South of Westport and north of Greymouth, the Tiropahi Tram Track is typically ridden as a 25km loop. It is mainly old forest roads and about a quarter singletrack. There are some sections that require hike-a-bike. There are stream and river crossings. Note, the track becomes very soft with rain, therefore it is recommended to mountain bike ride only after a long dry period.
To reach the mountain biking trailhead from Westport, head south on SH67 to SH6. Turn right heading south on SH6 for 18.4km into Charleston. Continue south on SH6 for another 7.8km. Turn left heading east on 4WD track signed for Tiropahi. After 0.2 km, use the small parking area before the river crossing.
Start riding back north on the rolling, winding SH6 for 4.5km. Turn right on unsigned dirt 4WD track (aka Four Mile Road). Follow road and maps to start of track.
Overall, Tiropahi Tram Track is the 38th most popular mountain bike trail of all 41 mountain biking rides in New Zealand.