Outer Limits 4x4 Board

just a few questions about engineering like how hard is it get things engineered and how much does it cost, im doing a 2in susp lift, 2in body lift with 33x12.5 tyres

Not hard if your got the money eg 500 smacks

Altho you may be ok with that lift But don`t quote me on that

As im not sure on pj`s

I got 35's engineered by a guy in Eltham called Bill Malkoutzis. He cahrged an hourly rate as opposed to the guy who did my V8, looked at it for 20 min and said "That'll be $600"

Ended up costing round the $400 mark. Expect cornering / handling tests (I had a lift but stiffer suspension so it was OK) Mud guards to 30cm of the road and flares to cover and a brake fade test.

He is fair andf reasonable but won't cut corners. I have posted his details before but can't remember where.

V8 Middy wrote:I got 35's engineered by a guy in Eltham called Bill Malkoutzis. He cahrged an hourly rate as opposed to the guy who did my V8, looked at it for 20 min and said "That'll be $600"

Ended up costing round the $400 mark. Expect cornering / handling tests (I had a lift but stiffer suspension so it was OK) Mud guards to 30cm of the road and flares to cover and a brake fade test.

He is fair andf reasonable but won't cut corners. I have posted his details before but can't remember where.

whats that part about the mud guards

The mud guards have to be within 30cm of the ground. I bought some 3mm by 30cm wide rubber from clarkes and riveted it to the bottom of my mud guard, then put on chains to make sure it doesn't foul on the tyre. You could also just take them off once its engineered but I figured leave em.

so you mean mud flaps

33x12.5x15 don't fit on a 15x8 rim so they won't engineer them

blkmav wrote:33x12.5x15 don't fit on a 15x8 rim so they won't engineer them

I have 35s on 15x8s

15x8 is ok, so long as you can get paperwork from the tyre manufacturer supporting the use of an 8" rim. Mickey Thompson is one that supports 8" rims.....

v840 wrote:

blkmav wrote:33x12.5x15 don't fit on a 15x8 rim so they won't engineer them

I have 35s on 15x8s

Wrong choice of words. According to the old tyre and rim manual 12.5 needs a 8 inch rim.

However I have just heard in the 2005 tyre and rim guide this is a legal fitment...

v840 wrote:

blkmav wrote:33x12.5x15 don't fit on a 15x8 rim so they won't engineer them

I have 35s on 15x8s

*SOME* 12.5's require more than an 8inch rim. 8inch rim is the limit except for work utes i think it was. Some tires you could get engineered no probs, others you could not..

bogged wrote:

v840 wrote:

blkmav wrote:33x12.5x15 don't fit on a 15x8 rim so they won't engineer them

I have 35s on 15x8s

*SOME* 12.5's require more than an 8inch rim. 8inch rim is the limit except for work utes i think it was. Some tires you could get engineered no probs, others you could not..

The words in my last post are words from the mouth of the Automotive Engineer doing my truck......

But yeah, that's precisely why like you said, some tyres can, others can't. Depends on the manufactures guidelines....

im looking at M/T claws and they recommend minimum 15x8 so thats what im getting.

Brilliant choice That's what i'm running, on 15x8's and the engineer gave it the thumbs up once i showed him MT's specification sheet justifying 8" width....


A point of interest to, on one of our 1st converstations he said that the widest legal rim is 8". I didn't get the specifics on why, or whether it was for my vehicle type. But it's an interesting point, as it means you can't legally run the vast majority of 12.5" tyres on the road....

When I had the 35's engineered, it didn't matter what the tyre spec's said. The Rules are apparently set by the Australian Tyre and rim fitment guide and a 35x12.5 must be on at least a 8.5in wide rim. My rims are called 15x8 but were measured at 8.5 so that was OK

V8 Middy wrote:When I had the 35's engineered, it didn't matter what the tyre spec's said. The Rules are apparently set by the Australian Tyre and rim fitment guide and a 35x12.5 must be on at least a 8.5in wide rim. My rims are called 15x8 but were measured at 8.5 so that was OK

If they messured the rims from the "outside" and not where the bead sits, will I guess that is the extra 1/2"

Well that conflicts what my engineer said. Unless it's different in Vic.

'My' engineer is the on at Cardiff that I think alot from here use.

I run 15x10 rims and my engineer passed them and included them on my certificate. The testing was done this year. If you are looking at the M/T claws i would suggest borowing a less aggressive tyre for the engineering. Get a 35' or whatever size you want engineered and run them for the testing. The engineer wont specify the brand of tyre on your rig just the sizes. I made the mistake of doing the swerve test on Mudzilla's which are similar pattern to the claws and it was scary stuff. Doing a swerve test at 100 clicks with tyres that have barely any road contact and no sideways tread could be the difference between a pass and a fail.

I know it's a whole new debate, and your arguement has merit. But, Mudzilla's won't handle 1/10th as good as what Radial Claws do. In fact, apart from the noise, you'd barely know your running muds.... Dry weather of course.
Oh, and that's probably go tto do with why Bias tyres are extremely not recommended for road use....