Join Date: Jan 2008
Location: Minneapolis MN.
Bikes: Santana, Raliegh Sports,Trek 950,Bridgestone CB-Zip.Steamroller.
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Yes tou could be heavy, I have the same issue but am shorter 5'10 240, the causes are varied but most common is the design of the overall gearing, you should not be useng the extreme ranges in any of the front chain rings.
Outer Ring = 1st position thru 5th on most systems
Middle ring = 3rd position thru perhaps you can get the second to last but hardly ever the last .
Inner Ring = 4th thru last.
Sheldon's gear chart will allow you to work out the progressions for your specific drivetrain,but no your bike is never going to "work" in every/ any gear combination.
You should "never" respace the front deralieur with the minor exception of after a crash,somebody worked really hard on the Physics and it should work right if set up and used properly.