I did the epic kom and radio tower today which is by far the most climbing I’ve done. I was using the small cog on the front (which I rarely do), and on the climbs I was regularly getting what I can only describe as a slight slipping sensation and my power would dip from 3w/kg to 1.4w/kg for 1-2 seconds and then increase back to 3w/kg. This would happen perhaps every 30 seconds.
If I put the bike back into the big cog on the front I didn’t get this sensation once.
I’m new to cycling and zwift so am unsure what could be causing this.
I use a tacx flux s as my direct drive trainer.
Any advice greatly appreciated.