Inner thigh pain

I took my new Giant TCR advanced pro 0 2025 bike out for its maiden voyage last Sunday. I was pain in the muscles at the top inside of your thighs the ones that almost touch together. I’m not sure they might be called abductor muscles and also at the very top of the back of my thighs on my left leg where it meets your buttocks. I’ve never had this on a bike before. I’ve always ridden an endurance road bike before this is my first out and out race bike. I hadn’t been out on a road bike for about 3 months due to a litany of mechanical issues with my BMC roadmachine 2 so I have been found 50 to 60 mile rides on my mountain bike but obviously with how the UK weather has been over the last few months the rides have been sporadic to say the least. The first ride on the TCR was 77.53 miles long so a fair increase on a new bike with a different geometry and bigger gearing. I checked the saddle height last night using the Hamley method my inseam is 31.5” which when multiplied by 1.09 comes to 34.33” so I measured it from the pedal axle to the top of the saddle as it tells you too and it is pretty much bang on 34.33” saddle is roughly in the middle of rails. Does anybody know what could be causing this pain? I am also finding riding a 52/36 crank very hard after being used to a 46/33. Is it just a case of getting used to it ? Or should I downgrade it to a 50/34 compact? Does anybody have any tips? I would be very grateful. I would go for a professional bike fit but I can’t afford it yet as I spent out buying the bike. Could the saddle be partly to blame as I do find the Giant SL particle flow saddle uncomfortable.

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