I want to calculate brake torque from indicated torque for motorcycle.

  • $\begingroup$ What is preventing you from calculating brake torque? $\endgroup$ Oct 12, 2019 at 20:41
  • $\begingroup$ I've never heard the term "brake torque." Brake horsepower comes from the use of a brake to measure torque. $\endgroup$
    – Tiger Guy
    Mar 9, 2020 at 15:11
  • $\begingroup$ Usually "torque at the engine output shaft" - especially since, unlike power, the torque varies widely depening on gearing in the gearbox, chain / drive shaft and rear wheel size. $\endgroup$
    – towe
    Jun 27, 2022 at 4:49

1 Answer 1


Brake torque usually means torque at the engine crankshaft, while there is no loss of power or toque due to transmission, powertrain or in your case the chain and gearbox.

You would have to subtract those losses if the indicated torque is the wheel torque.

  • $\begingroup$ Add to compensate for the extra losses... $\endgroup$
    – Solar Mike
    Oct 11, 2019 at 4:26

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