{"product_id":"shimano-ultegra-8100-power-crank-arms","title":"Shimano Ultegra 8100 Power Crank Arms","description":"\u003cp\u003eThe \u003cstrong\u003eShimano Ultegra 8100 Power Crank Arms\u003c\/strong\u003e bring dual-sided power measurement to the Ultegra 8100 groupset — delivered as crank arms only, so you can pair them with your existing chainring and build out your setup on your own terms. Accuracy sits within ±1.5%, and left-right balance data gives you a clearer picture of how your effort is actually distributed across each pedal stroke.\u003c\/p\u003e\n\u003cp\u003eThese arms use Bluetooth and ANT+ connectivity, making them compatible with a wide range of head units and training platforms. The battery is rated for over 300 hours of ride time and is waterproof, so charging interruptions and weather are rarely going to be your concern. Zero-offset calibration is straightforward — something you'll appreciate when you're standing in a parking lot before a ride rather than fiddling with software at home.\u003c\/p\u003e\n\u003ch3\u003eShimano Ultegra 8100 Power Crank Arms Specs at a Glance\u003c\/h3\u003e\n\u003cul class=\"specs_at_a_glance\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasurement:\u003c\/strong\u003e Dual-sided power, ±1.5% accuracy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnectivity:\u003c\/strong\u003e Bluetooth and ANT+\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery life:\u003c\/strong\u003e Over 300 hours, waterproof\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Shimano 12-speed groupsets (arms only — chainring sold separately)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Shimano","offers":[{"title":"160mm","offer_id":43520582254636,"sku":"IFCR8100PMXXA","price":1325.0,"currency_code":"USD","in_stock":true},{"title":"165mm","offer_id":43520582287404,"sku":"IFCR8100PAXXF","price":1325.0,"currency_code":"USD","in_stock":true},{"title":"170mm","offer_id":43520582320172,"sku":"IFCR8100PCXXA","price":1325.0,"currency_code":"USD","in_stock":true},{"title":"172.5mm","offer_id":43520582352940,"sku":"IFCR8100PDXXA","price":1325.0,"currency_code":"USD","in_stock":true},{"title":"175mm","offer_id":43520582385708,"sku":"IFCR8100PEXXA","price":1325.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/7684\/9196\/files\/shimano-ultegra-8100-power-crank-arms-1616040.jpg?v=1771297273","url":"https:\/\/ricycles.com\/products\/shimano-ultegra-8100-power-crank-arms","provider":"RA Cycles","version":"1.0","type":"link"}