Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Trek
2021 Trek Rail 9.9
Value Guide market data · 2021 Trek Rail 9.9
12-month trend
13%
Direction and magnitude, not judgment
vs. category average
5%
Drops faster than category avg
Price over time - 2021 Trek Rail 9.9
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Rail model years
2021 Rail 9.9 lineup
Overview
About this bike
2021 Trek Rail 9.9 value depends on condition, original build, frame material, service history, and current buyer demand.
Specifications
Frameset
- Shock
- RockShox Deluxe RT3, DebonAir spring, RE:aktiv w/Thru Shaft damper, 230x57.5mm
Drivetrain
- Groupset
- SRAM X01
- Chain
- SRAM XX1 Eagle, 12 speed / SRAM XX1 Eagle
- Crank
- E*thirteen E*spec Race carbon, 34T, 165mm length
- Chainring
- SRAM X-SYNC 2, 34T, alloy
- Rear derailleur
- SRAM X01 Eagle AXS
- Cassette
- SRAM XG-1295 Eagle, 10-50, 12 speed
- Shifter
- SRAM Eagle AXS, wireless, 12 speed
Brakes
- Brake rotor
- Shimano RT86, 6-bolt, 203mm
- Brake
- Shimano XT M8120 4-piston hydraulic disc
Cockpit
- Stem
- Bontrager Line Pro, 35mm, 0 degree, 50mm length
- Handlebar
- Bontrager Line Pro, OCLV Carbon, 35mm, 27.5mm rise, 780mm width
- Saddle
- Bontrager Arvada, austenite rails, 138mm width
- Grips
- Bontrager XR Trail Comp, nylon lock-on / Bontrager XR Trail Elite, alloy lock-on
- Seatpost
- RockShox Reverb AXS, 100mm travel, wireless, 31.6mm, 340mm length / RockShox Reverb AXS, 150mm travel, wireless, 31.6mm, 440mm length / RockShox Reverb AXS, 170mm travel, wireless, 31.6mm, 480mm length
Wheels & Tires
- Hub front
- Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Boost110, 15mm thru axle
- Valve
- Bontrager TLR valve, 50mm / Bontrager TLR valve, 40mm
- Skewer rear
- Bontrager Switch thru axle, removable lever
- Wheel rear
- Bontrager Line Carbon 30, Tubeless Ready, 54T Rapid Drive, 6-bolt, SRAM XD driver, Boost148, 12mm thru axle, 29''
- Tire
- Bontrager SE5 Team Issue, Tubeless Ready, Core Strength sidewall, aramid bead, 60 tpi, 29x2.60''
- Tire part
- Bontrager TLR sealant, 6oz
- Wheel front
- Bontrager Line Carbon 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 29''
- Rim strip
- Bontrager TLR
Pedals
- Pedal
- VP-536 nylon platform
E-System
- Battery
- Bosch PowerTube 625Wh / SRAM AXS battery pack (with charger)
- Charger
- Bosch standard 4A, 100-240V
- Motor
- Bosch Performance CX, magnesium motor body, 250 watt, 85 Nm, 20mph or 32km/h max assist
- Controller
- Bosch Kiox
Accessories
- Computer
- Bosch Kiox
- Seat collar
- Bolt-on, 36.4mm
- E-bike part
- RIB handle Spring loaded plunger / MY18 UCRP RIB BUMPER RUBBER SHORE 40
- Sealant
- Bontrager TLR sealant, 6oz
Frame sizing
XS4'10"-5'2"
S5'2"-5'6"
M5'6"-5'10"
L5'10"-6'2"
XL6'2"-6'6"
M highlighted as most common resale size. Sourced from catalog metadata.
Geometry
- Stack
- Varies by size
- Reach
- Varies by size
- Wheelbase
- Varies by size
Industry standard. Sourced from catalog metadata.
What to check when buying used
Inspection
Drivetrain wear
Check chain stretch, cassette teeth, chainrings, and shifting under load before negotiating price.
Inspection
Wheel condition
Inspect rims, hubs, spokes, and bearing play; ask about the tire age and any prior wheel rebuilds.
Inspection
Service history
Ask for service records covering bearings, brakes, drivetrain, and any frame or fork warranty work.
Inspection
Battery health
Request battery cycle count and any diagnostic report; older packs lose range and capacity.
Inspection
Motor warranty
Verify motor warranty status and any firmware updates from the manufacturer dealer.