Comparing the "barrel back" BRA with the "beetle back" JZR
Measurements are in mm

                                                                                               JZR                                              BRA

The BRA car is deeper, one sits in it more and far more comfortably. The cockpit is wider. By reason of seat back width being wider there is more width across "your butt!" For example, I offer sliding bucket seats as an optional extra, these give slightly more increased leg length, however, these will not fit in my JZR. Opinions widely held are that one tends to sit in a BRA more than in a JZR, in fact one’s body tends to protrude more above the JZR cockpit coaming.


                       In the photos below, the red car is a JZR beetle back, and the black and silver car is a BRA barrel back

        
Compare the respective shoulder levels.

              
Click on the above photos to enlarge

You can see from the above pictures, how the seating position differs, and how one's body presents more drag in a JZR than a BRA. To put this in a little perspective, I am 5ft 5ins/1.65m tall and weigh 175lbs/ 79kg.

 

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