Technical
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Information

Seat Position

 

The stagger measurement means that whenever you are measuring the front parts of the seat, that the right side measurement is .5" longer than the left. This causes the seat to be staggered to the left and compensates for engine weight. To increase front bite, move the seat forward and the rear of the seat up. To increase rear bite, move seat back and the rear of the seat down. Be sure that the bottom of the seat is level with the bottom of the frame rails, or slightly below, before drilling holes into the seat. For more or less grip, add or remove seat struts before moving the seat. (All measurements are for Birel standard seats). Use the further back options if you are running the Bridgestone tires and for Vega or Dunlop, move the seat forward and up.

 


Birel Seat Mounting Specifications

 

PRIVATEChassis Model

Seat Spacers

Seat to Tank

Axle to Seat

Seat Stagger

AR-1

1.0"-1.25"

1.0"-1.5"

8.0"-8.5"

To the left .5"

AR-4

1.25"-1.5"

1.25"-1.5"

8.0"-8.5"

To the left .5"

R-832

1.5"-1.75"

1.5"-2.0"

8.25"-8.75"

To the left .5"

R-932

1.75"-2.0"

2.5"-3.0"

8.75"-9.0"

To the left .5"

CR-932

2.0"

3.0"-3.5"

9.0"-9.25"

To the left .5"

AT130

1.25"-1.5"

1.0"-1.5"

8.0"-8.5"

To the left .5"

TO32

1.25"-1.5"

1.25"-1.5"

8.5"-8.75"

To the left .5"

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