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@gbj_tester
Several reasons. Mostly the UCI wouldn't like it, but also making a drive to a centreless wheel is really hard when you have to gear up, you end up with a spur gear train which is dramatically less efficient than a simple roller chain as currently used. Centreless wheels also suffer from huge bearing friction compared with conventional hubs. Shortening the wheelbase is undesirable, as the front wheel would be off the ground even for a pursuit start, and the bike would be unmanageable for sprinting.