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Hi. I’m looking for some help with UR pulleys. I just found two brand new pullies in my collection that I purchased some time ago, but they are somewhat different. As you can see in the photos, they are essentially identical except for the size of the front pulley. I guess this makes for a different rate of “underdrive” for the front driven accessory. Can anyone advise on the applications and why I might want to use one over the other? Number of ribs, offset, and timing mark appear to be identical. Thanks in advance! "> ">
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