Marin Bikes

Alpine Trail XR

2021 Marin Alpine Trail XR profile.

See this bike in a different color:

  • Suspension: RockShox Lyrik Ultimate / Rock Shox Super Deluxe Coil Ultimate RCT
  • Size Range: S, M, L, XL

BIG ALL-MOUNTAIN DAYS WHERE TRAVEL AND GEOMETRY MATTER MOST

BUILT FOR ABUSE AND ROWDY RIDING

ENDURO-STYLE RIDING AND RACING

BIG BIKE, BIG WHEELS, BIG FUN

The Alpine Trail is a 29” wheeled full suspension bike built for the all day enduro rider that earns their downhill fun.

Key upgrades from Alpine Trail 7:

  • RockShox Lyrik Ultimate/Super Deluxe coil suspension
  • Shimano SLX/XT drivetrain
  • FSA Gradient crankset

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Specifications

  • Frame

    Series 4 6061 Aluminum Frame, 29” Wheels, 150mm Travel MultiTrac Suspension Platform, Internal Dropper Post and Rear Derailleur Routing, Chainstay Mounted Post Mount Disc Brake, 148x12mm Boost Thru- Axle, 73mm Threaded BB w/ ISCG05 Tabs

  • Front Suspension

    RockShox Lyrik Ultimate, 29”, 160mm of Travel, Air Sprung, Debonair, Charger 2.1, Fast Black Stanchions, 110x15mm Maxle Stealth, 42mm Offset

  • Rear Suspension

    Rock Shox Super Deluxe Coil Ultimate RCT, Coil Spring, Climb Switch, LS Compression and Rebound Adjustment, 205x65mm, Trunnion Upper Mount, 25mmxM8 Lower Mount (S/M = 300lb, L/XL = 450lb)

  • Rims

    Marin Aluminum Double Wall, 29mm Inner, Sleeved Joint, Disc Specific, Tubeless Compatible

  • Hub, Rear

    Shimano HB-MT510B, 148x12mm, Centerlock, Microspline Freehub Body

  • Hub, Front

    Shimano HF-MT410B, 110x15mm, Center\lock

  • Spoke, Nipples

    14g Black Stainless Steel

  • Tires

    Front: Maxxis Assegai 29x2.5”, MAXX TERRA, EXO+, Tubeless Compatible; Rear: Maxxis Assegai 29x2.5”, MAXX GRIP, DoubleDown, Tubeless Compatible

  • Derailleur, Rear

    Shimano XT 12-Speed, SGS

  • Derailleur, Front

    -

  • Shift Lever

    Shimano SLX 12-Speed, I-Spec EV

  • Crankset

    FSA Gradient, Modular 1x, 32T Direct Mount Chainring, MegaTooth Technology, Mego EXO Spindle, Boost Spacing

  • Bottom Bracket

    MEGAEVO BB, 73mm BSA Threaded

  • Chain

    KMC X-12 Silver and Black

  • Cassette

    Shimano SLX M7100 Cassette, 12-Speed, 10-51T

  • Brake, Front

    Shimano BR-MT420, 4-Piston Hydraulic Disc, 203mm Rotor

  • Brake, Rear

    Shimano BR-MT420, 4-Piston Hydraulic Disc, 180mm Rotor

  • Brake Levers

    Shimano BL-M4100 Hydraulic, I-Spec EV Compatible

  • Handlebar

    Race Face Affect R 35, 35mm Clamp, 780mm Width, 20mm Rise, 5º Up, 8º Back

  • Stem

    Race Face Affect R 35, 50mm

  • Grips

    Marin Single Clamp Locking

  • Headset

    FSA No 57, Sealed Cartridge Bearings, 1 1/8" x 1 1/2”

  • Seatpost

    X-Fusion Manic, 1x Composite Remote, Size S 125mm Travel, Size M and L 150mm Travel, Size XL 175mm Travel, 30.9mm

  • Saddle

    Marin Speed Concept

  • Pedals

    -

  • Extras

    Bolt-On Thru-Axle

  • Extras

    Downtube Protector

Specifications, pricing, and availability are subject to change without notice.

Geometry

Alpine Trail XR geometry diagram
S M L XL
Stack 619 628 632 643
Reach 430 455 480 515
Headtube Angle 63.5° 63.5° 63.5° 63.5°
Headtube Length 100 110 115 130
Seattube Angle 78° 78° 78° 78°
Seattube Length 390 400 425 430
Toptube Effective 561.7 589 615 652
BB Height 342 342 342 342
BB Drop 35 35 35 35
Chainstay 430 430 430 430
Wheelbase 1199 1229 1256 1297
Standover Height 714 716 732 734
Fork Offset 42 42 42 42
Seatpost Diameter 30.9 30.9 30.9 30.9
Handlebar Width 780 780 780 780
Stem Length 35 35 35 35
Crank Length 170 170 170 170

All lengths in millimeters

Suspension Setup

REAR SHOCK SETUP

Recommended Sag = 30%/19.5mm

Step 1: Check the coil rate chart. If you are close to the correct rate, go to step two, otherwise swap the spring for one with the correct rate (not provided).

Step 2: Sit on the bike and note the sag. On a RockShox-equipped bike, this can be seen on the shock shaft. You will likely need someone to help you.

Step 3: If sag is less than 30%, back off the preload ring on the spring one turn at at time. If sag is more than 30%, increase the preload on the spring. (Note: Never preload coil more than five turns).

Step 4: Adjust rebound setting to ensure proper control.

For additional information on the setup of RockShox coil shocks, visit SRAM's suspension setup and tuning guide.

FORK SETUP

Marin recommends that all bikes front and rear suspension feel balanced

Step 1: After rear sag is set follow the recommended pressure from the fork manufacturer.

Step 2: Bounce evenly up and down on the bike, cycling the suspension up and down to make sure both front and rear suspension feel balanced, if the front does not match the rear add or release pressure.

Step 3: Once the bike feels balanced adjust the rebound damping to ensure proper control.

RockShox Lyrik setup page >>

Rock Shox Super Deluxe Coil Ultimate RCT

Rider weight and shock setup
LBS KG COIL LB/IN
120 54 300
130 59 300
140 64 300
150 68 350
160 73 350
170 77 350
180 82 400
190 86 400
200 91 400
210 95 450
220 100 450
230 104 450
240 109 500
250 113 500
260 118 500
270 122 500