Bicycle Archive · Specification report

2026 Trek Roscoe 8 Gen 4

Velopedia Archive ID 900000749

Overview

Model year	2026
Brand	Trek
Model	Roscoe 8 Gen 4
Bicycle type	Mountain
Archive ID	900000749
Original MSRP	$2,399.99
Colors	Dark Star; Lava
Sizes	S; M; ML; L; XL
Weight	M - 14.18 kg / 31.27 lbs (with TLR sealant, no tubes)

Frameset

Frame construction	Alpha Platinum Aluminum, tapered head tube, ZS headset, internal derailleur & dropper post routing, ISCG 05, threaded BB, UDH, 148x12mm thru axle
Frame material	Aluminum
Fork	S: Fox Rhythm 36, Float EVOL air spring, GRIP damper, tapered steerer, 44mm offset, Boost110, 15mm Kabolt axle, 150mm travel / M, ML, L, XL: Fox Rhythm 36, Float EVOL air spring, GRIP damper, tapered steerer, 44mm offset, Boost110, 15mm Kabolt X axle, 150mm travel

Drivetrain

Component group	Shimano Deore, 12-speed
Shifters	Shimano Deore M6100, 12 speed
Rear derailleur	Shimano Deore M6100, long cage
Crankset	Shimano MT512, 30T ring, 55mm chainline, 170mm length
Bottom bracket	Shimano BB-MT501 BSA
Cassette	Shimano Deore M6100, 10-51, 12 speed
Chain	Shimano Deore M6100, 12 speed

Brakes

Brakes	Shimano 4-piston hydraulic disc, M6100 lever, M6120 caliper

Cockpit & contact points

Headset	S, M, ML, L, XL: FSA Orbit, sealed cartridge bearing, 1-1/8'' top, 1.5'' bottom, 1.5 crown / S, M, ML, L, XL: 1-1/8'' threadless, sealed cartridge bearings
Handlebar	S: Bontrager alloy, 31.8mm, 15mm rise, 750mm width / M, ML, L, XL: Bontrager Comp, alloy, 31.8mm, 40mm rise, 780mm width
Stem	S: Bontrager Comp, 31.8mm, 7 degree, 35mm length / M, ML, L, XL: Bontrager Comp, 31.8mm, Blendr compatible, 7 degree, 50mm length
Saddle	Bontrager Verse P3, steel rails
Seatpost	S: TranzX JD-YSI34, 150mm travel, internal routing, 31.6mm, 456mm length / M, ML: TranzX JD-YSI34, 170mm travel, internal routing, 31.6mm, 500mm length / L, XL: TranzX JD-YSI34, 200mm travel, internal routing, 31.6mm, 565mm length

Wheels & tires

Hubs	(F) Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Boost110, 15mm thru axle / (R) Bontrager alloy, sealed bearing, 6-bolt, Rapid Drive 108, Shimano freehub, Boost148, 12mm thru axle
Wheels	Bontrager Line TLR 30
Rims	S: Bontrager Line TLR 30, 27.5'' Tubeless Ready, 28-hole, Presta valve / M, ML, L, XL: Bontrager Line TLR 30, 29'' Tubeless Ready, 28-hole, Presta valve
Front tire	S: Bontrager Brevard Pro XR, Tubeless Ready, dual compound, aramid bead, 60 tpi, 27.5x2.50'' / M, ML, L, XL: Bontrager Brevard Pro XR, Tubeless Ready, dual compound, aramid bead, 60 tpi, 29x2.50''
Rear tire	S: Bontrager Brevard Pro XR, Tubeless Ready, dual compound, aramid bead, 60 tpi, 27.5x2.50'' / M, ML, L, XL: Bontrager Brevard Pro XR, Tubeless Ready, dual compound, aramid bead, 60 tpi, 29x2.50''

Geometry · 15.5" (S)

Seat tube	330 mm
Effective top tube	575 mm
Head tube	90 mm
Head-tube angle	65°
Seat-tube angle	75°
Actual seat-tube angle	73.1°
Chainstay / rear center	425 mm
Wheelbase	1139 mm
Bottom-bracket drop	45 mm
Bottom-bracket height	311 mm
Reach	415 mm
Stack	604 mm
Standover height	714 mm
Fork offset / rake	37 mm
Trail	125 mm
Wheel size	27.5"

Geometry · 17.5" (M)

Seat tube	375 mm
Effective top tube	611 mm
Head tube	100 mm
Head-tube angle	65°
Seat-tube angle	75°
Actual seat-tube angle	73.1°
Chainstay / rear center	430 mm
Wheelbase	1186 mm
Bottom-bracket drop	61 mm
Bottom-bracket height	312 mm
Reach	440 mm
Stack	644 mm
Standover height	735 mm
Fork offset / rake	44 mm
Trail	125 mm
Wheel size	29"

Geometry · 18.5" (ML)

Seat tube	400 mm
Effective top tube	614 mm
Head tube	105 mm
Head-tube angle	65°
Seat-tube angle	76°
Actual seat-tube angle	74.1°
Chainstay / rear center	430 mm
Wheelbase	1203 mm
Bottom-bracket drop	61 mm
Bottom-bracket height	312 mm
Reach	455 mm
Stack	648 mm
Standover height	740 mm
Fork offset / rake	44 mm
Trail	125 mm
Wheel size	29"

Geometry · 19.5" (L)

Seat tube	425 mm
Effective top tube	632 mm
Head tube	120 mm
Head-tube angle	65°
Seat-tube angle	76°
Actual seat-tube angle	74.1°
Chainstay / rear center	430 mm
Wheelbase	1224 mm
Bottom-bracket drop	61 mm
Bottom-bracket height	312 mm
Reach	470 mm
Stack	662 mm
Standover height	740 mm
Fork offset / rake	44 mm
Trail	125 mm
Wheel size	29"

Geometry · 21.5" (XL)

Seat tube	450 mm
Effective top tube	655 mm
Head tube	145 mm
Head-tube angle	65°
Seat-tube angle	77°
Actual seat-tube angle	75.1°
Chainstay / rear center	430 mm
Wheelbase	1265 mm
Bottom-bracket drop	61 mm
Bottom-bracket height	312 mm
Reach	500 mm
Stack	684 mm
Standover height	740 mm
Fork offset / rake	44 mm
Trail	125 mm
Wheel size	29"

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on August 23, 2026.