For road bikes, your torso will form a 45-degree angle with your hips, and a 90-degree angle with your arms. If you have tight hamstrings or short arms, you can swap out the stem to bring the handlebar closer and keep the strain off your back and shoulders.
For mountain and hybrid bikes , these exact angles are not as critical since the riding positions are often more upright and relaxed. With mountain bikes especially, more time is spent out of the saddle, so dialing in the perfect seated pedaling position isn’t as crucial.
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" Many thanks for the bike fit on Saturday I'm really pleased on how it went , with the adjustments made the TT position now feels more aero but more relaxed in that position , I've done a 70 min session tonight going in and out of position throughout to get gently used to it , I went out for a quick 90 mins late yesterday and the saddle height and cleat wedges feel really good on my road bike , looking forward to an FTP test and racing again , thanks for the adjustment info ."