Bicycle Archive · Specification report

2026 Rocky Mountain Instinct Alloy 50

Velopedia Archive ID 900000083

Overview

Model year	2026
Brand	Rocky Mountain
Model	Instinct Alloy 50
Bicycle type	Mountain
Archive ID	900000083
Original MSRP	$4,399.00
Colors	Grey/Beige; Blue/Blue
Sizes	XS; SM; MD; LG; XL

Frameset

Frame construction	FORM™ Alloy \| Full Sealed Cartridge Bearings \| Press Fit BB \| Internal Cable Routing \| 2-Bolt ISCG05 Tabs \| RIDE-4™ Adjustable Geometry \| 2 Position Axle \| SM - XL = 145mm \| XS = 140mm \| FORM™ Alloy Rear Triangle
Frame material	Aluminum
Fork	RockShox Lyrik Select 160mm \| Charger RC Damper \| 27.5 = 37mm Offset \| 29 = 42mm Offset
Rear shock	RockShox Super Deluxe Select \| Linear XL Air Can \| Sealed Bearing Eyelet \| 20x8mm F Hardware \| XS - SM = 190x45mm \| MD - LG - XL = 210x55mm \| Size-Specific tune in FAQ

Drivetrain

Shifters	Shimano XT
Rear derailleur	Shimano XT
Crankset	Shimano Deore \| 32T \| 24mm Spindle \| Crankarm Length: XS - SM = 165mm \| MD - XL = 170mm
Bottom bracket	Shimano SM-BBMT500
Cassette	Shimano XT 10-51T
Chain	Shimano M6100

Brakes

Brakes	Shimano XT Trail 4 Piston \| Metal Pads

Cockpit & contact points

Headset	FSA ZS56/66 Reach Adjust \| 0mm Cups Installed \| +/- 5mm Cups Included \| Sealed Stainless 36°x45° Bearings \| 30.2mm x 41mm x 6.5mm Upper \| 40mm x 51.8mm x 8.0mm Lower \| 1.5" Crown Race
Handlebar	Rocky Mountain AM \| 780mm Width \| 25mm Rise \| 9° Backsweep \| 5° Upsweep \| 35 Clamp
Stem	Rocky Mountain 35 AM \| 0° Rise \| All Sizes = 40mm
Saddle	WTB Volt Race 142 \| Cromoly rails
Seatpost	Tranz X +RAD1.0 Adjustable Dropper Post \| 30mm Adjustment \| Alloy Clamp Lever \| 30.9mm \| XS = 125mm \| SM = 150mm \| MD = 170mm \| LG - XL = 200mm

Wheels & tires

Hubs	Front: Shimano TC500 \| 15mm Boost; Rear: Shimano TC500 Boost 148mm
Rims	WTB KOM Team i30 TCS 2.0 \| 28H
Spokes	2.0 Stainless
Front tire	Maxxis Minion DHF 2.5 WT 3C MaxxTerra EXO+ Tubeless Ready
Rear tire	Maxxis Minion DHR II 2.4 WT 3C MaxxTerra EXO+ Tubeless Ready
Wheel size	27.5"; 29"

Geometry · SM

Seat tube	365 mm
Effective top tube	572 mm
Head tube	100 mm
Head-tube angle	63.5°
Seat-tube angle	76.5°
Chainstay / rear center	440 - 450
Wheelbase	1198 mm
Bottom-bracket drop	44 mm
Reach	423 mm
Stack	572 mm
Standover height	760 mm

Geometry · MD

Seat tube	410 mm
Effective top tube	621 mm
Head tube	110 mm
Head-tube angle	63.5°
Seat-tube angle	76.5°
Chainstay / rear center	440 - 450
Wheelbase	1227 mm
Bottom-bracket drop	44 mm
Reach	449 mm
Stack	599 mm
Standover height	798 mm

Geometry · LG

Seat tube	440 mm
Effective top tube	640 mm
Head tube	125 mm
Head-tube angle	63.5°
Seat-tube angle	76.5°
Chainstay / rear center	440 - 450
Wheelbase	1259 mm
Bottom-bracket drop	44 mm
Reach	474 mm
Stack	628 mm
Standover height	796 mm

Geometry · XL

Seat tube	470 mm
Effective top tube	649 mm
Head tube	135 mm
Head-tube angle	63.5°
Seat-tube angle	76.5°
Chainstay / rear center	440 - 450
Wheelbase	1293 mm
Bottom-bracket drop	44 mm
Reach	504 mm
Stack	659 mm
Standover height	792 mm

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on October 7, 2026.