650B all-condition bikes without limits The Doppler offers riders a traditional brevet and touring bike with smooth-rolling 650B tires that can venture into the dirt for those off-road excursions. While gravel riding is the latest trend, 650B wheels have been a well-kept secret within the brevet community for decades! 650B offers a distinct advantage by offering a larger-volume tire to provide both greater cushion and traction on rough roads. The smaller-diameter 650B rims also provide a stronger wheel, which is ideal for loaded touring or harsh conditions. Compared to the Inversion and Radar, the Doppler frame offers a more classic road bike geometry while still offering a high level of functionality with a wide-range drivetrain and frame features.

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Semi-compact geometry: Breezer butted chromoly frame with BSA threaded bottom bracket, Breeze-Thru dropout and Apex disc brake mount - Breezer butted chromoly 100x12mm thru-axle fork with side water bottle, fender, and rack mounts - Tubeless-compatible 650B wheelsets…

Description from Bikealot.