KartSport Completes its Classes Revamp

with the Announcement of Updated Cadet and

Vortex Mini ROK Chassis Specifications 

Over the last five years KartSport New Zealand has been progressively updating its engine and chassis offers to cope with17RaceofStarsCadet12EmersonVincent10leadsLiamSceats29lr-1 (002).jpg obsolescence (Raket 85), local trends (Yamaha KT100 popularity decline), international trends (all of our engines and most of our chassis are made overseas) and to address unfulfilled market segments (Briggs LO206 for grassroots karters).


In 2013, when decisions were being made regarding a replacement engine for the Cadet and Junior Restricted Age Groups, there was discussion as to whether we should make simultaneous decisions to update our Cadet and JR chassis rules to bring them more into line with other countries including Australia. The consensus at that time was to stick with what we had to ease the financial burden of the change to a new engine and to retain existing chassis stock, especially for the JR Age Group. With the benefit of hindsight, it maybe that this was the wrong decision as many participants went straight out and bought new JR chassis anyway!


At the time and subsequently, in order to provide some certainty, Rule K1.1 Wheelbase noted that the (JR) chassis17SofManCalifJacobDouglasMSwift9NZlr-2 (002).jpg dimensions were locked in until 31-12-19.


Now that the Vortex Kiwi Mini ROK engine is well established for both age groups the Executive has decided that we should complete the Engine & Chassis Revamp Project by updating our Cadet ROK and Vortex Mini ROK class rules effective 1-1-20. Note this date coincides with the commencement of the next Dry tyre contract which is an important consideration. Coincidentally this timing also corresponds with the CIK-FIA announcement last year to create homologated chassis/crash tested bodywork regulations for this chassis type (“Mini Group 3” in the 2018 CIK-FIA Technical Regulations) which is designed to help ASN’s and manufacturers around the world to standardise chassis for this age group and the 60cc air cooled engines commonly used.


Key Features of the Changes:

Cadet ROK17SKUSASNatsMicroSwiftJayUrwin2lr-1 (002).jpg

  • Option of using an international spec 950mm wheelbase 28mm tube chassis, including 30mm hollow axle, hydraulic brakes, camber and castor adjustment.

  • NOTE: Cadet Raket will stay with the existing Cadet chassis Rule K3.

Vortex Mini ROK

  • For all Group A, B, C and E event competition change the chassis to the international spec 950mm wheelbase 28mm tube chassis, including 30mm hollow axle, hydraulic brakes, camber and castor adjustment and smaller rear tyres. Note: This is the chassis the  Vortex Mini ROK engine was designed to run on.

  • Existing 1010mm chassis will remain eligible for Group F event competition only.

Key Benefits of the Changes:
  • Same chassis can be used for both age groups which means the only changes required to move up from Cadet ROK to Vortex Mini ROK will be the swapping the engine exhaust header and rpm limiter and adjustment to a heavier MAW. 

  • Improved market for sale of second hand 950mm chassis, (eligible for both classes). More competition amongst chassis suppliers in the Cadet market.

  • A competitor will be able to move from Cadet to Senior with only one chassis change and either one (Vortex Mini ROK to Vortex ROK DVS) or two (Vortex Mini ROK to Rotax Junior to Rotax Senior) engine changes.

  • Same chassis as run in Australia and many other countries around the world.

  • Cadet Raket entry level costs will potentially reduce further due to greater availability of current 900mm chassis.

Commenting on the announcement National President Graeme Moore said, “These changes, announced today, complete

17AutumnCupLonatoLoganManson463lr-2 (002).JPG the project of revamping our class offers, a project which we began five years ago. While any change brings challenges, especially for those directly concerned and with current investment, the Executive has the responsibility to make decisions in the best interests of the sport overall and especially with a view to the future. Barring any unforeseen circumstances, we expect these changes to be the last major changes for some time. In fact, it has been widely discussed that the next challenge we will face will be regarding electric propulsion for karts, but that is for the future!”

“The decision to open up of the cadet chassis rules will potentially have an effect on Kiwi Kart which has dominated this segment for many years under the leadership of the current chassis designer Graeme Voss. However, we have no doubt Graeme will rise to the challenge to ensure Kiwi Kart has competitive chassis available to the new specifications.”



Having completed these transitions, we will be closely in line with the rest of the world. We will offer two pathways for competitors:


Budget/Grassroots Pathway:

               Cadet Raket on old 900mm chassis.

               Junior Briggs/Junior Raket 120 on either 1010mm or full-size chassis.

               Senior Briggs/Raket 120 on full size chassis.

IE: only two engines and max of three chassis for life.


Championship Pathway:

               Cadet ROK on 950mm chassis with restricted engine.

               Vortex Mini ROK on 950mm chassis with engine derestricted.

               Vortex ROK DVS Junior or Rotax Max Junior on full size chassis.

               Vortex ROK DVS or Senior Rotax Max on full size chassis.

IE: only two engines and two chassis for life if Vortex Mini ROK and DVS chosen.

     Rotax Max option only requires barrel change from Junior to Senior.


Note: Detailed class/chassis rules/specifications will be announced over the next 12 months. Currently no decisions have been made regarding tyre specifications, wheel widths and respective class MAW’s.


Captions: Emerson Vincent #10 and Liam Sceats #29 competing in Australia in Cadet 12 class (VMR) Credit Fast Company/Coopers Photography. Jacob Douglas #9 competing in USA in Mini Swift class (VMR), Credit Fast Company/Tony Leone . Jay Urwin #42 competing in USA in Micro Swift class (CR), Credit Fast Company/Coopers Photography. Logan Manson #463 competing in Mini ROK class (VMR) in Italy, Credit FastCompany/Umberto Fraenkel-sportinphoto.com.


Questions & Answers


Q: Will my current 900mm Cadet chassis be obsolete?

A: No. It will remain the spec chassis for Cadet Raket and will be an option (alongside the new 950mm chassis) for Cadet ROK.


Q: Will my current 1010mm Vortex Mini ROK chassis be obsolete?

A: No. It will still be able to be used for  the Vortex Mini ROK class on Club Days or it could still be used for any Junior or Senior class (eg Junior ClubSport 120, Junior Clubsport LO206, Junior 100cc Yamaha, 125cc Rotax Max Junior, etc).


Q: Why are the wheel widths undecided?

A: This is largely dependent on the next tyre contract considerations. Does the sport and the local karting trade want to have to stock special tyres just for Cadet and VMR or not? In Europe and Australia the 950mm chassis run on a narrow front tyre. In USA they run on a normal front tyre all round. (Compare in pictures above.) A decision regarding this will be made during 2019.


Q: If I have a VMR 1010mm chassis on 1 January 2020 and I don’t want to go to a 950mm chassis what are my options?
A: The age rules for the Junior class change on 1-1-19 so you will be eligible to race in Junior classes provided you are 11 years old on the 31st of December 2019 OR you can race in Junior ClubSport classes provided you are aged 10+ years on 1-1-20 OR you can restrict your racing to VMR on Club Days only with your existing 1010mm chasssis.

KartSport New Zealand