2016 Trek Stache 9 29+ mtn bike. 18.5 virtual 17.5 actual size. See list for full specs. Very nice and fun bike. 

Specifications

FRAMESET
FrameAlpha Platinum Aluminum, E2 tapered head tube, internal derailleur & dropper post routing, PF 92, Midstay, Boost148, Stranglehold dropouts, G2 GeometryFront suspensionManitou Magnum 34 Pro, air spring, E2 tapered steerer, Boost110, G2 Geometry w/51mm offset, 110mm travelSizes15.5, 17.5, 18.5, 19.5, 21.5"

WHEELS
TiresBontrager Chupacabra, Tubeless Ready, aramid bead, 29x3.0"

DRIVETRAIN
ShiftersSRAM X1, 11 speedRear derailleurSRAM X1, Type 2CrankSRAM X1 1400, 30T X-SyncCassetteSRAM XG-1175, 10-42, 11 speedChainSRAM PC 1130

COMPONENTS
SaddleBontrager Evoke RXL, hollow Ti railsSeatpostKS eThirty Integra, remote lever, 2-bolt head, 31.6mm, zero offset, internal routingHandlebarBontrager Rhythm Pro, OCLV Carbon, 31.8mm, 15mm riseStemBontrager Rhythm Pro, 31.8mm, 7 degreeHeadsetFSA IS-2, E2, sealed alloy cartridgeBrakesetShimano Deore XT 
hydraulic disc

Asking $3350