My L:R balance two years ago was 58:42. It’s down to 53:47 now after regularly doing single leg deadlifts and single leg squats. (Lots of variety of either to pick from.)
Once I removed the ability of the left leg to dominate, the right leg had no choice but to step up it’s game. And if you do, say, X reps with the stronger leg, you can then push your weaker leg to do the same. It’s a great mental game to get through some otherwise difficult exercises.
I didn’t change anything about my cycling or really ever think about it while riding a bike.
A L/R imbalance is not a problem is a symptom. So I don’t agree with just doing single legs exercises until your left leg get stronger, I do agree with looking for a bike fitter or specialist so you can find the real problem.
Is there is no problem to solve, may be you don’t need to even worry about the imbalance. (But I insist on looking for a problem first, because it’s actually a significant imbalance)
My left right discrepancy started to increase after I was banned from going to gyms (etc) and started doing single legged exercises at home instead (which was around the same time I fell on my good leg as I wrote in the post above)
I don’t think the background you’ve noted rules out LLD. Eg. it could be fall exacerbated an issue with LLD. Also, most people have some LLD of one kind or another.
I think a greater imbalance at lower power’s consistent with LLD too. I struggle to explain exactly why, but I think it’s that mechanics plays more of a role when you’re not actively pushing to maintain your momentum. So when you’re not trying hard to turn the pedals your momentum easily carries you through dead spots and leg length effects the size of the dead spots. As power goes up you need to actively maintain momentum through the pedal stroke and this reduces the imbalance. (Speculative I know, but it’s consistent with Left only PM’s being more accurate at higher power which seems to be common)
I tried pedaling with one foot on an indoor treadmill to strengthen my legs. You can warm up in 15-20 minutes when pedaling with both feet. Then I removed my strong pivot leg and hooked it over the treadmill near where it connected to the rear wheel. Or, you can place it on a chair or stool next to it. I found this set of exercises quite helpful and I have improved a bit. I found this exercise quite useful and I have improved a bit through it.
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