How do bar-end weights change the resonant frequency and reduce vibration?

Resonant frequency is the frequency at which an object "rings" if it is moved. When you hit a tube with a hammer, and listen at the end of the tube, you are hearing the audible portion of its resonant frequency spectrum. The "fundamental" is the lowest note. In handlebars, this is the frequency made by the bars "flapping." By flapping I mean that the bar clamps stay put, while the tips move most. This fundamental frequency is typically the strongest frequency, thus the first one to attack. Weights on the tips of the bars reduce vibration by moving the resonant frequency lower, away from the frequencies generated by the engine. This happens for the same reason that a heavier guitar string sounds lower, under the same tension, than a lighter one. Because the effectiveness of a weight in reducing vibration this way reduces to zero as the weight approaches the bar clamp, I was careful to keep as much weight outboard of the bar ends as possible. All the weight is concentrated where it is most effective- right near the bar-ends. All the weight is within 2.5" of the bar ends. There's no dead weight as with solutions that go all the way through the bars. By moving the resonance lower, it typically moves further from the frequency of the engine, which reduces the build-up of vibration in the bars dramatically. The other way to look at it is in terms of inertia. By solidly mounting the weights to the ends of the bars, the bar-ends gain a great deal of inertia, which means that they are much more reluctant to change speed. Since the flapping motion involves the bar ends accelerating this way and that in rapid succession, any weight on the ends reduces this motion. When you are trying to contain vibration by changing the resonant frequency, solid-mounting is the way to go. Any flexibility to the mounting muddies the effect of the extra weight, hurting the cause.

Request Details

Session Id:12pzre45hxqfj3eot3ful2uzRequest Type:GET
Time of Request:3/30/2020 7:45:28 PMStatus Code:200
Request Encoding:Unicode (UTF-8)Response Encoding:Unicode (UTF-8)

Trace Information

CategoryMessageFrom First(s)From Last(s)
registerIapplications + Adding application 'umbraco.LibraryCacheRefresher
registerIapplications + Adding application 'umbraco.presentation.nodeFactory.UmbracoSiteMapProviderAccessUpdate0.04813190.048132
registerIapplications + Adding application 'UmbracoExamine.UmbracoEventManager2.16904532.120913
registerIapplications + Adding application 'Umbraco.RunwayGallery.ZipUploadHandler2.16975390.000709
umbracoGlobalsettingsreserverd urls: '/config/splashes/booting.aspx,/config/splashes/nonodes.aspx,/ext/,/install/,/umbraco/,/vsenterprisehelper.axd,'2.28091440.111161
aspx.pageBegin PreInit2.33818990.057276
umbracoInithandling request2.35793830.019748
request handlercurrent url '/faq/general/how-do-bar-end-weights-change-the-resonant-frequency-and-reduce-vibration.aspx'2.39660660.038668
umbracoRequestHandlerxpath: '/root/*/* [@urlName = "faq"]/* [@urlName = "general"]/* [@urlName = "how-do-bar-end-weights-change-the-resonant-frequency-and-reduce-vibration"]'2.42203620.025430
umbracoRequestHandlerJust before xPath query (False, '/root/*/* [@urlName = "faq"]/* [@urlName = "general"]/* [@urlName = "how-do-bar-end-weights-change-the-resonant-frequency-and-reduce-vibration"]')2.4221770.000141
umbracoRequestHandlerpageXPathQueryStart: '/root'2.42219520.000018
umbracoRequestHandlerAdding to cache... ('/faq/general/how-do-bar-end-weights-change-the-resonant-frequency-and-reduce-vibration.aspx')2.42357840.001383
umbracoRequestHandlerAfter xPath query2.4236190.000041
umbracoRequestHandlerAccess checking started2.42366770.000049
umbracoRequestHandlerPage not protected2.4320.008332
umbracoRequestHandlerAccess checking ended2.43241250.000413
umbracoInitDone handling request2.4324290.000017
umbracoPageElement loaded: questionText2.43989510.007466
umbracoPageElement loaded: bodyText2.43995440.000059
umbracoPageElement loaded: umbracoNaviHide2.43999760.000043
umbracoPagePagedata loaded for How do bar-end weights change the resonant frequency and reduce vibration? (ID: 1191)2.44001550.000018
templateMaster template is the same as the current template. It would course an endless loop!2.46543340.025418
aspx.pageEnd PreInit2.58084130.115408
aspx.pageBegin Init2.58093610.000095
itemStart parsing 'pageTitle'2.60769030.026754
itemDone parsing 'pageTitle'2.60787330.000183
renderMacroRendering started (macro: Header Images, type: 1, cacheRate: 0)2.67057040.062697
umbracoMacroBefore adding extensions2.8519660.181396
umbracoXsltExtensionExtension added: urn:Exslt.ExsltCommon, ExsltCommon2.87193320.019967
umbracoXsltExtensionExtension added: urn:Exslt.ExsltDatesAndTimes, ExsltDatesAndTimes2.87204140.000108
umbracoXsltExtensionExtension added: urn:Exslt.ExsltMath, ExsltMath2.87209940.000058
umbracoXsltExtensionExtension added: urn:Exslt.ExsltRegularExpressions, ExsltRegularExpressions2.87217690.000078
umbracoXsltExtensionExtension added: urn:Exslt.ExsltStrings, ExsltStrings2.87223820.000061
umbracoXsltExtensionExtension added: urn:Exslt.ExsltSets, ExsltSets2.87228980.000052
umbracoMacroAfter adding extensions2.8731750.000885
umbracoMacroBefore performing transformation2.87442280.001248
umbracoMacroAfter performing transformation3.05577210.181349
renderMacroRendering started (macro: Top Navigation, type: 1, cacheRate: 0)3.06384240.008070
umbracoMacroBefore adding extensions3.09463320.030791
umbracoXsltExtensionExtension added: urn:Exslt.ExsltCommon, ExsltCommon3.09800570.003373
umbracoXsltExtensionExtension added: urn:Exslt.ExsltDatesAndTimes, ExsltDatesAndTimes3.09809120.000086
umbracoXsltExtensionExtension added: urn:Exslt.ExsltMath, ExsltMath3.09813210.000041
umbracoXsltExtensionExtension added: urn:Exslt.ExsltRegularExpressions, ExsltRegularExpressions3.09817030.000038
umbracoXsltExtensionExtension added: urn:Exslt.ExsltStrings, ExsltStrings3.09824560.000075
umbracoXsltExtensionExtension added: urn:Exslt.ExsltSets, ExsltSets3.09828350.000038
umbracoMacroAfter adding extensions3.09831870.000035
umbracoMacroBefore performing transformation3.09841020.000092
umbracoMacroAfter performing transformation3.23413030.135720
renderMacroRendering started (macro: Breadcrumb Nav, type: 1, cacheRate: 0)3.25205140.017921
umbracoMacroBefore adding extensions3.28134920.029298
umbracoXsltExtensionExtension added: urn:Exslt.ExsltCommon, ExsltCommon3.28429650.002947
umbracoXsltExtensionExtension added: urn:Exslt.ExsltDatesAndTimes, ExsltDatesAndTimes3.28438660.000090
umbracoXsltExtensionExtension added: urn:Exslt.ExsltMath, ExsltMath3.28442150.000035
umbracoXsltExtensionExtension added: urn:Exslt.ExsltRegularExpressions, ExsltRegularExpressions3.28445180.000030
umbracoXsltExtensionExtension added: urn:Exslt.ExsltStrings, ExsltStrings3.28448320.000031
umbracoXsltExtensionExtension added: urn:Exslt.ExsltSets, ExsltSets3.28451160.000028
umbracoMacroAfter adding extensions3.28454030.000029
umbracoMacroBefore performing transformation3.28462250.000082
umbracoMacroAfter performing transformation3.33220070.047578
itemStart parsing 'questionText'3.33231380.000113
itemDone parsing 'questionText'3.33242160.000108
itemStart parsing 'bodyText'3.3324560.000034
itemDone parsing 'bodyText'3.33249590.000040
aspx.pageEnd Init3.3331950.000699
aspx.pageBegin InitComplete3.33329430.000099
aspx.pageEnd InitComplete3.33332050.000026
aspx.pageBegin PreLoad3.33333540.000015
aspx.pageEnd PreLoad3.33334860.000013
aspx.pageBegin Load3.33336170.000013
aspx.pageEnd Load3.33959090.006229
aspx.pageBegin LoadComplete3.33969230.000101
aspx.pageEnd LoadComplete3.33970870.000016
aspx.pageBegin PreRender3.33973440.000026
aspx.pageEnd PreRender3.340060.000326
aspx.pageBegin PreRenderComplete3.34008750.000028
aspx.pageEnd PreRenderComplete3.34010170.000014
aspx.pageBegin SaveState3.34172610.001624
aspx.pageEnd SaveState3.35285560.011130
aspx.pageBegin SaveStateComplete3.35289270.000037
aspx.pageEnd SaveStateComplete3.35290880.000016
aspx.pageBegin Render3.35292260.000014
aspx.pageEnd Render3.37096920.018047

Control Tree

Control UniqueIDTypeRender Size Bytes (including children)ViewState Size Bytes (excluding children)ControlState Size Bytes (excluding children)
__PageASP.default_aspx959800
    ctl00ASP.masterpages_faqquestion_master000
        ctl00$ctl00ASP.masterpages_runwaymaster_master000
            ctl00$ctl00$ctl00ASP.umbraco_masterpages_default_master000
                ctl00$ctl00$ctl00$ContentPlaceHolderDefaultSystem.Web.UI.WebControls.ContentPlaceHolder000
                    ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl17System.Web.UI.LiteralControl000
                    ctl00$ctl00$ctl00$ContentPlaceHolderDefault$headSystem.Web.UI.HtmlControls.HtmlHead000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl00System.Web.UI.HtmlControls.HtmlTitle000
                            ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl01umbraco.presentation.templateControls.Item000
                                ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl01$ctl00System.Web.UI.LiteralControl000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl02System.Web.UI.HtmlControls.HtmlMeta000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl03System.Web.UI.HtmlControls.HtmlMeta000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl04System.Web.UI.HtmlControls.HtmlMeta000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl05System.Web.UI.HtmlControls.HtmlMeta000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl06System.Web.UI.HtmlControls.HtmlMeta000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl07System.Web.UI.HtmlControls.HtmlMeta000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl08System.Web.UI.HtmlControls.HtmlLink000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl09System.Web.UI.HtmlControls.HtmlLink000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl18System.Web.UI.ResourceBasedLiteralControl000
                    ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl19System.Web.UI.LiteralControl000
                    aspnetFormSystem.Web.UI.HtmlControls.HtmlForm000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl20System.Web.UI.LiteralControl000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl10System.Web.UI.WebControls.LoginStatus000
                            ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl10$ctl00System.Web.UI.WebControls.LinkButton000
                            ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl10$ctl01System.Web.UI.WebControls.ImageButton000
                            ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl10$ctl02System.Web.UI.WebControls.LinkButton000
                            ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl10$ctl03System.Web.UI.WebControls.ImageButton000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl21System.Web.UI.LiteralControl000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl11umbraco.presentation.templateControls.Macro000
                            ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl12System.Web.UI.WebControls.PlaceHolder000
                                ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl22System.Web.UI.LiteralControl000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl23System.Web.UI.ResourceBasedLiteralControl000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl13umbraco.presentation.templateControls.Macro000
                            ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl14System.Web.UI.WebControls.PlaceHolder000
                                ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl24System.Web.UI.LiteralControl000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl25System.Web.UI.LiteralControl000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl15umbraco.presentation.templateControls.Macro000
                            ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl16System.Web.UI.WebControls.PlaceHolder000
                                ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl26System.Web.UI.LiteralControl000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl27System.Web.UI.LiteralControl000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$RunwayMasterContentPlaceHolderSystem.Web.UI.WebControls.ContentPlaceHolder000
                            ctl00$ctl00$ctl00$ContentPlaceHolderDefault$RunwayMasterContentPlaceHolder$ctl02System.Web.UI.LiteralControl000
                            ctl00$ctl00$ctl00$ContentPlaceHolderDefault$RunwayMasterContentPlaceHolder$ctl00umbraco.presentation.templateControls.Item000
                                ctl00$ctl00$ctl00$ContentPlaceHolderDefault$RunwayMasterContentPlaceHolder$ctl00$ctl00System.Web.UI.LiteralControl000
                            ctl00$ctl00$ctl00$ContentPlaceHolderDefault$RunwayMasterContentPlaceHolder$ctl03System.Web.UI.LiteralControl000
                            ctl00$ctl00$ctl00$ContentPlaceHolderDefault$RunwayMasterContentPlaceHolder$ctl01umbraco.presentation.templateControls.Item000
                                ctl00$ctl00$ctl00$ContentPlaceHolderDefault$RunwayMasterContentPlaceHolder$ctl01$ctl00System.Web.UI.LiteralControl000
                            ctl00$ctl00$ctl00$ContentPlaceHolderDefault$RunwayMasterContentPlaceHolder$ctl04System.Web.UI.LiteralControl000
                        ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl28System.Web.UI.ResourceBasedLiteralControl000
                    ctl00$ctl00$ctl00$ContentPlaceHolderDefault$ctl29System.Web.UI.ResourceBasedLiteralControl000

Session State

Session KeyTypeValue

Application State

Application KeyTypeValue
vnc38ykjnkjdnk2jt98ygkxjngSystem.DateTime3/30/2020 7:45:39 PM
umbracoUrlSystem.Stringwww.manicsalamander.com:80/umbraco
umbracoNeedConfigurationSystem.BooleanFalse

Request Cookies Collection

NameValueSize

Response Cookies Collection

NameValueSize

Headers Collection

NameValue
ConnectionKeep-Alive
Accepttext/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encodingbr,gzip
Accept-Languageen-US,en;q=0.5
Hostwww.manicsalamander.com
If-Modified-SinceTue, 21 Jan 2020 10:24:22 YEKT
User-AgentCCBot/2.0 (https://commoncrawl.org/faq/)

Response Headers Collection

NameValue
X-AspNet-Version2.0.50727
Cache-Controlprivate
Content-Typetext/html

Form Collection

NameValue

Querystring Collection

NameValue

Server Variables

NameValue
ALL_HTTPHTTP_CONNECTION:Keep-Alive HTTP_ACCEPT:text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 HTTP_ACCEPT_ENCODING:br,gzip HTTP_ACCEPT_LANGUAGE:en-US,en;q=0.5 HTTP_HOST:www.manicsalamander.com HTTP_IF_MODIFIED_SINCE:Tue, 21 Jan 2020 10:24:22 YEKT HTTP_USER_AGENT:CCBot/2.0 (https://commoncrawl.org/faq/)
ALL_RAWConnection: Keep-Alive Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Encoding: br,gzip Accept-Language: en-US,en;q=0.5 Host: www.manicsalamander.com If-Modified-Since: Tue, 21 Jan 2020 10:24:22 YEKT User-Agent: CCBot/2.0 (https://commoncrawl.org/faq/)
APPL_MD_PATH/LM/W3SVC/366/ROOT
APPL_PHYSICAL_PATHC:\HostingSpaces\manicsal\manicsalamander.com\wwwroot\
AUTH_TYPE 
AUTH_USER 
AUTH_PASSWORD 
LOGON_USER 
REMOTE_USER 
CERT_COOKIE 
CERT_FLAGS 
CERT_ISSUER 
CERT_KEYSIZE 
CERT_SECRETKEYSIZE 
CERT_SERIALNUMBER 
CERT_SERVER_ISSUER 
CERT_SERVER_SUBJECT 
CERT_SUBJECT 
CONTENT_LENGTH0
CONTENT_TYPE 
GATEWAY_INTERFACECGI/1.1
HTTPSoff
HTTPS_KEYSIZE 
HTTPS_SECRETKEYSIZE 
HTTPS_SERVER_ISSUER 
HTTPS_SERVER_SUBJECT 
INSTANCE_ID366
INSTANCE_META_PATH/LM/W3SVC/366
LOCAL_ADDR64.27.51.218
PATH_INFO/faq/general/how-do-bar-end-weights-change-the-resonant-frequency-and-reduce-vibration.aspx
PATH_TRANSLATEDC:\HostingSpaces\manicsal\manicsalamander.com\wwwroot\faq\general\how-do-bar-end-weights-change-the-resonant-frequency-and-reduce-vibration.aspx
QUERY_STRING 
REMOTE_ADDR34.239.172.52
REMOTE_HOST34.239.172.52
REMOTE_PORT49970
REQUEST_METHODGET
SCRIPT_NAME/faq/general/how-do-bar-end-weights-change-the-resonant-frequency-and-reduce-vibration.aspx
SERVER_NAMEwww.manicsalamander.com
SERVER_PORT80
SERVER_PORT_SECURE0
SERVER_PROTOCOLHTTP/1.1
SERVER_SOFTWAREMicrosoft-IIS/7.5
URL/faq/general/how-do-bar-end-weights-change-the-resonant-frequency-and-reduce-vibration.aspx
HTTP_CONNECTIONKeep-Alive
HTTP_ACCEPTtext/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
HTTP_ACCEPT_ENCODINGbr,gzip
HTTP_ACCEPT_LANGUAGEen-US,en;q=0.5
HTTP_HOSTwww.manicsalamander.com
HTTP_IF_MODIFIED_SINCETue, 21 Jan 2020 10:24:22 YEKT
HTTP_USER_AGENTCCBot/2.0 (https://commoncrawl.org/faq/)

Microsoft .NET Framework Version:2.0.50727.8806; ASP.NET Version:2.0.50727.8762