Dual Wheels

[A Trebor]

I know its not right but can you use larger duals than the tractor wheel and what would the problem be if I did. ie 18.4 x 38 or 20.8 x 38 on to a 16.9 x 38 tyre.

 

[multi power]

sometimes needs must, you could run the bigger wheels at lower pressure

 

[grumpy]

its one thing running a similar sized tyre with more tread but an 18.4/38 has a significant bigger rolling radius than an 16.9/38 never mind an 20.8/38.that dependant they have the same side wall %,@Cowabunga will tell you more about that as he is a whizz on tyres.but i wouldnt do it you will have the halfshats off.

 

[Exfarmer]

its one thing running a similar sized tyre with more tread but an 18.4/38 has a significant bigger rolling radius than an 16.9/38 never mind an 20.8/38.that dependant they have the same side wall %,@Cowabunga will tell you more about that as he is a whizz on tyres.but i wouldnt do it you will have the halfshats off.

I would agree with this, but I would think they will break away from the inner first hopefully

 

[Cowabunga]

No you cannot. The outer wheels should never be bigger, they should be the same notional diameter but the most worn and least pressure. Failure to comply will probably result in severe damage.

 

[A Trebor]

OK thanks more or less what I thought.Any one got 16.9 x 38 for sale fairly local?

 

[Lincsman]

OK thanks more or less what I thought.Any one got 16.9 x 38 for sale fairly local?

Heap of various tyres at Farmstar, Brigg.

 

[Honeybadger]

I agree that in theory it will place more strain on that tractor, wheel clamps and rims depending on how they are fastened.

However I'm sure John Dale was running on duals with a greater pressure in the outer tyres to maintain track width with combine for CTF. Also I've seen plenty of spacers placed on the hubs of tractors for increased bed widths used in veg crops these would have the same effect as running larger tyres on the outside of duals, although there maybe load and working restrictions.

 

[DrDunc]

I agree that in theory it will place more strain on that tractor, wheel clamps and rims depending on how they are fastened.

However I'm sure John Dale was running on duals with a greater pressure in the outer tyres to maintain track width with combine for CTF. Also I've seen plenty of spacers placed on the hubs of tractors for increased bed widths used in veg crops these would have the same effect as running larger tyres on the outside of duals, although there maybe load and working restrictions.

What you've seen doesn't make it good practise though does it?

It's not rocket science; the further out they stick, the longer the lever. If you've a nut you can't undo, you get a bigger lever (alright gas axe cold chisel big hammer, but you get the analogy)

Also for the same lever length, if you apply a bigger load, you generate a greater torque. So if the outer tyre is taking a greater proportion of the weight because it's a bigger diameter, the lever arm length and the applied load is greater.

Net result is eventual metal fatigue, failure, and a damp bank managers shoulder.

 

[Honeybadger]

What you've seen doesn't make it good practise though does it?

It's not rocket science; the further out they stick, the longer the lever. If you've a nut you can't undo, you get a bigger lever (alright gas axe cold chisel big hammer, but you get the analogy)

Also for the same lever length, if you apply a bigger load, you generate a greater torque. So if the outer tyre is taking a greater proportion of the weight because it's a bigger diameter, the lever arm length and the applied load is greater.

Net result is eventual metal fatigue, failure, and a damp bank managers shoulder.

Okay,

See 1st sentence and last sentence of my post.