The average rate for cars (including the levy on petrol) will surge from $287 to $352.19 a year.
Lobbying by motorcyclists, including a 5000-strong rally at Parliament last month, failed to change the ACC's plan to cut the cross-subsidies for motorcyclists, chairman John Judge said.
"We don't see any policy reason why motor vehicles as a whole should be subsidising motorcyclists."
However, a change in assumptions had trimmed the recommended increase and that could drop further if ACC Minister Nick Smith decides, as signalled, to moderate the rise.
Figures released yesterday show the ACC's final recommendation would see the levy on moped owners rise from $100 a year now to $247.22.
The cost for motorbikes bigger than 600cc would rise from $430.54 to $739.32, but that is down on the $781.12 originally suggested by the ACC. It would fall to $659.26 once the law change was in place.
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