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Generally if you have entered you have entered a class. thosre tyres will be part of the class.

i.e. Im in 2B and allowed semli slicks, if I was to run slicks id be 2D. If I changed half way through Im sure my times woulkdnt count on slicks as I have entered without.

so basicallyits similar to superlap here eg i run a street tyre im in one class but can jump classes if i change tyres? is there even a class for cheap chinese tyres?

Yes and no.

Download the NSW superprint rules/regs first, don't start with general CAMs regs, there are massive compromises in the sprints rulebook to cater for the fact that road cars are permitted to run on a race track.

Start here:

http://supersprints....Provisional.pdf

Basically there are three types of tyres used in sprints

1. Road tyres

2. Semi-slicks

3. Slicks

Generally road tyres and semi-slicks can be used in types 1,2,3,SV and type 6 and slicks used in Type 4 and 5 (and SV in some cases, which essentially pushes you into type 4). It sounds like you'll be looking at Types SV or 6. You can find the definition / list of semi-slicks from for CAMS manual. Make sure to read the sprint manual to see where your car fits. The high level types are listed below (from the sprint rules/reg). Each type is split into several classes based on engine capacity. It's very easy to get involved in sprints and most people involved are pretty good. The guys who run the series will not want you switching classes willy nilly throughout the year however. You might be allowed to once or twice. The idea is to pick a class and contest it consistently.

Type 1 Unmodified Production Cars (excluding Four Wheel Drive

Turbos, Clubmans, Kit Cars and Replicas), where the only

freedoms relate to safety, engine reconditioning, tyres and

some cosmetic items.

Type 2 Modified Road-Registered Vehicles (excluding Clubmans,

Kit Cars and Replicas), allowing originally available options

and limited modifications to engines, suspension and tyres.

Type 3 Competition vehicles based on Group 3J - Improved

Production Cars rules as defined in the CAMS Manual.

Minor additional freedoms are allowed to recognise that

there will be some road-registered vehicles competing, that

cannot meet full 3J rules.

Type 4 Competition vehicles based on Group 3D - Sports Sedan

rules as defined in the CAMS Manual. In addition, any

vehicle that conforms to Type 1, 2, 3 or SV requirements,

apart from Clubmans, Kit Cars and Replicas, shall be

permitted to employ or use Race Tyres but if it does so it

shall be classified as a Type 4 vehicle.

Type 5 Clubmans, Kit Cars and Replicas (whether Road

Registered or not) using Race Tyres, Racing Cars and

Sports Racing Cars or as classified by the NSW Supersprint

Panel.

Type 6 Highly modified mass produced vehicles commonly known

as “Time Attack” vehicles that are modified specifically for

the performance of fast lap times and not for racing.

Type SV Road registered vehicles with no limit on modifications

Edited by LSX-438

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