Marin Bikes

Alpine Trail Carbon 2 Frame Kit

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2021 Marin Alpine Trail Carbon 2 frame kit profile.

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  • Original price : $2,349.00
  • Sale: Price: $1699.00*
  • Suspension: Fox Float X
  • Wheel Size: 29"
  • Size Range: S, M, L, XL
  • Manufacturer’s suggested retail price may not include additional shipping or preparation charges. Please contact your local Marin dealer for a quote.

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.

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Specifications

  • Frame

    Unidirectional Carbon Fiber Front Triangle, Series 4 Alloy Rear End, 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

  • Rear Suspension

    Fox Float X Performance, 2 Position Compression Adjustment, Rebound Adjustment, 205x65mm, Trunnion Upper Mount, M8x25mm Lower Mount

  • Headset

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

  • Extras

    Marin MTB Seat Clamp, Bolt Type

  • Extras

    Bolt-On Thru-Axle

  • Extras

    Downtube Protector

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

Geometry

Alpine Trail Carbon 2 Frame Kit 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 690 694 695 698
Fork Offset 44 44 44 44

All lengths in millimeters

Technology

Marin Alpine Trail XR AXS rear triangle detail.

MULTITRAC 2 LT

MultiTrac 2 LT debuts on the aluminum-framed Alpine Trail alloy models. MultiTrac 2 LT shifts from seatstay pivots to chainstay pivots, ensuring that the suspension performance matches our design goals, which are not achievable using pivots located on the seatstay once travel exceeds 150mm. With MultiTrac 2 LT, the benefits of relocating the rear pivot points from the seatstay to the chainstay become apparent, as it reduces anti-rise, allowing for better chassis control while braking, more mid-stroke support, and better feel at bottom out.

Marin Alpine Trail chainstay flip chip detail.

ADJUSTABLE GEOMETRY

With the integrated flip chips, adjustable headset and an aftermarket 29” rear wheel, Alpine Trail aluminum riders can select 12 unique configurations to run their bikes. These configurations allow the best fine-tuning of chassis to trail conditions available. Flip chips are easy to reconfigure trailside and easily done using a 6mm hex wrench, require no additional parts, and incorporate laser-etched graphics that indicate the position of the chips. The stock 27.5” rear wheel can be swapped out for a 29” rear wheel (not included) if desired, along with changing the position of the seatstay flip chips. Furthermore, the flip chips located at the seatstay pivots alter the bottom bracket height and chainstay length (low BB/long CS setting = 345/442mm, high BB/short CS setting = 352/435mm) so that riders can perfectly dial their bike in to match the terrain they are looking to conquer.

Marin Alpine Trail Bear Box downtube storage.

Bear Box Downtube Storage

The all-new Alpine Trail aluminum models now feature our Bear Box integrated downtube storage, complete with a custom nylon bag with a weather-sealed zipper. The hatch door is secure and double-sealed, with bottle bosses. Keep your riding essentials safe and protected from the elements during your big ride.

Marin Alpine Trail XR AXS headtube detail.

ADJUSTABLE HEADTUBE ANGLE

Using our proprietary headset cups and inserts, the headtube angle on Alpine Trail aluminum models can be adjusted to +0.75° or -0.75° from the standard 63° position, giving the rider three options.

Marin Alpine Trail protection details.

PROTECTION

Chainstay and seatstays are protected with durable rubber guards that minimize noise and protect paint finishes, and integrated downtube guards helps deflect errant rocks, logs, or anything else riders may encounter on the trail.

Additionally, all aluminum frame models include a gasket around the cable exit hole reduces noise and prevents the brake hose and derailleur cable from marring the frame, and a mudflap positioned over the lower suspension pivot keeps spray and muck off the bearings. Cable ports are of an all-new design and keep the frame innards sealed. These ports use rubber membranes punctured during initial assembly and seal around the housing or hose once inserted. They will be available as a service part for when riders make changes to their components.

Marin Alpine Trail Carbon 2 profile.

29" F&R WHEELS

The Alpine Trail Carbon was built upon a 2 x 29" wheel setup, for the utmost in climbing efficiency and ability to roll over whatever lays before you on the trail.

Detail image of Alpine Trail Carbon tube

UNIDIRECTIONAL CARBON FIBER FRAME

Alpine Trail Carbon 1 and 2 models feature high modulus carbon fiber and monocoque construction to deliver the strongest and stiffest Alpine Trail to date.

Marin Alpine Trail one piece rocker link detail.

ONE PIECE ROCKER LINK

The Alpine Trail Carbon utilizes a stout one piece rocker link for maximum frame rigidity and suspension performance, while also allowing for bridgeless seatstays for enhanced clearance.

Marin Alpine Trail downtube protector detail.

DOWNTUBE PROTECTION

Alpine Trail Carbon models have an integrated and replaceable downtube protector to fend off inevitable log/rock/whatever strikes that may occur when out on a rowdy ride.

Marin Alpine Trail Carbon 2 front 3/4.

MODERN GEOMETRY

Alpine Trail Carbon models are designed with 63.5° headtube and 78° seattube angles that make the bike well-suited to both the descents as well as the climbs.

Marin Alpine Trail chainstay protector detail.

CHAINSTAY PROTECTION

The chainstays on Alpine Trail Carbon models feature an aggressive chainstay protector that not only protect your frame from chain slap, but also quiet the ride.

Suspension Setup

REAR SHOCK SET UP

Recommended Sag = 30%/19.5mm

Step 1: Set correct pressure in rear shock.

Step 2: Sit on the bike and cycle the suspension (*with correct riding gear).

Step 3: Reset O-ring and sit on the bike, DO NOT BOUNCE, carefully step off.

Step 4: Measure sag (from o-ring to seal of shock), If it does not match the bike’s recommended sag in millimeters repeat process.

Step 5: Adjust rebound setting to ensure proper control.

FORK SET UP

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.

Fox Float X

Rider weight and shock setup
LBS KG PSI
120 54 106
130 59 116
140 64 128
150 68 140
160 73 152
170 77 164
180 82 176
190 86 188
200 91 202
210 95 216
220 100 230
230 104 245
240 109 260
250 113 275
260 118 291
270 122 308

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