Tyre Control

As you may be aware, if you have read the ACTC council September minutes, we are looking to an alternative form of tyre control. The existing approved list is becoming unsuitable for purpose. Budget tyres come and go quicker than the list can be updated and tread patterns change whilst keeping the same name. The basis of the list is the subjective approval of a tread pattern, whilst other organisers of trials (M/C, VSCC ,750MC etc.) define a maximum tread block gap. This is the new approach which will be discussed by the Clubs at the April ACTC council meeting.

We are in the process of establishing a max gap to propose to the clubs at the April council meeting. I have attached the data that we have so far. If anyone would like to measure their tyres and send me the figures I will add it to the list. We are looking for the maximum block gap anywhere on the tread. If the new method is approved by the clubs a tyre can be checked by ensuring a gauge of the agreed size can be held in the biggest gap, as shown in the image above. It can be seen from the data that tyre size can have an impact on block gaps. This is something the present list fails to address. Looking to the future the opportunity to have different limits per class or specific car would be possible.

Pete Hart [email protected]

DiaSectionProfileNameMax Tread Gap
1315580Colway5.6
1317570Mentor M4007.1
1416580Vredestein Sprint5
1416580Dunlop SP 75
1416580Roadstone SB8025.6
1417580Vredestein Sprint5.7
1418580Matador MP3006.5
1417565Mentor M4006.8
1417580Kingpin KMT7.1
1416580Kingpin KMT7.2
1418580Hankook K7157.4
1418580Kingpin K4S7.5
1516580Toyo 3304.4
1516580Maxxis MA5014.8
1516580Vredestein Sprint5.5
1516580Pirelli Cinturato5.5
1516580Firestone F5605.5
1516580T Trac7.1
1518580Matador MP3007.5
1518580Hankook RA107.5
1518580Kingpin K4S9.5
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