Hey guys,
So I have a second hand 52 cm road bike which by what I went from should be right as I am 5ft 5 inches. However on very intensive rides like going up new hills etc or even longish distances I get lower back pain to the point of crippling that I have to pull over and get off the bike. The stem on it currently is 115mm and while on the hoods I can see the hub behind the bars. I also feel slightly stretched out. Weirdly, I never experience this pain on the trainer, only while out on the road. Do I need to strengthen my core? I can't afford a bike fit and also tight on money so need to decide on proper stem length before I buy!
I have included pics of my position while holding hoods and drops. I am getting quite annoyed now. And to move the saddle very far forward it goes past the max lines.
https://m.imgur.com/a/Gs6mS
Thank you!