Join Date: May 2002
Bikes: 2010 Cervelo RS. Marinoni touring bike. Kona Tanuki MTB. Specialized Hardrock (commuter). Raleigh (early 80s) Super Gran Prix.
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I have a Sport/touring bike and as well as thinner framesets, higher gears and shorter chainstays, sport/touring generally have lighter wheels (24-28 spoke) and dual pivot brakes. Where as for loaded touring it would be wise to have a beefier set of wheels (36 spoke) and better brakes for the heavier load (cantis or V brakes).
My sport/touring bike was custom made (Marinoni) and has a triple chainring but with a 52T large ring. The rear cassette is 11-25T. Although I have the braze-ons for front and rear racks I would not be able to carry a huge amount of weight due to the wheel set and brakes, plus the gearing doesn't make it easy for steep hills for loaded touring.
Sport/touring bikes are for lightweight loads/credit card tours, day tours, sag supported tours, fast/long distances (brevets). Can be used for racing if you want, but will have to comprimise on the gearing.