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While the crankshaft power excludes these transmission losses, still the measurement is often made elsewhere in the drive-train, often at the rear wheel. A correction for the transmission losses is then applied to the measured values to obtain the crankshaft values. For motorcycles, the reported power and torque numbers normally pertain to the crankshaft. In directive 92/61/EEC of 30 June 1992 relating to the type-approval of two or three-wheel motor vehicles,<ref name="eur-lex.europa.eu">{{cite web|url=http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:31992L0061:EN:HTML|title=EUR-Lex - 31992L0061 - EN|website=eur-lex.europa.eu}}</ref> it is referred to as "maximum engine power", and manufacturers use similar terms. Historically, this convention may have come from the pre-[[unit construction]], wherein the crankshaft was directly accessible for measurements, and the gearbox might have come from a different manufacturer. However, when the engineering details of the transmission are known, the losses therein can be accurately quantified & corrected for. Explicit guidance on the homologation measurements and transmission corrections is given in directive 95/1/EC.<ref>http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:1995:052:0001:0040:EN:PDF {{Bare URL inline|date=August 2022}}</ref>
A main source of ambiguity and differences comes from the conditions the test was done at. These conditions include details like atmospheric conditions (temperature, pressure, humidity), tire pressure, how the motorcycle is secured against the dyno drum, but most importantly: the conditions of the motorcycle itself. Examples thereof are: was the alternator fitted?; was the air filter fitted?; what exhaust system was fitted? One would hope that manufacturers would test their motorcycles in normal running order, so the condition that they are sold in, and for which they obtained type-approval, but this is not always the case. Ducati, for instance, has chosen to publish more positive values, stating that "Technical data referring to power and torque was measured on an engine test stand at Ducati".<ref>{{cite web |url=http://ducati.com/bikes/superbike/1199_panigale_r/tech_spec.do |title=Ducati Superbike 1199 Panigale R - Ducati |access-date=2013-06-09 |url-status=dead |archive-url=https://web.archive.org/web/20130704053908/http://www.ducati.com/bikes/superbike/1199_panigale_r/tech_spec.do |archive-date=2013-07-04 }}</ref> Their published values are typically 5% higher than the [[homologation]] values, in normal running order.
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