Originally Posted by oilman_15106
While we're on the subject of 650 wheels. Someone asked me on a group ride why tri bikes had 650 wheels? Did not have a good answer.
650c wheels help with rider aerodynamics. They provide an effectively lower head tube allowing for lower placement of the handlebars. Its not realy about wheel aerodynamics. They have gone a little out of fashion with larger frames because in the larger sizes you can get the head tube low enough with 700c wheels so there is no need for 650c wheels.
Regards, Anthony