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A little help with Trek OCLV geometry(4 posts)

A little help with Trek OCLV geometrysierranevada
Aug 27, 2003 9:20 AM
Looking for an exact top tube length for a 1999 56cm Trek 5200.

Thanks!
56.1cm (nm)Chen2
Aug 27, 2003 10:28 AM
seat tube angle also required...C-40
Aug 28, 2003 5:17 AM
The seat tube angle is 74 degrees. If you are comparing frames (like your old one) to the Trek, a top tube length alone is meaningless.

If your old frame had a 73 degree seat tube angle for instance, you would have to add another 1.2cm to the 56.1cm TT length of the Trek to compare the two frames with the rider in the same position relative to the bottom bracket.
correction...C-40
Aug 28, 2003 5:21 AM
The 56cm Trek has a 73.5 STA, not a 74. The need to include the STA in the comparison is still relevant. Each .5 degree of steeper STA adds .6cm to the effective top tube length.