be engineered to a length that will provide a given amount of stretch when installed on the application. This percentage of stretch varies from material to material. Stretch... recommendations can be found on our Material Comparisons page. The percentage of stretch applied to a belt is arrived at by taking into consideration the tension relaxation... lengths recommended by Pyramid Inc. take into consideration this tension relaxation or decay An example would be when the Pyrathane 83A durometer belt is installed with 10% stretch...

. While the modulus of Pyrathane 88A is higher than our standard 83A material we recommend a similar initial stretch of approximately 10% which will provide increased drive if needed.... Higher or lower stretch percentages can be utilized to increase or decrease the final belt tension. Moderate variations can be used with little effect on belt life. When considering... 88A for your application, and when an initial stretch 10% is utilized, other general information provided in our product brochure will be applicable. Click here for Material...

lower than our 83A material, we would recommend an initial stretch of approximately 12-1/2% which is somewhat higher in order to compensate. This higher initial stretch will provide... approximately the same tension as our 83A material at 10%. When considering 83ASD for your application, and when an initial stretch of 12-1/2% is utilized, other general information...

diameter at belt center Enter 2nd pulley diameter at belt center Enter stretch percentage desired (7.5, 10, 12.5%, etc.) Which Equals around application at belt center. Which... Equals calculated belt length including 0 % stretch. Note: If the diameter of the pulleys at the belt center is unknown add one belt cross section to the diameter of the pulley when...

sections can be manufactured of Pyrathane 83A material. We recommend an initial stretch of approximately 10% which works well on most applications. Higher or lower stretch...