Going Up a Tyre Size With 50mm Lift Already Installed

Submitted: Friday, Apr 20, 2018 at 11:16
ThreadID: 136587 Views:6394 Replies:8 FollowUps:15
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Hi, further to my thread about choice of A/T tyres, I thought I'd ask another question relating to lift and tyre size:

I had initially thought of going up from 265/65 to 265/70 as I already have a 50mm lift fitted and wouldn't mind filling the arches a bit more, along with the very slight increase in clearance.

I hear varying things relating to the legality of this. From looking around online, it seems to be the case that you can't lift the overall vehicle height more than 50mm without engineering certification.

Speaking to various tyre places when getting quotes, most said that the slight increase in tyre size wouldn't affect legality as in addition to the lift, you're allowed a slight increase in tyre size. I doubt this.

There are thousands and thousands of rigs in WA running larger tyres and suspension lifts and I'm sure only a very small percentage of them have engineering certification and the ones that do would be running huge mods. Is it really that much of an issue and will I have to worry about insurance paying out in the event of an accident if I go with the bigger rubber? I've heard a fair amount about people still getting payouts despite having lifts and larger rubber...

Also, would the small increase in tyre size realistically be of any benefit other than the fact that the arches would fill a bit more and make the car look a bit more serious? I don't know if this would actually be of any real benefit off road...

With the current deal that Bob Jane are doing on Hankook Dynapros right now, I could potentially get four 265/65 for $735 and use my best existing worn tyre as a spare, as opposed to spending $1370 on five of the of the 265/70/17...

Thanks in advance
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