The distance between the motor and the axle are fixed. Carrera states that the total amount of teeth in any tuning motor / rear axle combination must equal 60. Only Z10 motors go with Z50 motors because that combination totals 60 teeth. Other combinations: Z12 motors / Z48 rear axles, Z14 motors and Z46 rear axles.
Please note that the letter Z stands for teeth. Thus, a Z10 motor means the gear on the motor has 10 teeth. A Z50 rear axle means that the gear on the axle has 50 teeth.
Carrera 85419 Digital 124 Rear Axle Z50 Bill Thomas Cheetah
Carrera 85420 Digital 124 Rear Axle Z50 Aston Martin DBR9
Carrera 85424 Digital 124 Rear Axle Z50 Audi R8 LMS
Carrera 85427 Digital 124 Front Axle Ferrari 330 P4 No.22, 1967
Carrera 85437 Digital 124 Front Axle Aston Martin DBR9
Carrera 85438 Digital 124 Front Axle Ferrari 512S Berlinetta
Carrera 85439 Digital 124 Front Axle Mercedes SLS AMG GT3
Carrera 85440 Digital 124 Front Axle Mercedes SLS AMG GT3
Carrera 85441 Digital 124 Rear Axle Z50 Aston Martin DBR9
Carrera 85443 Digital 124 Rear Axle Z50 Mercedes SLS AMG GT3
Carrera 85444 Digital 124 Rear Axle Z50 Mercedes SLS AMG GT3
Carrera 85460 Digital 124 Front Axle Ferrari 458 Italia GT3
Carrera 85461 Digital 124 Rear Axle Chevrolet Corvette C6R
Carrera 85484 Digital 124 Front Axle Chevrolet Corvette C7.R
Carrera 85487 Digital 124 Rear Axle Porsche Carrera 6 "No.42"
Carrera 85488 Digital 124 Rear Axle Ferrari 330P4, Monza 1967
Carrera 85496 Digital 124 Front Axle Ferrari 458 Italia GT3
Carrera 85508 Digital 124 Rear Axle Ford GT Race Car
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