Routes
- Iron Tor Loop - mtb, 5.7 km, ascent 0 m, descent 0 m
- Ironbarks Singletrack - mtb, 2.3 km, ascent 26 m, descent 55 m
- Irpin forest - mtb, network lcn, 6.3 km, ascent 54 m, descent 35 m
- Irrsee Runde - mtb, network lcn, operator Salzkammergut Tourismus, 58.4 km, ascent 1138 m, descent 1138 m
- Irsta - mtb crosscountry
- Isallo Extasi - mtb, network lcn, operator Finale Outdoor Region, 5.9 km, ascent 953 m, descent 54 m
- Isards - mtb, network rcn, operator Centre BTT Valls d'Àneu, 7.7 km, ascent 369 m, descent 368 m
- ISH - mtb, 0.6 km, ascent 15 m, descent 3 m
- Iskmo-Jungsund vandringsled - mtb, operator Föreningen Iskmosunden rf
- Isola Farnese - Cassia bis - mtb crosscountry, 8.5 km, ascent 173 m, descent 236 m
- Isomäki mtb - mtb, 6.3 km, ascent 9 m, descent 9 m
- Isone Bike - mtb, network lcn, 25.6 km, ascent 1063 m, descent 1081 m
- Issalo - mtb, network lcn, operator Finale Outdoor Region, 0.1 km, ascent 0 m, descent 1 m
- Isskogel-Wilde Krimml - mtb crosscountry, operator Tirol
- It Rocks - mtb
- IT01 - Giro della Veuva - mtb, network lwn, 4.9 km, ascent 337 m, descent 417 m
- IT08 - Limone - San Maurizio - mtb, network lwn, 2.5 km, ascent 152 m, descent 155 m
- IT17 - Morel-Limonetto - mtb, network lwn, 2.2 km, ascent 1 m, descent 287 m
- Itchen Valley Off Road Cycle Route - mtb, network lcn, 2.5 km, ascent 19 m, descent 17 m
- Ithkopf Trail - mtb, network lcn, operator Coppenbrügge, 0.3 km, ascent 0 m, descent 15 m
- Itinerari el Cordal de Sant Ramon - mtb, network lcn, operator Ajuntament de Sant Boi de Llobregat, 2.5 km, ascent 187 m, descent 109 m
- Itinerario ciclabile - Cocca - mtb, 2 km, ascent 0 m, descent 250 m
- Itonskopf Tour - mtb, network rcn
- Itsy Bitsy - mtb, operator Järvsö Bergscykel Park AB, 0.4 km, ascent 0 m, descent 65 m
- IVB MTB 6 Hoch Hinaus - mtb, operator Trailsurfers BW
- IVB MTB Tour 1 Stadtwaldrunde - mtb, operator DAV Sektion Heilbronn, 27.4 km, ascent 542 m, descent 546 m
- IVB MTB Tour 2 Salzweg - mtb, operator RC Pfeil Neckarsulm
- IVB MTB Tour 3 Paradies Tour - mtb, operator Paul-Distelbarth-Gymnasium
- IVB MTB Tour 4 Burgen Tour - mtb, operator s'Radl-Eck Untergruppenbach, 30.6 km, ascent 602 m, descent 599 m
- IVB MTB Tour 5 Hoch Oben - mtb, operator Gemeinde Wüstenrot, 36.2 km, ascent 851 m, descent 852 m
- Ivon Wilson Park MTB (Te Anau) - mtb crosscountry
- IXC Downhill Strecke 2022 - mtb, operator ILRC Ilmenau
- iXS Downhill - mtb, operator Bikepark Bad Wildbad, 1.4 km, ascent 5 m, descent 282 m
- iXS Downhill - mtb downhill, 2.3 km, ascent 0 m, descent 403 m
- Izerska Pętla - mtb, network lcn, 44.9 km, ascent 843 m, descent 842 m
- J11 Mountain Bike Trail - mtb, network lcn, 0.8 km, ascent 2 m, descent 1 m
- J2 - mtb crosscountry, 3.9 km, ascent 42 m, descent 73 m
- Jaama Trail (mtb) - mtb, network rcn
- Jaama Trail: Joensuu-Lykynlampi - mtb;hiking, network lcn;lwn, 15.4 km, ascent 62 m, descent 37 m
- Jabłonowski Cross - mtb, network lcn, 13.4 km, ascent 36 m, descent 34 m
- Jack O' Diamonds - mtb, network lcn, 2.9 km, ascent 73 m, descent 126 m
- Jack the Ripper - mtb, network lcn
- Jack's Route - mtb, 1.5 km, ascent 20 m, descent 61 m
- Jackanna - mtb crosscountry, 3.2 km, ascent 81 m, descent 134 m
- Jackie Brown - mtb crosscountry, network Friends of Hurtwood, 1 km, ascent 3 m, descent 21 m
- Jacks Ridge Trail - mtb crosscountry, ascent 0 m, descent 0 m
- Jackson Singletrack - mtb allmountain, 3.6 km, ascent 82 m, descent 265 m
- Jafferau - mtb crosscountry, 19.8 km, ascent 294 m, descent 1764 m
- Jagahäusl-Straubing-Westendorf - mtb crosscountry, operator Tirol, 14.2 km, ascent 406 m, descent 395 m
- Jägers Notweg Trail - mtb, operator Land Tirol, 1.7 km, ascent 107 m, descent 151 m
- Jägerweg Spezialtour - mtb, network lcn, 17.6 km, ascent 320 m, descent 321 m
- Jägerweg Spezialtour (gekürzt) - mtb, network lcn, 15.4 km, ascent 287 m, descent 288 m
- Jahn - mtb trail, network lcn, 1.2 km, ascent 66 m, descent 16 m
- Jahoda - mtb, operator KE.CY, 1.8 km, ascent 29 m, descent 63 m
- Jaizkibel - mtb, 3.8 km, ascent 83 m, descent 85 m
- Jakobsbergsmilen - mtb trial
- Jalapeno - mtb, 0.4 km, ascent 1 m, descent 35 m
- Jammin - mtb allmountain, 0.4 km, ascent 1 m, descent 31 m
- Jamtal - mtb crosscountry, operator Tirol, 10.1 km, ascent 2 m, descent 583 m
- Jandri - mtb enduro, 4.4 km, ascent 3 m, descent 573 m
- jango - mtb, network lwn, 1 km, ascent 11 m, descent 109 m
- Jano - PCAL2 - mtb, network mtb, operator Distretto turistico Appennino Parma-Est
- Jánosháza - RábaRing - Écs - mtb, 7.7 km, ascent 77 m, descent 196 m
- Jantov FR trail - mtb, 0.2 km, ascent 10 m, descent 0 m
- Janževski vrh - mtb, network lcn, 13.3 km, ascent 297 m, descent 455 m
- Jarafuel, Muela de Juey y el Castillico - mtb, network lcn, operator Comunidad Valenciana
- Järavallens mountainbikeslinga - mtb, network lcn, 6.6 km, ascent 36 m, descent 33 m
- Jardins extraordinaires - mtb
- Járok - mtb, operator AHOJ Bike Park, 0.2 km, ascent 0 m, descent 7 m
- Jarrah Jaunt - mtb crosscountry, 3.8 km, ascent 10 m, descent 59 m
- Jasse - mtb downhill, 2.4 km, ascent 5 m, descent 322 m
- Jausenstation Trojer Alm - mtb, operator Land Tirol, 4.8 km, ascent 36 m, descent 432 m
- Jausenstation Wase - mtb, operator Land Tirol, 2.7 km, ascent 1 m, descent 252 m
- Java Monter - mtb, 0.2 km, ascent 2 m, descent 10 m
- Javello Trail - mtb, network lwn, 3.4 km, ascent 27 m, descent 284 m
- Jedi - mtb
- jeho_michalkov - mtb, operator KE.CY, 5 km, ascent 99 m, descent 222 m
- Jeizi Enduro - mtb, network lcn, 7.1 km, ascent 879 m, descent 4 m
- Jelenia stopa - mtb, 2.2 km, ascent 138 m, descent 27 m
- Jens Trail - mtb, network lcn, operator Sektion Neumarkt i. d. Oberpfalz des Deutschen Alpenvereins e.V., 0.2 km, ascent 0 m, descent 19 m
- Jequitibá - mtb
- Jeremy's - mtb downhill, 0.2 km, ascent 0 m, descent 24 m
- Jerra K9 - mtb crosscountry
- Jerra MTB - mtb allmountain
- Jerry Line - mtb, 5.1 km, ascent 5 m, descent 340 m
- Jesse's Armadillo Access - mtb, network lcn, operator US:AR:Bentonville, 0.1 km, ascent 2 m, descent 2 m
- Jesse's Armadillo Connector - mtb, network lcn, operator US:AR:Bentonville, ascent 0 m, descent 0 m
- Jesse's Last Stand - mtb, network lcn, operator US:AR:Bentonville, 0.4 km, ascent 2 m, descent 27 m
- Jestřáb - mtb allmountain / enduro, 1.9 km, ascent 20 m, descent 157 m
- Jestřebice - Pokličky - mtb, network lcn, operator Kokořínské stezky z.s., 1 km, ascent 0 m, descent 49 m
- Jetpack - Downhill Only - mtb, 0.2 km, ascent 4 m, descent 0 m
- Jewell Park - mtb, operator THOR
- Jigsaw - mtb, 0.4 km, ascent 9 m, descent 7 m
- Jim's Track - mtb crosscountry, 1.2 km, ascent 46 m, descent 29 m
- Jippi - mtb, 0.9 km, ascent 20 m, descent 57 m
- Jochberg Ost - mtb crosscountry, operator Tirol
- Jochbergalm Runde - mtb crosscountry, operator Chiemgauer Genuss-Radltouren, 15.4 km, ascent 799 m, descent 797 m
- Joe's Ridge - mtb, 3 km, ascent 127 m, descent 5 m
- Johanka - mtb
- Johannes-Konath-Eiche - Einstieg Ranzenpuffertour - mtb, network lcn, 13.8 km, ascent 102 m, descent 136 m