https://devzone.nordicsemi.com/f/nordic-q-a/9479/cumulative-crank-revs-explainedHi, I am wondering about the Cumulative crank revs for service 0x1816 &amp; 0x1818 Cycling Cadence and Speed, Cycling Power Services I dont understand why the crank revs are to be sent out as cumulative values in a 16 bit field.. Does this meanen-USTelligent Community 13Tue, 29 Sep 2015 06:11:47 GMThttps://devzone.nordicsemi.com/thread/35005?ContentTypeID=1Tue, 29 Sep 2015 06:11:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9831750d-8a7e-4002-b18f-b9ccb0ce2c73RK<p>The crank revolutions are sent out as cumulative vales in a 16 bit field because that&#39;s what the bluetooth spec as adopted by the Bluetooth SIG for the service mandates.</p> <p>if you read the full spec, which can be downloaded <a href="https://www.bluetooth.org/docman/handlers/downloaddoc.ashx?doc_id=261449">here</a>, it notes this value can roll over and documents that the collector shall take that into consideration, it also specifies an optional control point for setting it to a known value.</p> <p>The spec doesn&#39;t have the working group&#39;s deliberations, so you can only guess why they did it that way, I would guess it was a tradeoff between utility and packet size.</p><div style="clear:both;"></div>