Designed to fit SRAM cranksets with removable spiders. Its proprietary design has an ovality of 10% and a timing of 112 degrees after top dead center which provide the beneifits of an oval ring such as greater rear wheel traction without the traditional downsides of oval rings.
3mm offset is designed for boost cranksets (52mm chainline)
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I have really enjoyed using the Range Extender. I appreciate being able to just plug it in when my bike battery is getting low and feel confident I can go another 20 miles!
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