The International Dutch Championship originated from OW Cupraces which were organised since 2013 before 2013 KNMV Cupraces were organised.
In 2021 the OW Cupraces merged into the International Dutch Championship, the IDC championship. Due to the class structure IDC races offer participants the opportunity to develop and grow in motorbike racing. Amateur- and elite sporters support each other in their development..
In the International Dutch Championship riders are divided into two 600cc classes and two 1000cc classes. These classes are separated by class limit times. Because riders can ride in different classes each rider experiences competition and fun at her/his own level.
Lap times on the TT Circuit Assen in the different classes range from 1.39.0 min to 2.12.0 min.


Timekeeping, technical control, medical aspects, race control, digiflags, track marshals it is all present at IDC races. Years of experience in organising races at home and abroad have ensured that we as an organisation know what it takes to organise an exciting and atmospheric competition.

International Dutch Championship

The classes that can be started in 2024 are:
- Dutch Superbike
- Dutch Supersport / Dutch Supersport Next Generation bikes (NG bikes)
- Dutch ProClass 1000
- Dutch ProClass 600 / Dutch ProClass 600 Next Generation bikes (NG bikes)


Participants, who do not yet hold an IDC licence but wish to start in the International Dutch Championship and have not previously held a motorbike racing licence, should attend
a one-day CRT motorbike racing licence course.
The CRT motorbike racing licence course will be held on Friday 5 April 2024 at the TT Circuit Assen.
If you have not yet done a course you can already apply for an IDC licence 2024 and choose a start number. Of course, the licence will not be issued until the course has been
successfully completed.


The participant is responsible that her / his motorcycle is in perfect technical condition.
IDC races at the TT Circuit Assen are organised on type 2 and 3 days where the static noise limit of 102.9 dBA applies. On type 3 days a maximum dynamic noise limit of 101 dBA applies. Exceeding the applicable static noise limit will lead to disqualification.
In order to achieve a reduction in noise production, in addition to maximum structural damping of the intake and exhaust noise, the inside of the fearing, seat and underside of the tank should be provided with noise-absorbing, self-adhesive and flexible insulation material where possible.
Use of this material shows that resonance and sound transmission are strongly limited.

Track Support paddockservices

Track Support's paddock service is present on the paddock at every CRT / IDC event with tyres, parts and clothing.
Track Support provides exclusive sales and delivery of tyres, parts and clothing on the paddock. Race tyres purchased from Track Support will be provided with the IDC tyre sticker, this does not apply to street tyres.
Track Support is the exclusive dealer of clothing brand 4SR in the Netherlands. Besides custom-made leather motorbike clothing, Track Support also stocks 4SR underwear, hoodies, T-shirts and caps.
If a participant wishes to order tyres/parts prior to the event please contact Track Support or drop by the Track Support Shop which is located just 10 minutes from the TT Circuit Assen .

Opening hours Track Support Shop
- opening hours February to October: Tuesday to Saturday 09.00 - 17.30 hrs.
- opening hours November to January: Tuesday to Saturday 09.00 - 16.00.

Track Support info 07-11-2023

Track Support
Ketellapperstraat 19
9403 VS Assen 0031 626 260 615

Technical Support

Track Support sells universal parts and can perform minor technical repairs on the paddock.
Besides Track Support, several service providers at each CRT / IDC event provide brand related service and brand related sales of parts on the paddock.

These service providers are:
Edwin Ott Motoren – Yamaha
E-mail: - Tel. 0031 251 315 030
Druijff Racing – Kawasaki
E-mail: - Tel. 0031 612 690 218