Knowledge

Motorcycle testing and measurement

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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". Their published values are typically 5% higher than the
234: 246: 258: 325:(or other fuel). Dry weight, in this sense, can directly be used for comparison with (FIM) weight limits, which pertain to the motorcycle in operating condition. It is also part of the homologation tests, and it is found on the EC Certificate of Conformity as unladen mass. This dry weight could also be useful in comparing different models, with different fuel tank capacities. However, manufacturers may also exclude some or all of the following: 25: 349:, the difference between wet weight and manufacturer claimed dry weight is around 70 lb (32 kg). This difference includes around 30 lb (14 kg) of gasoline, 7 lb (3.2 kg) of engine oil, 7 lb (3.2 kg) of coolant, and 9 lb (4.1 kg) of battery. These weights are even larger for bigger motorcycles with higher capacities, complicating comparison between 176: 155:, and the actual performance, expressed by such things as the output of the engine, and the top speed or acceleration of the motorcycle. Most parameters are uncontroversial and claims made by manufacturers are generally accepted without verification. These might include simple measurements like rake, trail, or wheelbase, or basic features, such as the type of brakes or ignition system. 273:, 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. 446:, the machine with the greatest difference between its GVWR and wet weight can safely bear the most additional weight; for instance, camping food and gear, extra fuel, or spare parts. It also indicates that a large rider and passenger might overload the machine even without carrying any additional load, in which case they might need two vehicles for a planned tour. 399:
manufacturers will rarely publish wet weight measurements and inconsistencies will almost always be found between different motorcycle press and media outlets. This is due to different testing techniques, differences in what is being included, and by the organization doing the testing omitting an explanation of how they weighed the motorcycle.
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excluded, and a lack of defining how the test was done. A battery is typically included in the dry weight by manufacturers (with the exception of at least one), but it may not be included by media outlets. On the other hand, some press and media outlets only exclude fuel to define their dry weight. For a typical
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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, it is referred to as "maximum engine power", and manufacturers use similar terms. Historically, this convention may have come from the pre-
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manufacturers and BMW began publishing the wet weight rather than dry, usually providing some explanation for what this means. Since then most other manufacturers have followed, in order to comply with EC directives that explicitly state that the values pertain to the vehicle in running order. Honda
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So there is no standardized way to test the dry weight of a motorcycle. Inconsistencies may be found between a motorcycle manufacturer's published dry weight and motorcycle press and media outlets' published dry weight. This is due to different testing techniques, mainly differences in what is being
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might be excluded during shipping. It is not safe to assume that it is either included or excluded in the reported dry weight. Hydraulic fluid might be found on a particular bike's front brake and reservoir, plus maybe a rear brake with a reservoir, and maybe also in a hydraulic clutch with its own
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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
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There is no global standardized way to test the wet weight of a motorcycle. In the EU, Council Directive 93/93/EEC specifies wet weight as "mass in running order", which includes all equipment normally fitted to a bike such as windscreen, tool kit and at least 90% of its fuel capacity. Motorcycle
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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
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Motorcycle speed tests, especially at high speeds, are prone to variation due to human error, limitations in equipment, and atmospheric factors like wind, humidity, and altitude. The published results of two otherwise identical tests could vary depending on whether the result is reported with or
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Other measurements are often doubted or subject to misunderstandings, and the motorcycling press serves as an independent check on sometimes unrealistic sales and marketing claims. Many of these numbers are subject to variable methods of measurements, or disagreement as to the definition of the
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may however vary from one source to another due to inconsistencies in how testing equipment is calibrated, the method of using that equipment, the conditions during the test, and particularly the location that force and speed are being measured at. The power of the engine alone, often called
227:(primary drive, gearbox and final drive) depends on the details of the design and construction. Generalizing, a chain drive motorcycle may have some 5-20% less power at the rear wheel than at the crankshaft, while a shaft drive model may lose a little more than that due to greater friction. 429:
Gross vehicle weight rating (GVWR) is the manufacturer's stated maximum safe mass of the motorcycle, including its own mass and everything it carries, taking into consideration the tire profile and load capacity; brake, suspension and frame capacity. It is printed on a motorcycle's
493:, but these were banned in racing in the 50s and so are out of fashion among street motorcycles. The adherence to "styling aerodynamics" (as opposed to measurably improved aerodynamics) and ergonomic considerations have affected production motorcycle design. 307:. In contrast, wet and dry weight are unstandardized measurements that refer to the weight of the motorcycle without rider, passengers or cargo, and either with (wet) or without (dry) a varying set of fluids such as fuel or lubricants, and the battery. 519:
The following have been commonly used at one time or another to describe motorcycles. Not all of them apply to every motorcycle, and most sources publish only a subset of this list, while others have unique measurements not seen elsewhere.
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A, factors in the vehicle's frontal area, and thus actual power required to overcome wind resistance. A typical projected frontal area for motorcycles is in the neighborhood of 2.9–3.9 sq ft (0.27–0.36 m). When the
303:. GVWR is the maximum total weight of the motorcycle including all consumables, the rider, any passenger, and any cargo. It is generally well-understood and standardized, being defined by law and overseen by agencies such as the 434:. The difference between GVWR and wet weight is how much the motorcycle can safely carry, including fuel; the rider, passenger and their clothing; cargo; and other accessories. Using this calculation, a typical large 310:
Wet and dry weight are often used to make comparisons between different motorcycles, because all else being equal, a lighter motorcycle will generally perform and handle better than a heavier one.
337:, and this makes such a comparison difficult. When any of these is excluded, the specified dry weight no longer pertains to the motorcycle in running order. Some manufacturers even exclude the 159:
statistic. The parameters most often in contention for motorcycles are the weight, the engine output (power and torque), and the overall performance, especially acceleration, top speed, and
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without industry standard correction factors calculated to compensate for test conditions. Rounding errors are possible as well when converting to/from miles and kilometers per hour.
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Complete analysis of motorcycle aerodynamics would include measurement of drag, lift and side force at various speeds, wind angles, and rider postures; as well as pitching
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describes it as curb weight (aka kerb weight) and says this means the bike is "ready to ride." Others say all fluids are included and the fuel tank is at least 90% full.
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crankshaft power, or power at the crankshaft, will be significantly greater than the power measured at the rear wheel. The amount of power lost due to friction in the
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has in the past used the term "Ducati weight", pertaining to a value excluding the battery as well as all fluids, but have since begun using "dry weight" for this.
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of motorcycles are not as frequently measured by third parties or reported by manufacturers as other figures like power. The dimensionless measure of
233: 1625: 1116:, p. 41 "Most motorcycle companies resist quoting drag coefficients of their products because the numbers look poor compared to cars..." 89: 919: 61: 1049: 68: 1144:, pp. 40–41 "...Not to mention the popularity of giving out the CdA in square meters while forgetting to mention the units..." 995: 75: 1755: 313:
The difference between GVWR and wet weight is how much the motorcycle can safely carry, including the rider, fuel, and other load.
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Another factor making aerodynamic measurements relatively uncommon in the popular press is the lack of access to research-quality
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A figure is reported, it is sometimes in nonstandard units making it hard to compare between motorcycles and automobiles.
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The wet weight of a motorcycle includes, but is not limited to fuel, engine oil, coolant, brake fluid, and battery.
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could be reduced through the use of "dustbin fairings" or fully enclosed and streamlined fairings (like the
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might have a maximum useful payload of 400 pounds (180 kg). This is especially of interest in
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because when comparing motorcycles ridden by the same operator and passenger, clad in the same
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has published wet weights with all consumables on board, but only half a tank of fuel, while
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has recently published specification tables that use the typically automotive-oriented term
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As its weight changes during riding, the dry weight of a motorcycle typically excludes the
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While its weight is small compared to the other fluids discussed above (a few ounces),
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http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:1995:052:0001:0040:EN:PDF
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Braking 60 to 0 mph (97 to 0 km/h), 100 to 0 mph (161 to 0 km/h)
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includes a range of more than two dozen statistics giving the specifications of the
1788: 1763: 1740: 1694: 1523: 977: 504: 458: 415:, and stated that it included full fluid levels and the bike was "ready to ride." 1843: 1768: 1605: 1555: 1533: 803: 685: 490: 361: 215: 137: 863:, vol. 40, no. 10, Irvine, California: Aviation News Corp, p. 2, 1778: 1243:
The Essential Guide to Motorcycle Travel: Tips, Technology, Advanced Techniques
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number of forward gear ratios, and the type of transmission (e.g. "6-speed
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ratings will be highly indicative of its performance. Reported numbers for
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Preparing for a dyno test – note the fan used for engine cooling
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Canet, Don (July 2006), "Tach Truths; Tall tales of the tachometer",
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gives "wet weight (no fuel)" for the 2012 1190RS motorcycle, while
322: 1689: 1662: 1657: 330: 1630: 1600: 1470: 644: 368: 219: 211: 1647: 1620: 1098:"Getting Loaded: How Much Weight Can Your Motorcycle Handle?" 465:, varies from .55 to .65 (comparable to a pickup truck), vs C 408: 207: 203: 175: 167:, the range between charges is often a pivotal measurement. 1366: 1642: 1135: 384: 1217:, vol. 45, no. 7, Newport Beach, California: 1147: 785:- the car and truck equivalent of motorcycle wet weight 1107: 1176: 1174: 885: 883: 49:. Unsourced material may be challenged and removed. 1322:, MotorBooks/MBI Publishing Company, p. 37, 1171: 1880: 880: 1267:, vol. 44, no. 4, Westerville, Ohio: 289:Motorcycle weight is expressed in three ways: 418: 1352: 978:"American Motorcyclist Association > Home" 1095: 920:"Ducati Superbike 1199 Panigale R - Ducati" 1359: 1345: 832:, Source Interlink Media, pp. 34–35, 202:With power typically being the product of 191: 1199:"Aerodynamics 101; What looks fast isn't" 843: 507:, rolling moment, and yawing moment (see 489:prototype) to reduce wake turbulence and 109:Learn how and when to remove this message 1319:Streetbikes: Everything You Need to Know 1295: 1196: 1153: 1141: 1113: 174: 132: 120: 1746:List of long-distance motorcycle riders 1315: 1261:"Packing: What to take, how to take it" 975: 815: 251:Motorcycle rear wheel on a dyno roller. 1881: 1239: 849: 387:gives a "weight without fuel approx." 16:Motorcycle technology and verification 1340: 1282: 1210: 1180: 1165: 1125: 976:Association, American Motorcyclist. 821: 585:0 to 60 mph (0 to 97 km/h) 179:Two motorcycles at a ΒΌ mile (402 m) 58:"Motorcycle testing and measurement" 47:adding citations to reliable sources 18: 1132:A, which has units of square feet." 514: 13: 149:Motorcycle testing and measurement 14: 1900: 1269:American Motorcyclist Association 1021:"1190RS Β« Erik Buell Racing" 281:values, in normal running order. 165:electric motorcycles and scooters 1802:Production motorcycles (by speed 601: mi (0.00 to 0.40 km) 256: 244: 232: 23: 1866:List of outlaw motorcycle clubs 1159: 1119: 1089: 1064: 1042: 1013: 759:bikes with a separate oil tank. 449: 305:US Department of Transportation 34:needs additional citations for 1283:Reeve, Bruce (June 30, 2010), 1219:Hachette Filipacchi Media U.S. 988: 969: 955: 937: 912: 901: 1: 1451:Universal Japanese Motorcycle 1197:Anderson, Steve (June 1999), 1189: 1096:Art Friedman (October 2000), 850:Searle, Dave (October 2009), 390: 316: 1797:Motorcycle land-speed record 822:Ford, Dexter (August 2003), 170: 7: 963:"EUR-Lex - 31993L0093 - EN" 891:"EUR-Lex - 31992L0061 - EN" 771: 737:Gross vehicle weight rating 425:Gross vehicle weight rating 419:Gross vehicle weight rating 292:gross vehicle weight rating 210:, a motorcycle's power and 10: 1905: 1299:Motorcycle Tuning: Chassis 1271:, p. 46, April 1990, 422: 357:motorcycles' dry weights. 263:Graph of power and torque. 195: 1834: 1787: 1754: 1731: 1703: 1581: 1496: 1419: 1383: 1302:, Butterworth-Heinemann, 1246:, Kogan Page Publishers, 633:Vehicle emissions control 284: 1849:List of motorcycle clubs 1223:Bondi Digital Publishing 860:Motorcycle Consumer News 809: 129:on a chassis dynamometer 1573:Testing and measurement 1296:Robinson, John (1994), 1291:– via Sport Rider 1226:(subscription required) 789:Dry weight (automobile) 455:Automotive aerodynamics 374:Beginning in 2009, the 192:Engine power and torque 1406:Motorcycle occupations 1316:Stermer, Bill (2006), 1221: β€“ via  184: 145: 130: 1889:Motorcycle technology 1265:American Motorcyclist 1240:Coyner, Dale (2007), 982:www.amadirectlink.com 755:Typically applies to 674:Motorcycle suspension 178: 142:Bonneville Speed Week 136: 124: 945:"Search Regulations" 43:improve this article 1811:Freestyle motocross 1025:erikbuellracing.com 778:Conversion of units 529:types of motorcycle 511:for descriptions). 509:yaw, pitch and roll 440:touring motorcycles 1102:Motorcycle Cruiser 1050:"Highlights - KTM" 613:Fuel consumption 487:Vetter Streamliner 185: 146: 131: 1876: 1875: 1616:Japanese Big Four 1253:978-1-884313-59-2 895:eur-lex.europa.eu 799:Speedometer error 744:GVWR - Wet weight 558:Compression ratio 538:motorcycle engine 381:Erik Buell Racing 376:Japanese Big Four 271:unit construction 127:Triumph Sprint ST 119: 118: 111: 93: 1896: 1806:by acceleration) 1741:Motorcycle rally 1361: 1354: 1347: 1338: 1337: 1332: 1312: 1292: 1279: 1256: 1236: 1227: 1207: 1184: 1178: 1169: 1163: 1157: 1151: 1145: 1139: 1133: 1123: 1117: 1111: 1105: 1104: 1093: 1087: 1086: 1084: 1082: 1068: 1062: 1061: 1056:. 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Retrieved 924:the original 914: 903: 894: 872:, retrieved 858: 845: 829:Motorcyclist 827: 817: 754: 743: 731: 730:Wet weight 725: 724:Dry weight 683: 671: 670:Suspension 654:Transmission 630: 617:Fuel economy 614: 602: 582: 576: 572:Performance 550: 544: 535: 526: 518: 502: 498:wind tunnels 495: 480: 453: 450:Aerodynamics 428: 412: 402: 401: 397: 394: 373: 367: 359: 355:water-cooled 343: 320: 312: 309: 300: 296: 290: 288: 279:homologation 275: 267: 225:transmission 201: 186: 161:fuel economy 157: 148: 147: 105: 96: 86: 79: 72: 65: 53: 41:Please help 36:verification 33: 1718:Biker films 1511:Accessories 1368:Motorcycles 1214:Cycle World 1204:Cycle World 1081:14 December 1054:www.ktm.com 783:Curb weight 716:Seat height 691:Dimensions 667:Final drive 575:Top speed 564:Lubrication 561:Fuel system 413:curb weight 404:Cycle World 365:reservoir. 335:brake fluid 198:Dynamometer 1668:Moto Guzzi 1529:Suspension 1506:Components 1463:Dual-sport 1391:Definition 1309:075061840X 1190:References 1181:Reeve 2010 1166:Reeve 2010 1126:Reeve 2010 1035:2012-02-09 1006:2013-06-08 930:2013-06-09 874:2010-04-29 852:"Measures" 660:, 5-speed 639:(global), 629:Emissions 391:Wet weight 351:air-cooled 347:sport bike 327:engine oil 317:Dry weight 301:wet weight 297:dry weight 196:See also: 153:motorcycle 69:newspapers 1756:Equipment 1723:Magazines 1476:Motocross 1467:Off-road 1277:0277-9358 1234:0011-4286 869:1073-9408 838:0027-2205 732:see above 726:see above 700:Wheelbase 662:automatic 605:dragstrip 577:see above 551:see above 545:see above 432:VIN Plate 181:dragstrip 171:Top speed 1883:Category 1821:Stunting 1804: / 1626:Kawasaki 1520:Chassis 996:"Ducati" 794:Rounding 772:See also 757:2-stroke 583:Such as 567:Ignition 549:Torque 534:Engine 323:gasoline 295:(GVWR), 1733:Touring 1690:VinFast 1680:Triumph 1663:Aprilia 1658:Piaggio 1653:Peugeot 1566:Fairing 1442:Touring 1432:Cruiser 1428:Street 1401:Museums 1396:History 1376:outline 1076:EUR-Lex 949:dot.gov 721:Weight 682:Tires 596:⁄ 543:Power 525:Class 436:cruiser 339:battery 331:coolant 163:. With 83:scholar 1861:Colors 1826:Trials 1816:Racing 1779:Jacket 1774:Helmet 1636:Yamaha 1631:Suzuki 1601:Ducati 1561:Wheels 1551:Saddle 1541:Engine 1516:Brakes 1498:Design 1486:Trials 1471:Enduro 1458:Custom 1411:Safety 1326:  1306:  1275:  1250:  1232:  867:  836:  739:(GVWR) 710:Height 704:Length 679:Brakes 658:manual 645:FTP-75 643:(EU), 619:& 505:moment 369:Ducati 285:Weight 220:torque 212:torque 85:  78:  71:  64:  56:  1789:Sport 1769:Boots 1764:Armor 1713:Books 1705:Media 1648:Kymco 1621:Honda 1591:Bajaj 1524:Frame 1437:Sport 1421:Types 855:(PDF) 810:Notes 707:Width 647:(USA) 626:Range 591:0 to 409:Honda 333:, or 216:power 208:speed 204:force 90:JSTOR 76:books 1695:Zero 1611:Hero 1534:Fork 1370:and 1324:ISBN 1304:ISBN 1273:ISSN 1248:ISBN 1230:ISSN 1083:2009 865:ISSN 834:ISSN 684:See 672:See 641:NEDC 637:WMTC 635:and 631:see 621:WMTC 615:See 603:See 536:see 527:see 353:and 299:and 218:and 206:and 62:news 1685:TVS 1643:KTM 1596:BMW 461:, C 385:KTM 140:at 45:by 1885:: 1444:/ 1287:, 1263:, 1201:, 1173:^ 1100:, 1074:. 1052:. 1023:. 980:. 947:. 893:. 882:^ 857:, 826:, 664:") 329:, 125:A 1378:) 1374:( 1360:e 1353:t 1346:v 1183:. 1130:d 1085:. 1038:. 1009:. 984:. 965:. 951:. 933:. 897:. 598:4 594:1 483:d 481:C 476:d 474:C 471:d 467:d 463:d 183:. 144:. 112:) 106:( 101:) 97:( 87:Β· 80:Β· 73:Β· 66:Β· 39:.

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Triumph Sprint ST

Suzuki Hayabusa
Bonneville Speed Week
motorcycle
fuel economy
electric motorcycles and scooters

dragstrip
Dynamometer
force
speed
torque
power
torque
transmission
Preparing for a dyno test – note the fan used for engine cooling
Motorcycle rear wheel on a dyno roller.

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