Thread: 110 track width increase which rims

Your current rims are positive 33mm offset, the common approach would be to go to negative 25mm offset 16X8 steel rims. Gives you a 116mm track increase.

And is a legal rim size for 285s.

Not sure if you care, but are you aware that the max legal track width increase in NSW is 25mm?

IMO 255/85's with zero offset give good turning circle and stay within the standard flares.

Steve

Originally Posted by n plus one

Not sure if you care, but are you aware that the max legal track width increase in NSW is 25mm?

yes I do care :-) 25mm increase per wheel not engineered, as mentioned


I have 50mm per wheel engineered and legal in NSW

Originally Posted by Steve223

yes I do care :-) 25mm increase per wheel not engineered, as mentioned


I have 50mm per wheel engineered and legal in NSW

Pretty sure it's 25mm total in NSW? It's not the same as QLD etc - unless it's been recently harmonised - I know it doesn't seem to be common knowledge.

fyi
http://www.rms.nsw.gov.au/registrati...vsi09_rev4.pdf

If i'm reading the doc correct you can increase rim width for a defender by no more than 51mm subject to a max increase in wheel track of 25mm (12.5mm each side). If that is case all the increase needs to go into a decrease in the offset (increase the positive offset measurement).

If i understand the guidelines even going from a wolf rim or sawtooth rim (+20.8mm offset) to an aftermarket zero offset is beyond the permitted approval authority for an engineer because it increases the track by 42mm.

max width for a 4wd is 8" rim.

The subjectivity to the above is determining the manufacturers max rim width and offset for the subject vehicle. If you can find an anomaly somewhere in the defender range you might be able to convince an engineer that 16x8" neg 25 is within the permitted guidelines.

MLD

Originally Posted by MLD

fyi
http://www.rms.nsw.gov.au/registrati...vsi09_rev4.pdf

If i'm reading the doc correct you can increase rim width for a defender by no more than 51mm subject to a max increase in wheel track of 25mm (12.5mm each side). If that is case all the increase needs to go into a decrease in the offset (increase the positive offset measurement).

If i understand the guidelines even going from a wolf rim or sawtooth rim (+20.8mm offset) to an aftermarket zero offset is beyond the permitted approval authority for an engineer because it increases the track by 42mm.

max width for a 4wd is 8" rim.

The subjectivity to the above is determining the manufacturers max rim width and offset for the subject vehicle. If you can find an anomaly somewhere in the defender range you might be able to convince an engineer that 16x8" neg 25 is within the permitted guidelines.

MLD

yep read that but as mentioned any engineer (as long as he can justify his decision) and is willing to stick his head out can override it.

The first engineer in Sydney also told me he can not deviate from VSI09 or NCOP11 and I could not engineer the track width increase however Treeve Andrews from Kernow Engineering Pty Ltd after, doing break test, lane change test and ensuring all modifications where done correctly and effect parts upgraded engineered the track width increase as it makes the car more stable and safer.



http://www.4sdata.net/voi/public_htm...2-59-10_pm.png

Originally Posted by Steve223

yep read that but as mentioned any engineer (as long as he can justify his decision) and is willing to stick his head out can override it.

Out of interest what was ballpark cost on getting the engineering certification done?

I paid $750 + GST for my engineering cert for my suspension.

MLD