Yes and mostly climbing. But it’s worth it to carry the extra weight up a hill and be slightly slower because the muscle helps with so many other parts of life. And probably makes riding mountain bikes better too, but I can’t quantify that easily.
Perspective: a few years go I dropped from a skinny-fat 145 down to a race weight of 130-132 pounds at 5-7% BF. Which is just plain skinny. FTP around 4.25w/kg. Was climbing very well. But lost a lot of overall body strength. That wasn’t healthy. Now running 140-145 in season, more like 10-12% BF and lifting year round. I’m slightly slower on the bike and work harder on steep climbs. But heck, life is much better.
5x5 type programming
Find I can lift a couple times a week in season at 70-75% of 1RM without being too beat up. Drop that to 70% and maintaining strength is fine, not too much fatigue, but won’t make lifting gains. If just maintaining, will do 70% 5x5s then every couple weeks throw in a few heavier 1-3 rep sets up to 85% Nothing fancy but lifting year round is important to me now.