Lower Back Ache after Long Rides

Can anyone advise what my problem might be?
I count myself as reasonably fit (for a 47 year old, that is ), and every weekend, I will cycle up to 50 miles on an outing. I am not a member of a cycling club, so all these trips are solo.
Once a fortnight, I'll go out on a longer ride (up to 100 miles), and it seems that, for any distance over 60 miles, my back begins to ache quite painfully. The last few miles are always a "mind over matter" exercise.
Is it because I'm too old, is my bike set up incorrectly or have I just got a dodgy back?
I ride Trek road bikes (a Madone 5.2 and an aluminium 1.5), but I have never been "fitted" to the bike. I love the long rides, but I'm worried that my back simply isn't up to it.
I count myself as reasonably fit (for a 47 year old, that is ), and every weekend, I will cycle up to 50 miles on an outing. I am not a member of a cycling club, so all these trips are solo.
Once a fortnight, I'll go out on a longer ride (up to 100 miles), and it seems that, for any distance over 60 miles, my back begins to ache quite painfully. The last few miles are always a "mind over matter" exercise.
Is it because I'm too old, is my bike set up incorrectly or have I just got a dodgy back?
I ride Trek road bikes (a Madone 5.2 and an aluminium 1.5), but I have never been "fitted" to the bike. I love the long rides, but I'm worried that my back simply isn't up to it.
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XC/RR'ing + Training Blog
Might be worth looking at your position to check that you're not too stretched out. Maybe move the seat forward - get a shorter stem - raise the stem, or any number of other things.
As said above, a stronger core should allow you a lower comfortable position.
I couldn't understand why being stretched would cause lower back pain. I could understand being too bent over or a too high/low seat position but not being stretched.
Anyway I've just bought a new bike(2nd hand, normal road bike) and once again lower back pain and probably worse. I rode on it for about 3 weeks then couldn't stand it any more. I measured and copied the reach measurements of my tt bike and found that I was only about 3-4cm more stretched. I put the seat forward again to get exactly the same measurements. Guess what, no lower back pain!
As I said, don't know why but for me a few cm too much extension causes real problems (for me).
The lesson I've learnt is to keep on trying new positions, but when you find one that works make sure you note the measurements so you can always come back to it, subtle changes can make a big difference.
Try regular stretching and do some core exercises, if you don't see any improvement then go see a sports physio
Carbon 456
456 lefty
Pompino
White Inbred
Wii Fit is good for this. (Seriously)
Also the site he gives a link too is good
I took up yoga for a while to improve core strength that was good
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