Quarter Midgets

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MBS Set-up Tips

Listed below are some set-up tips as racers gain experience with the new MBS tire.  Some of these tips come from racers across the country that are having great success with the MBS tire.  These tips are meant to pass along information and will not work in all situations or car types.

Use less stagger on a locked rear axle.

Increase right side tire pressures 1 to 2 psi.

PSI split between RF and RR should be no more than 1 psi.

MBS tires perform best in maximum grip conditions.  Tighten the car to put more grip in the right side.

A spring change of 10 to 15 pounds on the right side. (Quarter midgets)

Keep the car from sliding.  A locked down car is faster with MBS tires.

More air = more heat = more grip. (To a point)

Increase tire pressure approximately 2 psi more than your race set-up for qualifying.

Compressed air will heat faster and increase psi more.  Nitrogen will increase less and stay more consistent.

VEGA Mounting Specs

Quarter Midget Usage

Size

Width

Mounted
Circumference

Width

Mounted
Circumference

450-6

6 1/2"

32 1/2"

6-6 ? "

32 ?"

600-6

8 1/2"

33"

7 ? - 8"

33 - 33 ?" 

650-6

 

 

8 ? ?

34 ? ?

800-6

10"

34"

8 ? - 9 ? "

34 ? - 35"

 

 

  Hoosier Racing Tire

ASPHALT QUARTER MIDGET TIRES

Item
Number

Tire Size

Tread
Width

Approx.
Dia

Approx.
Circ

Recom.
Rim

Measured
Rim

Section
Width

Compounds

15151

31.0/4.5-5

4.5"

10.0"

31"

5-6"

5"

5.5"

A35, A40A

15171

32.0/4.5-5

4.5"

10.25"

32"

5-6"

5"

5.5"

A35, A40A
15325 33.0/5.0-6

4.75"

 10.5" 33.5" 6-6.5" 6" 6.25" A35, A40A
15650 34.5/6.5-6 6.25" 11.0" 34.75" 8-8.5" 8.5" 8.25" A35, A40A

15751

35.0/7.1-6

7.00"

11.0"

35"

8-9"

9.0"

8.75"

A35, A40A

 

DIRT QUARTER MIDGET TIRES

Item
Number

Tire Size

Tread
Width

Approx.
Dia

Approx.
Circ

Recom.
Rim

Measured
Rim

Section
Width

Compounds

11050

31.0/4.5-5

4.5"

10.00"

31"

5-6"

5"

5.5"

D10, D20A

11100

32.0/4.5-5

4.5"

10.25"

32"

5-6"

5"

5.5"

D10, D20A

11175

33.0/5.0-6

4.75"

10.50"

33.5"

6-6.5"

6"

6.25"

D10, D30

11225

34.5/6.5-6

6.25"

11.00"

34.75"

8-8.5"

8.5"

8.25"

D10, D30

DIRT OVAL KARTING TIRES

Item
Number

Tire Size

Tread
Width

Approx.
Dia

Approx.
Circ

Recom.
Rim

Measured
Rim

Section
Width

Compounds

11305

10.5x4.5-6

4.5"

10.5"

32.5"

6-6.5"

6.5"

6.5"

D10, D20A

11325

10.5x5.0-6

4.75"

10.5"

33.5"

6-6.5"

6.0"

6.25"

D20A

11376

11.0x6.0-6

5.5"

10.7"

33.0"

8-8.5"

8.5"

7.875"

D10, D20A

11650

11.5x6.5-6

6.25"

11.5"

34.75"

8-8.5"

8.5"

8.25"

D20A
11850 11.0x8.1-6 8.25" 11.0" 34.0" 9-10" 10" 9.875"

D10, D20A

 

 

Compound Comparison

 

                               Dirt Oval                                                           Asphalt Oval

Hoosier
Compound

Cold
Durometer

Cross
Reference

 

Hoosier
Compound

Cold
Durometer

Cross
Reference

D10

35

Burris SS11

 

A30A

51

Vega MAS

D20A

42

Burris SS22

 

A30

54

Dunlop DCS

D30

48

Burris SS33

    

A40A

57

Firestone YFA

RD30

51

Vega MAS

 

A40

59

Firestone YGF

D40A

57

Maxxis HT3

 

 

 

 

D50

65

Burris SS-55