for me in an easy way 

EDIT

[h106frp]

There is a wiki page for the tires? 

I found this http://forum.piboso.com/index.php?topic=687.0

If anyone understands these things, translate it for me in an easy way 

EDIT

MaXTire^(tm)  please MaX


Looks like you should be able to just change the radius if you want it to just look OK in game for now with the same simulated profile as the 990. The problem would be if it effects trail measurement too much as you steering geometry is probably modeled around the 16'' wheel if you built the model from an image so you need the smaller tire. Worth trying to see if it works, try 0.283 for the front and see what it looks like.

The link seems to indicate 2 ways to deduce radius though, total and height to shoulder. I guess total is correct as it aligns with normal sizes.

I will try and experiment later to derive a set of road tires, the numbers in the link are for 195/55/17 so correct for me

width is an angle in degrees that describes half of the arc of the useful tire tread. So, 120 degrees of tread (useful tire)

Mass is odd as well - i have a tire spec for a road bike says 15lbs, 6.8kg for a rear tire 

[Urban Chaos 2.0]

The wobble really isn't that bad. It's very controllable, and the bike's incredibly easy to ride. A crash is a very, very rare event with this bike.

[doubledragoncc]

BUT, Urban it is totally unrealistic and is simply wrong.

DD

[Urban Chaos 2.0]

Well, if that's the case it should be fixed. It's not something I'll miss anyway, haha.

[Blackheart]

Only the 1.0 version will have the physical and definitive graphics, previous versions are made to find problems to help you find issues.

Unfortunately the Piboso mod wiki sucks, so all the informations are to search on the forum.