Join Date: Mar 2004
Bikes: rockhopper, delta V, cannondale H300, Marin Mill Valley
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The stem is adjustable. If your dad and brother share your concern, they can start with lowering the stem angle. If that doesn't do it, a different stem would be the next step. Lower and/or longer stem will put them in a less upright position. The handlebar on that bike doesn't look like it has a lot of rise, so changing to flat bars will not make a big difference, but might be part of the solution. Trekking bars allow a choice of positions. I believe you can install trekking bars with the open part forward which I think would result in a more forward leaning torso.
If they are comfortable and enjoy the bikes as is, I wouldn't worry them about it.