Hi

I think my pedaling isn't smooth enough. When doing one legged drills on the turbo trainer, I can maintain 90 rpms for something like 30-40 seconds on left leg, about 20-30 seconds for the right leg. My legs should have the same length, I'm told by a doctor.

My balance isn't very good either, when I look over my shoulders on the road, I make a swing and can't maintain a straight line, not good in the peloton.

One of the best answers I have found by googling is to start riding on rollers. I'm thinking about doing roller drills something like 2 x 30-45 minutes (on the recovery days) each week.

What do you think, is this going to help my pedaling and balance?

Yup. If you haven't bought them yet, get a set with resistance. Totally worth the money. You want to learn to make a completely smooth sound on the rollers, no rrrRRRrrrRRR. Once you get used to them, you can do one-legged drills on the rollers. My standard drill is 2 minutes each leg @ 50-55 cadence, legs together 2 minutes at 90-95 cadence in zone 2, 2 minutes each leg @80-85 cadence, 2 minutes legs together again, repeat until cooked, though no point in going over 45 minutes of it. Warm up and cool down with easy spinning. Do the slow ones and legs together in the same gear. Use a small gear for the fast ones.

If you can't do 2 minutes without stopping, do 2 minutes with stopping until you can. It's supposed to hurt like the very devil. Ignore the pain and just do it. Once a week.