Sore Shoulders and over Extending

Ok im age 50 - but very active -
However after a few hours riding I'm waking up next few days with sore shoulders and arms - the outsides of the tops of my shoulders hurt.
Im 6,2 riding a trek mountain bike approx £500 - the over stretching is killing me - now on a normal bike yo can extend a stem - can you do same on a mountain bike.
trek 3900 xl frame.
or do I get new handle bars I ride off road some and do reds on ocassion - can you extend a stem and still control a bike or perhaps i get a new bile with less reach how do i measure rearch on the top frame.?
thanks
John
However after a few hours riding I'm waking up next few days with sore shoulders and arms - the outsides of the tops of my shoulders hurt.
Im 6,2 riding a trek mountain bike approx £500 - the over stretching is killing me - now on a normal bike yo can extend a stem - can you do same on a mountain bike.
trek 3900 xl frame.
or do I get new handle bars I ride off road some and do reds on ocassion - can you extend a stem and still control a bike or perhaps i get a new bile with less reach how do i measure rearch on the top frame.?
thanks
John
0
Posts
Is the bike the right size ? Stems can be swapped to help fit but the frame is where you need to start.
any pics of you on the bike side on ?
Stem extemsion.
It could be that the frame is too big for you, but I'm not familiar with Trek sizing. For reference I am 6' tall and ride a M Giant Anthem. I am smack on the borderline between M and L for Giant sizing but found the reach on the L to be too much for me.
As Fenix asked above, could you post a couple of pictures of the bike side on with you on it in your normal riding position?
And it all promised so so much”
Giant Trance 2 27.5 2016 ¦ Sonder Broken Road 2021¦ Giant Revolt Advanced 2 2019 ¦ Giant Toughtroad SLR 1 2019 ¦ Giant Anthem 3 2015 ¦ Specialized Myka Comp FSR 2009