Also known as: Chestnut Nature Park, CNP, Chestnut bike trail, Mandai Track 15
Secondary rainforest nature parks bordering the Central Catchment/Bukit Timah Nature Reserve; Chestnut is Singapore's largest nature park (81 ha).

Whether everyone in your group gets a day at Chestnut Nature Park MTB Trails - the grades on offer, the named zones, and how mixed abilities split up.
NParks colour grading: easy, moderately difficult, very difficult, extremely difficult (Chestnut). Bukit Timah rated intermediate to advanced/technical.
Group split: beginners ride Chestnut easy loops / pump track while advanced riders session the Bike Park and Bukit Timah technical sections; Bukit Timah's 23 sections have multiple exit points to skip harder parts.
Chestnut suits all levels (beginner loops, pump track, progressive skills lines) and mixed groups; Bukit Timah better for intermediate-advanced. Both free, near the city.
Forested singletrack over roots, hard-packed soil and rock gardens/drops; built features at Chestnut Bike Park and pump track.
Bukit Timah: fast descents through rock gardens, rock drops and blind corners; technical climbs. Chestnut: progressive skills lines, drop-offs and jumps at the Bike Park; pump track. Exposure low but technical features real.
Directional/one-way MTB signage and section markers (NParks); marked entry/exit points. Follow trail direction and etiquette signs.
Popular with local riders and hikers, busy on weekends; Chestnut MTB and hiking trails are separated.
Year-round, no snow. Trails close/should be avoided when wet or after heavy rain to prevent damage (NParks guidance).
Year-round (equatorial); ride in drier spells. Feb-Apr tend drier; wetter Nov-Jan (NE monsoon).
Heavy tropical downpours, heat and high humidity; slick roots and rock when wet; lightning risk in storms.
Free of charge; no permit or lottery (NParks).
Permits and operators change - confirm before booking.
Chestnut Nature Park off Chestnut Avenue (car parks at Chestnut Ave North/South); Bukit Timah via Hindhede Drive or Dairy Farm Road car parks. Public transport/bus and MRT (e.g. Cashew/Hillview) nearby.
No shuttle (looped trails); ride-up access. Public buses/MRT and car parks serve trailheads.
Helmet required; full-suspension bike best for Chestnut Bike Park / Bukit Timah, hardtail fine for pump track. Good mobile coverage. Bring water; shelters/water points near park entrances. VERIFY on-trail water.
Toilets, bicycle wash points, shelters and car parks at Chestnut; toilets and car parks at Bukit Timah/Hindhede. VERIFY current facilities.
NParks-managed (no operator needed); local bike shops and clubs in the Bukit Timah/Hillview area. VERIFY.
Slippery roots/rock when wet; rock drops and blind corners at Bukit Timah; keep to bike-only trails and avoid riding when wet (trail-damage rules).
Not required; self-guided public trails.
Multiple marked entry/exit points (Bukit Timah's sections allow bail-outs); urban emergency services and hospitals close by.
This profile is desk research, compiled from public sources - not a first-hand mountain-bike network report. Coordinates are approximate.