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Join Date: Aug 2009
Location: Minneapolis
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Bikes: 2022 Salsa Beargrease Carbon Deore 11, 2020 Salsa Warbird GRX 600, 2020 Canyon Ultimate CF SLX disc 9.0 Di2, 2020 Catrike Eola, 2016 Masi cxgr, 2011, Felt F3 Ltd, 2010 Trek 2.1, 2009 KHS Flite 220
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Yeah, check that your HRM is working properly. Make sure the strap is sufficiently tight. Also, at high temperatures and low humidity, one can get odd effects if the strap is not making good contact with your skin (not damp) or is experiencing effects associated with static electricity from your jersey. the latter two are more likely early in a ride.