/ road bike set up/ groin strain?
Could be a number of things but it probably is set up and hopefully easy to resolve.
Check your saddle is level, if it's tilting up it will be putting pressure on your perenium which could be causing the pain.
Check your saddle height too. Do you know how to do this accurately?
checked height and tilt...it is more of a strain than pressure/pain as you described
Do you drop it into a higher gear every now and again and stand up out of the saddle for a couple of hundred metres to give everything down there a rest?
maybe not as much as i should do
perhaps over stretching due to seatpost too high?
That was my first thought but he's checked that.
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