Join Date: Apr 2003
Location: Perlas ng Silanganan
Bikes: Custom Knolly Chilcotin Limited Edition Orange, Dartmoor Wish, KHS 7500, Custom built Specialized Camber, S-Works Road, Cannondale Trail mtb, Polini MTB
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There are lots of guys who can fit you (they use lots of gadgets to do this) with years of experinece.
I have not tried using this devices yet, but here's what i learned..
Find a bike that really fits you well(the one that you are comfortable of riding at your own pace). Use that bike as a benchmark for your choices..
Measure the Toptube, Seattube, Stays, Wheelbase, stem, etc....
Also measure the "reach" (saddle - center of handlebar --- i think this should take care of the seattube and headtube angle issues) and standover height.
Just bring a steel tape when you shop for a new bike/frame and measure..
Please take note that 54cm size from one manufacturer might not be exactly the same on another. So let this be your guide(It is mine BTW).