Training this winter

I suppose I want growth. At the moment I am doing what you said, low reps and high weight. Normally around 15 reps, using a 30kg barbell, one after the other. I'm just wondering - is it counterproductive to follow this routine daily - do my muscles need to rest, even if they aren't aching? I am not 100% focused on becoming faster on the bike, I just want to balance out my upper and lower body muscles. Do you think it's worth following what i'm doing right now, only working my muscles to exhaustion during each session, so they're rough the next day? Or maybe it's better to do little and often? Or is it basically nothing to worry about, as the results will be the same..

low reps would be 3-5 (singles are for showing off or power lifters)

15 would be considered high

8-12 is best to cause hypertrophy (an increase in muscle size)

5-8 is best for strength adaptations

To get stronger most people will need to build muscle mass which tends to be the first major adaptation after you have learnt to co-ordinate an exercise correctly (which is where the first big gains in perceived strength come from), after that its mainly neural which takes time and a lot of hard work using heavy weights or big gears.

If you are able to weight train every day, then you are not training hard enough, 3 times a week would be a lot, especially if you are doing other training eg riding your bike.

Make sure you are getting enough protein in if you are doing this volume of training.