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:osoisibbvwirtb45jmlwql55Request Type:GET
Time of Request:12/6/2019 1:10:15 AMStatus Code:200
Request Encoding:Unicode (UTF-8)Response Encoding:Unicode (UTF-8)

Trace Information

CategoryMessageFrom First(s)From Last(s)
aspx.pageBegin PreInit
umbracoInithandling request0.00014160.000142
request handlercurrent url '/faq/general/how-do-bar-end-weights-change-the-resonant-frequency-and-reduce-vibration.aspx'0.00051630.000375
umbracoRequestHandlerxpath: '/root/*/* [@urlName = "faq"]/* [@urlName = "general"]/* [@urlName = "how-do-bar-end-weights-change-the-resonant-frequency-and-reduce-vibration"]'0.00065150.000135
umbracoRequestHandlerJust before xPath query (False, '/root/*/* [@urlName = "faq"]/* [@urlName = "general"]/* [@urlName = "how-do-bar-end-weights-change-the-resonant-frequency-and-reduce-vibration"]')0.00077870.000127
umbracoRequestHandlerpageXPathQueryStart: '/root'0.00081910.000040
umbracoRequestHandlerAdding to cache... ('/faq/general/how-do-bar-end-weights-change-the-resonant-frequency-and-reduce-vibration.aspx')0.00236030.001541
umbracoRequestHandlerAfter xPath query0.00240760.000047
umbracoRequestHandlerAccess checking started0.002490.000082
umbracoRequestHandlerPage not protected0.00268970.000200
umbracoRequestHandlerAccess checking ended0.00272660.000037
umbracoInitDone handling request0.00275910.000033
umbracoPageElement loaded: questionText0.00329030.000531
umbracoPageElement loaded: bodyText0.00339940.000109
umbracoPageElement loaded: umbracoNaviHide0.00346890.000070
umbracoPagePagedata loaded for How do bar-end weights change the resonant frequency and reduce vibration? (ID: 1191)0.00350870.000040
aspx.pageEnd PreInit0.00485320.001345
aspx.pageBegin Init0.00491550.000062
itemStart parsing 'pageTitle'0.00532350.000408
itemDone parsing 'pageTitle'0.00541760.000094
umbracoMacroMacro loaded from cache (ID: 14, Header Images)0.00707570.001658
renderMacroRendering started (macro: Header Images, type: 1, cacheRate: 0)0.00713980.000064
umbracoMacroBefore adding extensions0.00728410.000144
umbracoXsltExtensionExtension added: urn:Exslt.ExsltCommon, ExsltCommon0.01029560.003012
umbracoXsltExtensionExtension added: urn:Exslt.ExsltDatesAndTimes, ExsltDatesAndTimes0.01039470.000099
umbracoXsltExtensionExtension added: urn:Exslt.ExsltMath, ExsltMath0.01043280.000038
umbracoXsltExtensionExtension added: urn:Exslt.ExsltRegularExpressions, ExsltRegularExpressions0.01046950.000037
umbracoXsltExtensionExtension added: urn:Exslt.ExsltStrings, ExsltStrings0.0105050.000036
umbracoXsltExtensionExtension added: urn:Exslt.ExsltSets, ExsltSets0.01053980.000035
umbracoMacroAfter adding extensions0.01057220.000032
umbracoMacroBefore performing transformation0.01067850.000106
umbracoMacroAfter performing transformation0.01149070.000812
umbracoMacroMacro loaded from cache (ID: 13, Top Navigation)0.01164670.000156
renderMacroRendering started (macro: Top Navigation, type: 1, cacheRate: 0)0.01170120.000055
umbracoMacroBefore adding extensions0.01183180.000131
umbracoXsltExtensionExtension added: urn:Exslt.ExsltCommon, ExsltCommon0.01442090.002589
umbracoXsltExtensionExtension added: urn:Exslt.ExsltDatesAndTimes, ExsltDatesAndTimes0.01449550.000075
umbracoXsltExtensionExtension added: urn:Exslt.ExsltMath, ExsltMath0.01453260.000037
umbracoXsltExtensionExtension added: urn:Exslt.ExsltRegularExpressions, ExsltRegularExpressions0.0145690.000036
umbracoXsltExtensionExtension added: urn:Exslt.ExsltStrings, ExsltStrings0.0146040.000035
umbracoXsltExtensionExtension added: urn:Exslt.ExsltSets, ExsltSets0.01463850.000035
umbracoMacroAfter adding extensions0.01467120.000033
umbracoMacroBefore performing transformation0.01475990.000089
umbracoMacroAfter performing transformation0.0175140.002754
umbracoMacroMacro loaded from cache (ID: 1, Breadcrumb Nav)0.01762270.000109
renderMacroRendering started (macro: Breadcrumb Nav, type: 1, cacheRate: 0)0.01767160.000049
umbracoMacroBefore adding extensions0.01781210.000141
umbracoXsltExtensionExtension added: urn:Exslt.ExsltCommon, ExsltCommon0.02036910.002557
umbracoXsltExtensionExtension added: urn:Exslt.ExsltDatesAndTimes, ExsltDatesAndTimes0.02044710.000078
umbracoXsltExtensionExtension added: urn:Exslt.ExsltMath, ExsltMath0.02050060.000054
umbracoXsltExtensionExtension added: urn:Exslt.ExsltRegularExpressions, ExsltRegularExpressions0.02053970.000039
umbracoXsltExtensionExtension added: urn:Exslt.ExsltStrings, ExsltStrings0.02057450.000035
umbracoXsltExtensionExtension added: urn:Exslt.ExsltSets, ExsltSets0.02060960.000035
umbracoMacroAfter adding extensions0.02064320.000034
umbracoMacroBefore performing transformation0.02071810.000075
umbracoMacroAfter performing transformation0.02162470.000907
itemStart parsing 'questionText'0.02175250.000128
itemDone parsing 'questionText'0.02186670.000114
itemStart parsing 'bodyText'0.02194880.000082
itemDone parsing 'bodyText'0.02202510.000076
aspx.pageEnd Init0.02230850.000283
aspx.pageBegin InitComplete0.02236110.000053
aspx.pageEnd InitComplete0.02239470.000034
aspx.pageBegin PreLoad0.02242790.000033
aspx.pageEnd PreLoad0.02246610.000038
aspx.pageBegin Load0.02249960.000034
aspx.pageEnd Load0.02259680.000097
aspx.pageBegin LoadComplete0.02263310.000036
aspx.pageEnd LoadComplete0.02266610.000033
aspx.pageBegin PreRender0.02269810.000032
aspx.pageEnd PreRender0.0228720.000174
aspx.pageBegin PreRenderComplete0.0229110.000039
aspx.pageEnd PreRenderComplete0.02297010.000059
aspx.pageBegin SaveState0.02560840.002638
aspx.pageEnd SaveState0.02585990.000252
aspx.pageBegin SaveStateComplete0.02590240.000043
aspx.pageEnd SaveStateComplete0.02593810.000036
aspx.pageBegin Render0.02597160.000034
aspx.pageEnd Render0.02949570.003524

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.DateTime12/6/2019 12:20:16 AM
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-Encodinggzip
Accept-Languageen-US,en;q=0.5
Hostwww.manicsalamander.com
If-Modified-SinceWed, 16 Oct 2019 04:57:53 GMT
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:gzip HTTP_ACCEPT_LANGUAGE:en-US,en;q=0.5 HTTP_HOST:www.manicsalamander.com HTTP_IF_MODIFIED_SINCE:Wed, 16 Oct 2019 04:57:53 GMT 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: gzip Accept-Language: en-US,en;q=0.5 Host: www.manicsalamander.com If-Modified-Since: Wed, 16 Oct 2019 04:57:53 GMT 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/default.aspx
PATH_TRANSLATEDC:\HostingSpaces\manicsal\manicsalamander.com\wwwroot\default.aspx
QUERY_STRING 
REMOTE_ADDR18.205.60.226
REMOTE_HOST18.205.60.226
REMOTE_PORT43250
REQUEST_METHODGET
SCRIPT_NAME/default.aspx
SERVER_NAMEwww.manicsalamander.com
SERVER_PORT80
SERVER_PORT_SECURE0
SERVER_PROTOCOLHTTP/1.1
SERVER_SOFTWAREMicrosoft-IIS/7.5
URL/default.aspx
HTTP_CONNECTIONKeep-Alive
HTTP_ACCEPTtext/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
HTTP_ACCEPT_ENCODINGgzip
HTTP_ACCEPT_LANGUAGEen-US,en;q=0.5
HTTP_HOSTwww.manicsalamander.com
HTTP_IF_MODIFIED_SINCEWed, 16 Oct 2019 04:57:53 GMT
HTTP_USER_AGENTCCBot/2.0 (https://commoncrawl.org/faq/)

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