Tractor tyre pressure

hally

Member
Location
cumbria
Just curious what people think will be the ideal tyre pressure for this outfit. BKT 650 tyres 3ton grass drill and 1ton front
20220413_114513.jpg
weight alot of roadwork. TIA
 

DrDunc

Member
Livestock Farmer
Location
Dunsyre
Just curious what people think will be the ideal tyre pressure for this outfit. BKT 650 tyres 3ton grass drill and 1ton frontView attachment 1028950 weight alot of roadwork. TIA
Using Michelin tyre app, with the front and rear weights 2m from the f/r axles(that's a guess from the picture, but don't be far off), a 2.7m wheelbase (think Deere is slightly less), axle weights unladen 3000kg front, 4500kg rear (that's my valtra n134, think Deere more weight on rear)......

..... The results are (drum roll please)

SmartSelect_20220413-160652_MICHELIN Pressure Calculator.jpg


Looks like you'll be holding up road traffic 😱🤣

Edit

You can use the tyre loads calculated by the Michelin tyre app to look up pressure charts for BKTs. Michelin's multibibs aren't renowned as heavy load carrying tyres. The 600s originally fitted to my valtra N weren't even rated to 40kph with he tractor unladen!!!

Stick 2 bar in the rears for the road, and let them down to 1.4 bar in the field, and you'll be grand 👍
 
Last edited:

hally

Member
Location
cumbria
Using Michelin tyre app, with the front and rear weights 2m from the f/r axles(that's a guess from the picture, but don't be far off), a 2.7m wheelbase (think Deere is slightly less), axle weights unladen 3000kg front, 4500kg rear (that's my valtra n134, think Deere more weight on rear)......

..... The results are (drum roll please)

View attachment 1028999

Looks like you'll be holding up road traffic 😱🤣

Edit

You can use the tyre loads calculated by the Michelin tyre app to look up pressure charts for BKTs. Michelin's multibibs aren't renowned as heavy load carrying tyres. The 600s originally fitted to my valtra N weren't even rated to 40kph with he tractor unladen!!!

Stick 2 bar in the rears for the road, and let them down to 1.4 bar in the field, and you'll be grand 👍
We normally run at 2bar but just wanted another opinion. Thanks
 

DrDunc

Member
Livestock Farmer
Location
Dunsyre
1 bar is plenty for landwork . We normally ran at .8
Only 11.5psi? What brand?

Big tyres on a wee tractor slowly pulling nothing but it's own weight maybe, but without referring to manufacturer load/pressure charts, the heat and excessive flex won't be doing much for their longevity
 

Exfarmer

Member
Location
Bury St Edmunds
Only 11.5psi? What brand?

Big tyres on a wee tractor slowly pulling nothing but it's own weight maybe, but without referring to manufacturer load/pressure charts, the heat and excessive flex won't be doing much for their longevity
I think soil damage is far more important than tyre wall damage.
would not dream of putting such large machines on a seedbed if you cannot operate on low damage perhaps you should be doubling up on wheels
 
Last edited:
Is that really 650/65R 38? Looks so small... I use 1,2 bar with a simular drill for many years, but speed limit 30 km/h then. (trelleborg tires)
 

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Written by William Kellett from Agriland

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A man has pleaded guilty at Newtownards Magistrates’ Court to waste offences relating to a bonfire next to the electrical sub-station on the Circular Road in Newtownards, Co. Down.

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