3 easy steps to achieving optimum tyre pressure

Get the tyre pressure right – and keep the ground breathing!

includes

a guide

to determine

your optimal

tyre pressure

3 steps to achieving optimum tyre pressuretry it, and make sure you’re working with the right tyre pressurehere is how you go about determining your optimal tyre pressures:1. establish your tractor’s wheel load• by weighing each axle when fitted with different attachments and weights or• by estimating it (inside this brochure you will find a guide to estimating the wheel load)

2. take the appropriate tyre pressure values for the required speed from the technical Data Book.

3. enter the respective values on the sticker enclosed. ensure that this sticker is placed in a clearly visibly position on your tractor and then you can always double-check your tyre pressure values.

under the sticker there is an application example

If you have any questions about tyrepressure settings, we’re here to help you

mitas a.s.

Švehlova 1900, 106 25 Praha 10, Czech RepublicTechnical support hotline: 267 111 594, 577 523 437 (482) business@mitas-tyres.com, www.mitas-tyres.com

The estimation rules given in this brochure are for information only. To the extent permitted by law, no warranty, express or implied, and no liability in connection with the use of the information is contained in this publication. There is no liability for any direct, indirect, incidental, consequential or punitive damages arising out of the use of this publication.

Enter the details of your tractor tyres, the equipment attached and the optimum tyre pressure for the front axle (FA) and rear axle (RA) when driving on the road and in the field – as shown here.

Front axle:Mitas

rear axle: Mitas

Attached equipment/application Road . . . . . . . km/h Field 10 km/h FA (bar) RA (bar) FA (bar) RA (bar)

5 4 0 6 5 2 8 R D 0 3 R D 0 3 6 5 0 6 5 3 8

Seed drilling set-up 1.6 1.6 0.6 0.6

www-mitas-tyres.com

R

R

/

/

50

tractor tyres

campaign For the right tyre pressure

campaign For the right tyre pressure

The following two examples illustrate the factors mentioned that affect the wheel load and help in the estimation:

Formula for calculation of front and rear axle weights:Front axle weight with ballast = FAL empty − R ⁄ W × RW + (F ⁄ W + 1) × FWRear axle weight with ballast = RAL empty + (R ⁄ W + 1) × RW − F ⁄ W × FW

calculation for the front tyre load:Front axle load with weight = 2 600 kg − 2.0 ⁄ 2.8 m × 2 600 kg + (1.0 m ⁄ 2.8 m + 1) × 800 kg = 2 600 kg − 1 857 kg + 1 086 kg = 1 829 kg (= front axle load) ⁄ 2 = wheel load Front wheel load = 915 kg

please read the corresponding inflation pressure for the calculated wheel load (915 kg) and depending on the speed from the technical data book.

calculation for the rear tyre load:Rear axle load with weigh = 3 900 kg + (2.0 m ⁄ 2.8 m + 1) × 2 600 kg − 1.0 m ⁄ 2.8 m × 800 kg = 3 900 kg + 4 457 kg − 286 kg = 8 071 kg (= rear axle load) ⁄ 2 = wheel loadRear wheel load = 4 035 kg

please read the corresponding inflation pressure for the calculated wheel load (4 035 kg) and depending on the speed from the technical data book.

Tractor 150 HP-class, with additional weights – road application Max. weight allowed: 10 000 kg Tyre sizes: front axle (FA) Mitas 540/65 R 28 RD-03; rear axle (RA) Mitas 650/65 R 38 RD-03

example a

tractor with add. weights = 9 900 kg

FA load (18 %) = 1 830 kg

per front wheel = 915 kg

RA load (82 %) = 8 070 kg

per rear wheel = 4 035 kg

tractor with weight (empty) = 6 500 kg

FA load (40 %) = 2 600 kg

RA load (60 %) = 3 900 kg

1.0 m (F) 2.8 m (W) 2.0 m (R)

add. front weight (FW) 800 kg

add. rear weight (rW) 2 600 kg

The best possible tyre pressure in the field and on the roadWith the right tyre pressure in the field and on the road, you can optimise the traction on your tractor, reduce your diesel costs and protect the ground structure!

Tyre pressure

large ground contact patch• Reduces slip and in turn diesel

consumption by up to 20 %

reduced ground pressure• Protects the ground structure, thereby

increasing return per hectare

shallow rut depth• Saves up to 10 % on fuel per centimetre

of rut depth• Avoids elaborate soil loosening work

Driving in the FielD With reDuceD tyre pressure

Driving on the roaD With increaseD tyre pressure

Tyre pressure

improved steering, tipping and braking stability• Increases driving safety

reduced rolling resistance• Cuts diesel consumption

even wear• Increases mileage performance

if you have no weighing facilities nearby, you can also just estimate the wheel load. to do this, you have to allow for the following factors:• Attached weight, tongue weight• Variable weights (full or empty tank / hopper)• Leverage / Overhang• Dynamic loads in driving operation (rocking on the road)

Distance FW to front axle (F) = 1.0 m; Wheel base (W) = 2.8 m; Distance RW to rear axle (R) = 2.0 m

Tractor 150 HP-class, with additional weights – field application Max. weight allowed: 10 000 kg Tyre sizes: front axle (FA) Mitas 540/65 R 28 RD-03; rear axle (RA) Mitas 650/65 R 38 RD-03

example B

tractor with add. weights = 8 200 kg

FA load (37 %) = 3 043 kg

per front wheel = 1 522 kg

RA load (63 %) = 5 157 kg

per rear wheel = 2 579 kg

tractor with weight (empty) = 6 500 kg

FA load (40 %) = 2 600 kg

RA load (82 %) = 3 900 kg

1.0 m (F) 2.8 m (W) 2.0 m (R)

add. front weight (FW) 800 kg

rW = 2 600kg, thereof ca. 1/3

as remaining axle weight (= 900 kg)

For field application (without high and sustained torque) the 10 km/h values apply, which in this case would lead to the lowest possible:

This example of field use shows optimum ballast distribution on front and rear axle. However, if the centre of gravity of the rear weight is shifted towards the back, this takes the load off the front axle and traction here is lost.

tyre pressure 0.6 bar

tyre size

service descripti-on li/ss

rim (permi-

tted)

section width (mm)

outer diameter

(mm)

tyre pressure speed (km/h)

0.6 0.8 1.0 1.2 1.4 1.6 2.0

650/65 r 38

157 D (160 A8)

W 18 lDW 20 A

626646 1 829

3 155 3 450 3 790 4 125 652 985 3 315 3 625 3 980 4 330 50

2 740 3 110 3 455 3 780 4 150 4 500 402 880 3 270 3 630 3 970 4 360 4 745 303 505 3 980 4 420 4 830 5 310 5 775 6 775 10Wheel load 2 579 kg

speed

tyre pressure 1.6 bar

tyre size

service descripti-on li/ss

rim (permi-

tted)

section width (mm)

outer diameter

(mm)

tyre pressure speed (km/h)

0.6 0.8 1.0 1.2 1.4 1.6 2.0

650/65 r 38

157 D (160 A8)

W 18 lDW 20 A

626646 1 829

3 155 3 450 3 790 4 125 652 985 3 315 3 625 3 980 4 330 50

2 740 3 110 3 455 3 780 4 150 4 500 402 880 3 270 3 630 3 970 4 360 4 745 303 505 3 980 4 420 4 830 5 310 5 775 6 775 10Wheel load 4 035 kg

speed

For field use with continued high torque, e. g. ploughing, the values for 30 km/h (18 mph) apply.