Velopedia Bicycle Archive

2025 Trek Rail+ 9.8 GX AXS T-Type Gen 5

Electric-assist bicycle from the Velopedia specification archive.

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Original MSRP: $8,499.93
Sizes: S; M; L; XL
Colors: Pennyflake
Weight: M - 24.18 kg / 53.31 lbs (with TLR sealant, no tubes)
Geometry: 8 manufacturer sizes
Archive ID: 900000807

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Frameset

Frame Construction	OCLV Mountain Carbon, Removable Integrated Battery (RIB 2.0), tapered head tube, guided internal routing, Motor Armor, angle-adjust headset, Mino Link adjustable geometry, adjustable leverage rate, 34.9mm seat tube, ABP, UDH Boost148, 12 mm thru axle, 160 mm travel
Frame Material	Carbon fiber
Fork	Fox Performance Elite Float 38, Float EVOL air spring, GRIP X damper, tapered steerer, 44mm offset, Boost110, 15mm Kabolt-X axle, 160mm travel
Rear Shock	Fox Performance Elite Float X, 2-position damper, 205mm x 65mm

Drivetrain

Component Group	SRAM GX Eagle AXS, T-Type, 12-speed
Shifters	SRAM AXS POD
Rear Derailleur	SRAM GX Eagle AXS, T-Type
Crankset	SRAM GX, 160mm length
Cassette	SRAM Eagle XS-1275, T-Type, 10-52, 12 speed
Chain	SRAM GX Eagle, T-Type, 12 speed
Pedals	Nylon platform

Brakes

Brakes	SRAM Maven Bronze 4-piston hydraulic disc

Cockpit & Contact Points

Headset	S, M, L, XL: Integrated cartridge bearing, 1-1/8'' top, 1.5'' bottom, angle adjust cup compatible / S, M, L, XL: 1-1/8'' threadless, sealed cartridge bearings
Handlebar	Bontrager Line Pro, OCLV Carbon, 35mm, 27.5mm rise, 780mm width
Stem	Bontrager Line Pro, 35mm, Blendr compatible, 0 degree, 45mm length
Saddle	Verse Short Comp, steel rails, 145mm width
Seatpost	S: Bontrager Line Dropper, 150mm travel, MaxFlow, internal routing, 34.9mm, 410mm length / M, L, XL: Bontrager Line Dropper, 170mm travel, MaxFlow, internal routing, 34.9mm, 450mm length / L, XL: Bontrager Line Dropper, 200mm travel, MaxFlow, internal routing, 34.9mm, 515mm length

Wheels & Tires

Wheels	(F) S: Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 27.5'' / M, L, XL: Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 29'' / (R) Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Boost148, 12mm thru axle, 27.5''
Front Tire	S, M, L, XL: Bontrager Brevard RSL SE, Tubeless Ready, triple compound, aramid bead, 60 tpi, 27.5x2.50'' / M, L, XL: Bontrager Brevard RSL SE, Tubeless Ready, triple compound, aramid bead, 60 tpi, 29x2.50''
Rear Tire	S, M, L, XL: Bontrager Brevard RSL SE, Tubeless Ready, triple compound, aramid bead, 60 tpi, 27.5x2.50'' / M, L, XL: Bontrager Brevard RSL SE, Tubeless Ready, triple compound, aramid bead, 60 tpi, 29x2.50''

Size-specific frame data

Geometry

8 sizes · 17 measurements

Manufacturer-published geometry normalized for consistent archival comparison. Effective top tube and reach remain separate measurements because they describe different aspects of fit.

Measurement	15.5" (S) · High	15.5" (S) · Low	17.5" (M) · High	17.5" (M) · Low	19.5" (L) · High	19.5" (L) · Low	21.5" (XL) · High	21.5" (XL) · Low
Seat tube	380 mm	380 mm	410 mm	410 mm	435 mm	435 mm	470 mm	470 mm
Effective top tube	562 mm	563 mm	591 mm	592 mm	638 mm	639 mm	669 mm	670 mm
Head tube	100 mm	100 mm	100 mm	100 mm	120 mm	120 mm	145 mm	145 mm
Head-tube angle	65°	64.5°	65°	64.5°	65°	64.5°	64.9°	64.5°
Seat-tube angle	77.9°	77.4°	77.7°	77.2°	77.5°	77°	77.4°	76.9°
Actual seat-tube angle	75.3°	74.8°	75.3°	74.8°	75.2°	74.8°	75.2°	74.8°
Chainstay / rear center	446 mm	448 mm	446 mm	448 mm	446 mm	448 mm	446 mm	448 mm
Wheelbase	1201 mm	1202 mm	1229 mm	1230 mm	1277 mm	1278 mm	1313 mm	1314 mm
Bottom-bracket drop	12 mm	18 mm	18 mm	24 mm	17 mm	24 mm	17 mm	24 mm
Bottom-bracket height	345 mm	339 mm	345 mm	339 mm	345 mm	339 mm	345 mm	339 mm
Reach	435 mm	430 mm	455 mm	450 mm	495 mm	490 mm	520 mm	515 mm
Stack	594 mm	598 mm	627 mm	631 mm	645 mm	649 mm	668 mm	672 mm
Standover height	763 mm	758 mm	775 mm	769 mm	775 mm	769 mm	798 mm	779 mm
Fork offset / rake	43 mm	43 mm	43 mm	43 mm	43 mm	43 mm	43 mm	43 mm
Front center	754 mm	754 mm	783 mm	783 mm	831 mm	831 mm	867 mm	867 mm
Trail	119 mm	122 mm	127 mm	131 mm	127 mm	131 mm	127 mm	131 mm
Wheel size	27.5"	27.5"	29"/27.5"	29"/27.5"	29"/27.5"	29"/27.5"	29"/27.5"	29"/27.5"

Geometry source: Trek first-party OCC sizing data ↗ Measurements can vary by configuration, wheel size, or flip-chip position where noted by the manufacturer.