Routes
- Johanneswasserfall Trail & Felsalm Trail - mtb, network lcn, operator Tourismusverband Obertauern, 17.5 km, ascent 552 m, descent 556 m
- John the Baptist (T2.5) - mtb crosscountry, network Friends of Hurtwood, 0.9 km, ascent 0 m, descent 39 m
- Johnnos - mtb, 0.8 km, ascent 11 m, descent 25 m
- Jones Trail - mtb crosscountry, 1.4 km, ascent 10 m, descent 10 m
- Jones/Whites/Thomas Creeks Trail System - mtb crosscountry
- Jonstrup Vang - mtb allmountain
- Jorge Francisco Arango Trail (MTB) - mtb, operator Greenville County Rec, 9.4 km, ascent 251 m, descent 250 m
- Josie Heath Trail - mtb, 1.7 km, ascent 44 m, descent 61 m
- Jouppilanvuoren kävely- ja maastopyöräilyreitti - mtb, network lcn, 7.7 km, ascent 29 m, descent 29 m
- Judges' Ride - mtb, 28 km, ascent 273 m, descent 273 m
- Juffinger Jöchl Runde - mtb, 11.1 km, ascent 595 m, descent 596 m
- Juice Tree - mtb, network lcn, 1.8 km, ascent 4 m, descent 51 m
- Juiced - mtb, 2.4 km, ascent 96 m, descent 47 m
- Julians Trail - mtb freeride, 1 km, ascent 1 m, descent 30 m
- Julien Absalon - mtb, network lcn, 29 km, ascent 640 m, descent 640 m
- Jump Line - mtb, operator Stadt Ilmenau, 2.7 km, ascent 4 m, descent 172 m
- Jump Trail - mtb, operator Moscow Area Mountain Biking Association, 1.2 km, ascent 3 m, descent 90 m
- Jumping Jackaroo Track - mtb allmountain, 3.2 km, ascent 121 m, descent 2 m
- Jumpline - mtb, network lcn, 0.9 km, ascent 6 m, descent 81 m
- Jumpline - mtb, network lcn, operator Familienarena Bucklige Welt-Wechselland, 1.4 km, ascent 5 m, descent 114 m
- Jumpline - mtb, operator Bikearena Silbersattel
- Jumplinie - mtb downhill, operator Freeride Club Herten e.V.
- Jumps - mtb, 0.1 km, ascent 0 m, descent 1 m
- Junction Track - mtb allmountain, 4.4 km, ascent 53 m, descent 151 m
- Junges Plantage - mtb, network lcn
- Jungle Adventure - mtb downhill, 0.1 km, ascent 0 m, descent 13 m
- Junior Burger - mtb
- Junk Drawer - mtb, network lcn, 3 km, ascent 102 m, descent 135 m
- Junk-Trav-Connector - mtb, network lcn, ascent 0 m, descent 0 m
- Junkyard - mtb, 0.7 km, ascent 0 m, descent 83 m
- Jura Bike - Étape 1 - mtb, network ncn, operator Mountainbikeland Schweiz
- Jura Bike - Étape 2 - mtb, network ncn, operator Mountainbikeland Schweiz, 31.4 km, ascent 930 m, descent 870 m
- Jura Bike - Étape 3 - mtb, network ncn, operator Mountainbikeland Schweiz, 40.5 km, ascent 1100 m, descent 1058 m
- Jura Bike - Étape 4 - mtb, network ncn, operator Mountainbikeland Schweiz, 31.8 km, ascent 1008 m, descent 481 m
- Jura Bike - Étape 5 - mtb, network ncn, operator Mountainbikeland Schweiz, 45.1 km, ascent 614 m, descent 595 m
- Jura Bike - Étape 6 - mtb, network ncn, operator Mountainbikeland Schweiz
- Jura Bike - Étape 7 - mtb, network ncn, operator Mountainbikeland Schweiz
- Jura Bike - Étape 8 - mtb, network ncn, operator Mountainbikeland Schweiz
- Jura Bike - Étape 9 - mtb, network ncn, operator Mountainbikeland Schweiz
- Jurassic Bike (707) - mtb crosscountry, network rcn
- Jurslabanan MTB - mtb, 16.9 km, ascent 226 m, descent 225 m
- Just in time - mtb, 1.1 km, ascent 37 m, descent 23 m
- Justanice Trail - mtb, network lcn, operator Finale Outdoor Region, 2.5 km, ascent 60 m, descent 311 m
- Justin - mtb, network rcn, 26.8 km, ascent 1233 m, descent 1233 m
- Južný trail - mtb, network rcn, 2.7 km, ascent 40 m, descent 121 m
- Jyderup skov MTB track - mtb, 2.1 km, ascent 10 m, descent 10 m
- K - mtb crosscountry
- K Dražejovu - mtb, network lcn, operator Kokořínské stezky z.s., 1.7 km, ascent 14 m, descent 6 m
- K1 MTB-Strecke Kindberg – GH Ochnerbauer - mtb, 12 km, ascent 439 m, descent 440 m
- K2 - mtb, 8.6 km, ascent 446 m, descent 422 m
- K2 MTB-Strecke Kindberg – Suppenberg - mtb, 13.5 km, ascent 493 m, descent 494 m
- K3 MTB-Strecke Kindberg – Zeller - mtb, 16.4 km, ascent 600 m, descent 600 m
- K4 MTB-Strecke Kindberg – Herzogberg - mtb, 17.5 km, ascent 590 m, descent 590 m
- K5 Aichberg – Scheibsgraben - mtb, 9.7 km, ascent 374 m, descent 370 m
- Kaczawskie Ścieżki - Dłużek - mtb, network lcn, operator POMBA
- Kaczawskie Ścieżki - Dwa Wąwozy - mtb, network lcn, operator POMBA, 6 km, ascent 114 m, descent 114 m
- Kaczawskie Ścieżki - Gozdno 1 - mtb, network lcn, operator POMBA
- Kaczawskie Ścieżki - Gozdno 2 - mtb, network lcn, operator POMBA, 3.3 km, ascent 97 m, descent 49 m
- Kaczawskie Ścieżki - Okole - mtb, network lcn, operator POMBA
- Kaczawskie Ścieżki - Okole zjazd - mtb, network lcn, operator POMBA, 1.2 km, ascent 2 m, descent 66 m
- Kaczawskie Ścieżki - Ostrzyca - mtb, network lcn, operator POMBA, 4 km, ascent 120 m, descent 159 m
- Kaczawskie Ścieżki - Pod Grzybkami - mtb, network lcn, operator POMBA, 4.3 km, ascent 67 m, descent 68 m
- Kaczawskie Ścieżki - Pod Ostrzycą - mtb, network lcn, operator POMBA
- Kaczawskie Ścieżki - Zielonki - mtb, network lcn, operator POMBA, 4.8 km, ascent 75 m, descent 74 m
- Kafeneion - mtb, 1.4 km, ascent 0 m, descent 136 m
- Kaffe-racet - mtb, 3.1 km, ascent 17 m, descent 18 m
- Kahlenbergerdorf-Strecke - mtb
- Kaibling Runde - mtb, network lcn
- Kaiser Parodi - mtb, 2.2 km, ascent 173 m, descent 1 m
- Kaiser Trail - mtb, 1 km, ascent 0 m, descent 91 m
- Kaiser-Tour - mtb
- Kaiseralm - mtb, operator Land Tirol
- Kaiserhaus-Gufferthütte - mtb, operator Tirol, 15.8 km, ascent 862 m, descent 112 m
- Kaiserhausrunde - mtb crosscountry, operator Tirol, 48.6 km, ascent 1321 m, descent 1332 m
- Kaiserkogel-Strecke - mtb, 20.4 km, ascent 518 m, descent 518 m
- Kaiserniederalm - mtb crosscountry, operator Tirol, 6 km, ascent 621 m, descent 38 m
- Kaiserspitzstrecke - mtb, 35.3 km, ascent 770 m, descent 764 m
- Kaiserwald - mtb, operator Land Tirol
- Kaitlalm/Reiteralm-Runde - mtb, operator Berchtesgadener Land
- Kalamunda Circuit - mtb crosscountry, network rcn, 21.1 km, ascent 393 m, descent 399 m
- Kalas Cup Varingskollen - mtb crosscountry, operator CK Nittedal
- KalasCup Fossum - mtb crosscountry, operator Fossum IL
- KalasCup Greverud - mtb crosscountry, operator Follo SK
- KalasCup Heggedal - mtb crosscountry, operator Asker CK
- KalasCup Skullerud - mtb crosscountry, operator IF Frøy
- Kalbenalm - Sechszeiger - mtb, operator Land Tirol, 12.8 km, ascent 4 m, descent 1195 m
- Kalepa Ridge MTB Trail - mtb
- Kalkalpentour - mtb, network rcn, 118.3 km, ascent 3628 m, descent 3645 m
- Kalksteinalmen - mtb crosscountry, operator Tirol, 11.2 km, ascent 908 m, descent 49 m
- Källvikens Svarta - mtb, operator Biking Dalarna, 8.3 km, ascent 278 m, descent 264 m
- Kaltenbach - Kapaunsalm - mtb
- Kaltenbach-Gasthof Talblick - mtb crosscountry, operator Tirol, 8.1 km, ascent 9 m, descent 648 m
- Kaltenbach-Gasthof Tannenalm - mtb crosscountry, operator Tirol, 6.6 km, ascent 4 m, descent 492 m
- Kaltenbach-Jausenstation Almluft - mtb crosscountry, operator Tirol, 7.9 km, ascent 20 m, descent 687 m
- Kaltenleutgeben-Strecke - mtb, 21.3 km, ascent 564 m, descent 566 m
- Kalugapasset - mtb crosscountry
- Kalvária - mtb, 0.6 km, ascent 0 m, descent 82 m
- Kamasutrail - mtb downhill, 1.9 km, ascent 9 m, descent 317 m
- Kambodża - mtb downhill, 1.5 km, ascent 2 m, descent 304 m
- Kameňák - mtb, network lcn, operator OZ Slobodný bajker, 1.2 km, ascent 16 m, descent 166 m