Ten types of bicycles: Road bicycle, Mountain bicycle, BMX bicycle, Folding bicycle, Cargo bicycle, Tandem bicycle, Recumbent bicycle, Track bicycle, Fatbike, Penny-farthing. A short introduction to frame shapes, wheels, riding positions and distinctive details. A thematic selection, not a ranking by quality, safety or popularity. All ten images are real photographs from Wikimedia Commons. Credits and modifications: File:Simplon Lumen (road bicycle).jpg: Petar Milošević; CC BY 4.0; https://creativecommons.org/licenses/by/4.0; https://commons.wikimedia.org/wiki/File:Simplon_Lumen_(road_bicycle).jpg; Scaled and letterboxed without cropping. File:Mountain bicycle.jpg: Redjar at English Wikipedia; CC BY-SA 3.0; http://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File:Mountain_bicycle.jpg; Scaled and letterboxed without cropping. File:Bicicleta BMX.jpg: Hitmanbmx; Public domain; Public domain; https://commons.wikimedia.org/wiki/File:Bicicleta_BMX.jpg; Scaled and letterboxed without cropping. File:Brompton bicycle 3.jpg: Alicjajoanna; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Brompton_bicycle_3.jpg; Scaled and letterboxed without cropping. File:Bertus Bakfiets 01.jpg: Andrej Shadura; CC BY 4.0; https://creativecommons.org/licenses/by/4.0; https://commons.wikimedia.org/wiki/File:Bertus_Bakfiets_01.jpg; Scaled and letterboxed without cropping. File:Tandem bicycle red.jpg: 4RB; CC BY 2.0; https://creativecommons.org/licenses/by/2.0; https://commons.wikimedia.org/wiki/File:Tandem_bicycle_red.jpg; Scaled and letterboxed without cropping. File:Recumbent bicycle Toxy CL.jpg: EvaK; CC BY-SA 2.5; https://creativecommons.org/licenses/by-sa/2.5; https://commons.wikimedia.org/wiki/File:Recumbent_bicycle_Toxy_CL.jpg; Scaled and letterboxed without cropping. File:Look Baanfiets.jpg: Mette; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0; https://commons.wikimedia.org/wiki/File:Look_Baanfiets.jpg; Scaled and letterboxed without cropping. File:2018 Trek Farley EX 9.8 Full Suspension Fat Bike.jpg: Vlad vm; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:2018_Trek_Farley_EX_9.8_Full_Suspension_Fat_Bike.jpg; Scaled and letterboxed without cropping. File:Penny-farthing.JPG: Jacek Rużyczka; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Penny-farthing.JPG; Scaled and letterboxed without cropping. Adapted visuals and original contributions to this version are offered under CC BY-SA 4.0: https://creativecommons.org/licenses/by-sa/4.0/. The source images retain their stated licenses; no ownership of the originals is claimed.