680/85R32 MICHELIN CEREXBIB Pressure recommendation

[DangerRanger]

I’ve got a tucano with 680/85R32 Michelin CEREXBIB on and I wondering what is the lowest pressure I could sensibly run them at to maximise traction on banks and for floatation? They are currently set at 20 psi, if anyone is using the same tyres on a combine I would be interested to hear what pressures work well.

 

[brentnz]

As always, we need to know axle weights. Or at least the heads you are running so someone can’t take a guess

 

[Salopian_Will]

There is a Michelen app which will work it all out for you, which is excellent. Search Michelin pressure calculator in the App Store. Axle weights can be obtained from the combine brochure online and factor in the header and full grain tank.

alternatively all of the pressure charts will be on the Michelin website giving you the minimum pressure for a given weight/speed. It will be in here

https://dcadprod.azureedge.net/b2b-experience-production/attachments/ckcept6q0026601mhjojhh6yt-ag-tech-data-2019-full-v6.pdf

 

[DangerRanger]

As always, we need to know axle weights. Or at least the heads you are running so someone can’t take a guess

It’s a good point you make about knowing the axle weights but I don’t have a weighbridge and the combine would be too wide to fit on all weighbridges locally.
The axle weight would be different with the header on as well, I could add the plated combine weight to the plated header weight but I would need to weight of the front and back separately. I could guess weight distribution between the front and rear axles. That’s why I was asking whether anyone else was using the same tyres and what worked for them, so I’ve got a pressure to try.
The combine is a Claas tucano 440 with 7.5m vario header if that helps with and educated guess.

 

[DangerRanger]

There is a Michelen app which will work it all out for you, which is excellent. Search Michelin pressure calculator in the App Store. Axle weights can be obtained from the combine brochure online and factor in the header and full grain tank.

alternatively all of the pressure charts will be on the Michelin website giving you the minimum pressure for a given weight/speed. It will be in here

https://dcadprod.azureedge.net/b2b-experience-production/attachments/ckcept6q0026601mhjojhh6yt-ag-tech-data-2019-full-v6.pdf

Thanks for that, I’ve done some research and looked at the charts. I think I should be safe with the minimum pressure of 17psi with header on and tank full in the field. I should also be good on the road with header off and tank empty at faster speeds.