The Tunnel Gully Bike Trails are part of the Tunnel Gully Recreation Area, nestled at the foot of Mount Climie in Kaitoke Regional Park just north of Upper Hutt.
Back in 2008 the Hutt Valley Mtb Club set about reclaiming tracks around Tunnel Gully in Pakuratahi Forest. Rampant gorse made many unrideable so a brush cutter was purchased with $1000 donation from the Ground Effect Slush Fund to deal with the onslaught.
The NtrailZ crew have been behind a load of trail building to form the Tunnel Gully Bike Trails. Back in 2015 and 2016 the Ground Effect Slush Fund topped up a contribution made by the Greater Wellington Regional Council to help out with trail building projects. The Slush Fund cash donation of $2000 was spent on tools, a wheelbarrow, a plate compactor, and a first aid kit.