My lower back has been killing me for the last month or so from riding.I think it may be that the bars are up too high (~6cm above saddle). The view is great though.I have been using the Just Ride PBH-11=Seat Height fit method, and the bars as high as one likes method.I have shoved the Brooks saddle all the way back Riv-style, which my knees love, and my hands love, as this makes my weight further back and not on my hands.
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I can feel less than 2mm on seat post height, but what I've found has the most effect on my lower back hurting or not, on any given setup, is the tilt do the saddle. We're talking ANAL here; a quarter turn on one of the seat post screws is sometimes too much. I'd suggest you try that first if you're otherwise comfortable. It'll change the weight distribution on your back.
@JimThill:
@Jim:
I still think switching to a more usable 44-46t big ring will eliminate lots of problems.
Also, it never hurts (well, maybe a little) to strengthen the core muscles with sit-ups, planks, cobras, etc. Riding a bike doesn't really do much for these important muscle groups, and it sounds like these are the muscles that are getting sore.
There may be something to what you are saying about the hamstrings as I noticed the back problem starting when it started to get cold here in Maryland this year and my hamstrings seem to be tighter these days (I do some light regular stretching).
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According to the Rivendell Bleriot sizing chart in the Bleriot Flyer, as posted on the cyclofiend site, I fall smack dab into the 55 size.I was surprised how large I look on it whe I first saw the pics. I had never seen myself on it before and always thought it would look bigger under me.
By the way:I really want to thank everybody for helping me on this. I really appreciate it!Kep it coming if you have any ideas. I need help.