Honestly? It can help — and it's also not the whole story, so don't put your comfort on hold until the scale cooperates.
The mechanics are straightforward: less body weight means less compressive load on your spine and less pressure per square inch where your sit bones meet the seat. Riders who've lost significant weight often say the bike feels better along with everything else. If your doctor has recommended weight loss anyway, riding comfort is one more return on the effort.
But here's what the "just lose weight" crowd skips: plenty of light riders have aching backs too. Some report it's even harsher — less natural padding over the sit bones means the pressure points dig in sooner. Weight is only one input. The others don't care what you weigh:
- Vibration comes up through the seat at every size.
- Geometry — a cramped riding triangle or a long reach to the bars hurts a 150-pound rider the same way it hurts a 250-pound rider.
- The contact point — firm, flat foam concentrates pressure on two small spots regardless of the load on them.
So work on the weight if you and your doctor decide it's the right move — and fix the fit and the seat contact now. You shouldn't have to earn a comfortable ride. Set the bike up for the body you're riding with today, and let any weight loss be a bonus.
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