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Last, the front bar is hollow, how does thgat effect it's "stiffness" compared to the solid rear bar?
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there are calculators out there, but a hollow bar is usually not that (20-30%) far off from a solid bar. it happens that way since a bars rate for say a 1.25" .25 wall bar is the rate of a 1.25" solid bar minus the .75" bar to make it hollow. my new bar is a 1.5 hollow, which is almost 40% greater in rate than a 1.25" solid. plus its lighter.
also, you must take into account the length of the bars arms. go to
www.1speedway.com for a list of bar sizes, arm lengths and rates.
Tim