New answers tagged ergonomics
Depending on your riding position on the road bike and the commuter bike, you will need up to 4cm wider seats on your commuter bike. Ask a friend to take a picture of you sitting on the bike, and review the picture, to determine your sitting position. See my answer here for the details with pictures: Sitbone width recommendations from SQ Lab
(this is more of a supplemental answer to Pete's one) The answer is somewhat different if you already have back pain vs if you don't. Simply, if you already have pain it's much easier to make it worse, but if you don't an upright bike is fairly unlikely to cause it. The main factor is likely to be how far forward you lean while stilling on the bike, with a ...
The number of comments to your question is becoming quite large, so I thought I'd roll my comments up into an answer (of sorts). You ask whether the seat postures could cause back pains, and whilst I have no specialist knowledge in this area, I'd have to say from a purely empirical viewpoint that the answer must be "no". A lot of people ride a lot of miles ...
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