Outer Limits 4x4 Board

Hi guys,

I wanted to know the cheapest way to get 31' x 10.5's on an 89 sierra, maybe a small suspension lit and some 2nd hand tires? i just want my car to be able to drive on soft sand well..

cheers

i just did a 2" body lift and thats it. ive got 31x10.5R15 on 15x8" rims - no scrubbing besides on the rear of the front leaves at FULL FULL lock and it only just scrubs....just

mines a 87 chassis with 91wt body - 1.3 NT sierra


oh and total cost: $200

and that was for a 2" body lift kit from a mate who got it from Just-Cruizsen on this forum

pedzies wrote:Hi guys,

I wanted to know the cheapest way to get 31' x 10.5's on an 89 sierra, maybe a small suspension lit and some 2nd hand tires? i just want my car to be able to drive on soft sand well..

cheers

hay mate if you put 31s on your sierra for sand driving it will make it worse unless u fix the gearing issue it will have no power and struggle like sh!t.

cheers scott

I've got 2 or 3" suspension lift and hammered seams, no body lift.

2" BL- 31's no worries.

Suspension lift will not clear a bigger tyre unless your bumpstops are moved down.

A 2" suspension lift that clears 31's without rubbing will mean the springs are too stiff or the shocks are too long and acting as bumpstops.

Steve.

pedzies wrote:i just want my car to be able to drive on soft sand well..

cheers

so let your tyres down, you don't need lift or big tyres you need low tyre pressures. Larger tyres will mean your gearing is out and it wont have anywhere as much power as with smaller tyres with low pressures

In fact, for cars with limited horsepower (like everyone, really) wide tyres aren't helpful at all.

Watch a wide tyre on the sand - there's a little bow wave of sand being pushed in front of the tyre when the cars moving. The wider than bow wave is, the more power it takes to push it.

What you really need is a tall, narrow tyre. The same cm2 of footprint in a narrower tyre will take less power but the same floatation.

Ever wondered why Paris/Dakar cars run 7" wide tyres... with 400L of fuel and massive, massive dunes? It's becuase they are generally horsepower limited, if not by rules (although they often are) then by fuel range. Smaller tyres take much less power to push.

That's the ting. When you air down, the tyre gets longer, not wider, and that's why it's a a massive advantage.

Gearing, of course, is vital.

Steve.

i just learnt something then Steve

thanks

islandvit

Angle grinder ...

Including cost of purchase of the grinder you will only be out about $50

love_mud wrote:Angle grinder ...

Including cost of purchase of the grinder you will only be out about $50

I was going to say this, plus borrowing your mates welder for bump stop extensions.

That said big tyres aren't the be all and end all of offroading.