9th-Apr-20, 10:02 AM
Does anyone know what wheel size (diameter) was used on 90-95 ITC/DTM seies cars ?
And if known, what tyre width and profile.
Cheers
And if known, what tyre width and profile.
Cheers
1990-96 DTM ITC question
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9th-Apr-20, 02:41 PM
Loads of info there once translated, thanks woodcote :)
Unfortunately it doesn't help as it says:
"Wheels and tyres: The full wheels are free provided they can fit in the original body with the authorized wing extensions (see art. 5.7.2.11), and do not have a diameter greater than 810 mm. The use of tyres for motorcycles is prohibited. It is forbidden to mount intermediate elements between wheels and tires. The diameter of the rims can be increased or decreased to 2'" from the original size. Not all wheels need to be the same diameter. Changing wheel attachments by bolts to studs and nuts can be done freely. In the case of a central nut wheel attachment, a safety spring must be in place on the nut throughout the test and must be replaced after any wheel change. The springs must be painted "Dayglo" red. Replacement springs must be available at all times."
810 mm would allow a 20" rim with a 295/50 tyre, something that would have looked very out of place on the cars of the era !
Taking a stock 1996 road Alfa 155 as a baseline, the sportier versions came with a max 16" wheel size.
In theory the race cars could have had up to an 18" wheel. fitted with a maybe a 295/60 tyre, but the pictures indicate they were a lot lower profile than that.
I am guessing most ran an 18" rim and between a 30 and 40 profile tyre.
Assuming a 295 as not sure what was commonly available on race cars for that period.
I am trying to determine what would be scale correct for 1/32. Given the visible part of a slot car rim, 16.5mm would be an 18" and a 295/35 tyre would give an overall diameter of 664mm which would be 20.74mm in 1/32 if my maths is correct !
Unfortunately it doesn't help as it says:
"Wheels and tyres: The full wheels are free provided they can fit in the original body with the authorized wing extensions (see art. 5.7.2.11), and do not have a diameter greater than 810 mm. The use of tyres for motorcycles is prohibited. It is forbidden to mount intermediate elements between wheels and tires. The diameter of the rims can be increased or decreased to 2'" from the original size. Not all wheels need to be the same diameter. Changing wheel attachments by bolts to studs and nuts can be done freely. In the case of a central nut wheel attachment, a safety spring must be in place on the nut throughout the test and must be replaced after any wheel change. The springs must be painted "Dayglo" red. Replacement springs must be available at all times."
810 mm would allow a 20" rim with a 295/50 tyre, something that would have looked very out of place on the cars of the era !
Taking a stock 1996 road Alfa 155 as a baseline, the sportier versions came with a max 16" wheel size.
In theory the race cars could have had up to an 18" wheel. fitted with a maybe a 295/60 tyre, but the pictures indicate they were a lot lower profile than that.
I am guessing most ran an 18" rim and between a 30 and 40 profile tyre.
Assuming a 295 as not sure what was commonly available on race cars for that period.
I am trying to determine what would be scale correct for 1/32. Given the visible part of a slot car rim, 16.5mm would be an 18" and a 295/35 tyre would give an overall diameter of 664mm which would be 20.74mm in 1/32 if my maths is correct !
9th-Apr-20, 08:32 PM
Tamar also linked me some other sites on another forum, seems for example the Merc 190 ran 18" rims 9" wide.
That would put the tire widths at 245-255 area. looking at pics I cant see the profile being more than 40 at a guess, so that would give a 650-660 tyre diameter.
so a 16.5mm wheel with 20.6 mm tyre diameter should pretty much be right in 1/32.
That would put the tire widths at 245-255 area. looking at pics I cant see the profile being more than 40 at a guess, so that would give a 650-660 tyre diameter.
so a 16.5mm wheel with 20.6 mm tyre diameter should pretty much be right in 1/32.
10th-Apr-20, 12:02 AM
Given that we both spread our posts over two fora 
...
...I noticed that the Slot.it inserts for the DTM cars have the same diameter as the "visible" rim of the wheels.
As in they're not fitted completely inside the hub like on older GrC and GT LMP cars. On the DTM cars the inserts outer flange fits over the hub (like Sideways)
with kind regards
Tamar
......I noticed that the Slot.it inserts for the DTM cars have the same diameter as the "visible" rim of the wheels.
As in they're not fitted completely inside the hub like on older GrC and GT LMP cars. On the DTM cars the inserts outer flange fits over the hub (like Sideways)
with kind regards
Tamar
10th-Apr-20, 06:02 AM
Yes the DTM/ITC inserts sit on the lips of the 15.8 rim,which allows for use on 15.8 and 16.5 rims 
A cool idea, and (IMO) better implemented on the slot.it as they are very thin at the edge so as to not have a lip.
Of course that's assuming I can get them out of the stock wheels in one piece, sometimes they don't come out without a fight, but I do have some spare for worst case scenario !
A cool idea, and (IMO) better implemented on the slot.it as they are very thin at the edge so as to not have a lip.
Of course that's assuming I can get them out of the stock wheels in one piece, sometimes they don't come out without a fight, but I do have some spare for worst case scenario !
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