Marin Bikes

Alpine Trail XR Frame Kit

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Marin Alpine Trail XR frameset profile.

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  • Price: $1,849.00 (USD)*
  • Suspension: RockShox Super Deluxe Ultimate
  • Wheel Size: Mixed 29"/27.5"
  • Frame: Aluminum
  • Size Range: S, M, L, XL
  • Manufacturer’s suggested retail price may not include additional shipping or preparation charges and does not include applicable US sales tax. Please contact your local Marin dealer for a quote.

The all-new Alpine Trail series is our boldest and most capable line of enduro bikes ever, built upon our most advanced, most adjustable frames to date.

Series 4 aluminum MultiTrac 2 LT frames feature mixed 29”/27.5” wheels, 170mm front and 160mm rear travel, and the utmost in adjustability. Riders can alter the head tube angle and bottom bracket/chainstay length, as well as run 29” rear wheels if desired. “Bear Box” downtube storage includes a zippered nylon bag to house trail essentials, and a 34.9mm seatpost increases strength and is compatible with the latest dropper posts.

The Alpine Trail XR frame kit gives the rider the chassis to create the Alpine Trail that best meets their needs. All the essentials are included, from the rear shock to the headset, the rear axle and seattube collar. You bring your creativity and components to create the raddest bike on the trail.

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Specifications

  • Frame

    All New Series 4 6061 Aluminum , 29” Wheels, 160mm Travel MultiTrac LT Suspension Platform, Integrated Downtube Storage, Adjustable Headset & CS Length/BB Height, Full Internal Cable Routing, Chainstay Mounted Post Mount Disc Brake, 148x12mm Boost Thru- Axle, 73mm Threaded BB w/ ISCG05 Tabs

  • Rear Suspension

    RockShox Super Deluxe Coil Ultimate, 205x65, 30xM8 Lower Hardware, Custom Tune, Spring Rates S/M: 350lbs, L/XL:450lbs

  • Headset

    FSA Custom, Adjustable HTA Design

  • Extras

    Marin MTB Seat Clamp, Bolt Type

  • Extras

    Bolt-On 12mm Thru-Axle, 174mm Length, 1.0 Thread Pitch, 16.5mm, Tapered Head

  • Extras

    Downtube Storage Bag

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

Geometry

With the integrated flip chips, adjustable headset and an aftermarket 29” rear wheel, 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. Finally, using our proprietary headset cups and inserts, the headtube angle can be adjusted to +0.75° or -0.75° from the standard 63° position, giving the rider three options.

Click away below to see what configuration works best for you.

Geometry configuration

  • Front/Rear Wheels: F: 29"/R: 27.5"
  • BB and Chainstay: High BB/Short CS
  • Headtube Angle: 0° Headset Cup
  • Front/Rear Wheels: F: 29"/R: 27.5"
  • BB and Chainstay: High BB/Short CS
  • Headtube Angle: -.75° Headset Cup
  • Front/Rear Wheels: F: 29"/R: 27.5"
  • BB and Chainstay: High BB/Short CS
  • Headtube Angle: +.75° Headset Cup
  • Front/Rear Wheels: F: 29"/R: 27.5"
  • BB and Chainstay: Low BB/Long CS
  • Headtube Angle: 0° Headset Cup
  • Front/Rear Wheels: F: 29"/R: 27.5"
  • BB and Chainstay: Low BB/Long CS
  • Headtube Angle: -.75° Headset Cup
  • Front/Rear Wheels: F: 29"/R: 27.5"
  • BB and Chainstay: Low BB/Long CS
  • Headtube Angle: +.75° Headset Cup
  • Front/Rear Wheels: F: 29"/R: 29"
  • BB and Chainstay: High BB/Short CS
  • Headtube Angle: +0° Headset Cup
  • Front/Rear Wheels: F: 29"/R: 29"
  • BB and Chainstay: High BB/Short CS
  • Headtube Angle: -.75° Headset Cup
  • Front/Rear Wheels: F: 29"/R: 29"
  • BB and Chainstay: High BB/Short CS
  • Headtube Angle: +.75° Headset Cup
  • Front/Rear Wheels: F: 29"/R: 29"
  • BB and Chainstay: Low BB/Long CS
  • Headtube Angle: +0° Headset Cup
  • Front/Rear Wheels: F: 29"/R: 29"
  • BB and Chainstay: Low BB/Long CS
  • Headtube Angle: -.75° Headset Cup
  • Front/Rear Wheels: F: 29"/R: 29"
  • BB and Chainstay: Low BB/Long CS
  • Headtube Angle: +.75° Headset Cup
F/R Wheels BB and Chainstay Headtube Angle Select
F: 29"/R: 27.5" High BB/Short CS 0° Headset Cup
F: 29"/R: 27.5" High BB/Short CS -.75° Headset Cup
F: 29"/R: 27.5" High BB/Short CS +.75° Headset Cup
F: 29"/R: 27.5" Low BB/Long CS 0° Headset Cup
F: 29"/R: 27.5" Low BB/Long CS -.75° Headset Cup
F: 29"/R: 27.5" Low BB/Long CS +.75° Headset Cup
F: 29"/R: 29" High BB/Short CS +0° Headset Cup
F: 29"/R: 29" High BB/Short CS -.75° Headset Cup
F: 29"/R: 29" High BB/Short CS +.75° Headset Cup
F: 29"/R: 29" Low BB/Long CS +0° Headset Cup
F: 29"/R: 29" Low BB/Long CS -.75° Headset Cup
F: 29"/R: 29" Low BB/Long CS +.75° Headset Cup
Alpine Trail XR Frame Kit geometry diagram
S M L XL
STACK 620.08 633.51 642.6 646.93
REACH 430 460 490 520
HEADTUBE ANGLE 63.5° 63.5° 63.5° 63.5°
HEADTUBE LENGTH 100 115 125 130
SEATTUBE ANGLE 79.2° 79° 78.8° 78.6°
SEATTUBE LENGTH 400 420 430 460
TOPTUBE EFFECTIVE 556 592 626 659
BB HEIGHT 352 352 352 352
BB DROP (REAR/FRONT) 7/24 7/24 7/24 7/24
CHAINSTAY 435 435 435 435
WHEELBASE 1211.42 1248.11 1282.57 1317.8
STANDOVER HEIGHT 683.32 68 9.88 695.6 698.13
FORK OFFSET 44 44 44 44
SEATPOST DIAMETER 34.9 34.9 34.9 34.9
HANDLEBAR WIDTH 780 780 780 780
STEM LENGTH 35 35 35 35
CRANK LENGTH 160 160 160 160
S M L XL
STACK 617.87 631.56 640.57 645.07
REACH 430.68 460.18 490.02 519.91
HEADTUBE ANGLE 62.7° 62.9° 62.9° 62.9°
HEADTUBE LENGTH 100 115 125 130
TOPTUBE EFFECTIVE 554.83 590.11 624.57 657.29
SEATTUBE ANGLE 79.4° 79.1° 78.9° 78.7°
SEATTUBE LENGTH 400 420 430 460
BB HEIGHT 351 351 351 351
BB DROP (REAR/FRONT) 9/26 9/26 9/26 9/26
CHAINSTAY 435 435 435 435
WHEELBASE 1220.38 1255.58 1289.48 1321.57
STANDOVER HEIGHT 682.07 688.93 695.05 697.42
FORK OFFSET 44 44 44 44
SEATPOST DIAMETER 34.9 34.9 34.9 34.9
HANDLEBAR WIDTH 780 780 780 780
STEM LENGTH 35 35 35 35
CRANK LENGTH 160 160 160 160
S M L XL
STACK 622.82 636.16 645.09 649.48
REACH 428.58 458.88 489 519.23
HEADTUBE ANGLE 64° 64° 64° 64°
HEADTUBE LENGTH 100 115 125 130
TOPTUBE EFFECTIVE 559 594.21 628.68 661.39
SEATTUBE ANGLE 79° 78.7° 78.5° 78.4°
SEATTUBE LENGTH 400 420 430 460
BB HEIGHT 354 354 354 354
BB DROP (REAR/FRONT) 5/22 5/22 5/22 5/22
CHAINSTAY 435 435 435 435
WHEELBASE 1203.81 1241.44 1276.18 1308.98
STANDOVER HEIGHT 685.12 691.43 696.5 699.36
FORK OFFSET 44 44 44 4
SEATPOST DIAMETER 34.9 34.9 34.9 34.9
HANDLEBAR WIDTH 780 780 780 780
STEM LENGTH 35 35 35 35
CRANK LENGTH 160 160 160 160
S M L XL
STACK 623.93 637.5 646.6 651.22
REACH 424.4 454.45 484.52 514.61
HEADTUBE ANGLE 63° 63° 63° 63°
HEADTUBE LENGTH 100 115 125 130
TOPTUBE EFFECTIVE 557.88 593.17 627.68 660.45
SEATTUBE ANGLE 78.7° 78.5° 78.3° 78.1°
SEATTUBE LENGTH 400 420 430 460
BB HEIGHT 345 345 345 345
BB DROP (REAR/FRONT) 14/31 14/31 14/31 14/31
CHAINSTAY 442 442 442 442
WHEELBASE 1218.15 1254.84 12898.3 1321.53
STANDOVER HEIGHT 676 682.56 687.27 690.58
FORK OFFSET 44 44 44 44
SEATPOST DIAMETER 34.9 34.9 34.9 34.9
HANDLEBAR WIDTH 780 780 780 780
STEM LENGTH 35 35 35 35
CRANK LENGTH 160 160 160 160
S M L XL
STACK 626.67 640.13 649.23 653.78
REACH 442.93 453.29 483.48 513.81
HEADTUBE ANGLE 62.2° 62.4° 62.4° 62.4°
HEADTUBE LENGTH 100 115 125 130
TOPTUBE EFFECTIVE 560.07 595.34 629.87 662.62
SEATTUBE ANGLE 78.5° 78.3° 78° 77.9°
SEATTUBE LENGTH 400 420 430 460
BB HEIGHT 347 347 347 346
BB DROP (REAR/FRONT) 12/29 12/29 13/30 13/30
CHAINSTAY 442 442 442 442
WHEELBASE 1210.58 1248.21 1282.95 1315.75
STANDOVER HEIGHT 678.11 684.29 688.37 691.73
FORK OFFSET 44 44 44 44
SEATPOST DIAMETER 34.9 34.9 34.9 34.9
HANDLEBAR WIDTH 780 780 780 780
STEM LENGTH 35 35 35 35
CRANK LENGTH 160 160 160 160
S M L XL
STACK 621.7 635.54 644.7 649.34
REACH 425.13 454.67 484.57 514.56
HEADTUBE ANGLE 63.6° 63.6° 63.6° 63.5°
HEADTUBE LENGTH 100 115 125 130
TOPTUBE EFFECTIVE 555.85 591.2 625.71 658.48
SEATTUBE ANGLE 78.9° 78.7° 78.4° 78.2°
SEATTUBE LENGTH 400 420 430 460
BB HEIGHT 343 344 344 344
BB DROP (REAR/FRONT) 16/33 15/32 15/32 15/32
CHAINSTAY 442 442 442 442
WHEELBASE 1227.07 1262.27 1296.19 1328.28
STANDOVER HEIGHT 674.52 681.33 686.32 689.41
FORK OFFSET 44 44 44 44
SEATPOST DIAMETER 34.9 34.9 34.9 34.9
HANDLEBAR WIDTH 780 780 780 780
STEM LENGTH 35 35 35 35
CRANK LENGTH 160 160 160 160
S M L XL
STACK 620.08 633.51 642.46 646.93
REACH 430 460 490 520
HEADTUBE ANGLE 63.5° 63.5° 63.5° 63.5°
HEADTUBE LENGTH 100 115 125 130
TOPTUBE EFFECTIVE 556.83 592.07 626.52 659.24
SEATTUBE ANGLE 78.4° 78.2° 78° 77.9°
SEATTUBE LENGTH 400 420 430 460
BB HEIGHT 352 352 352 352
BB DROP 24 24 24 24
CHAINSTAY 435 435 435 435
WHEELBASE 1212.66 1249.35 1283.82 1316.05
STANDOVER HEIGHT 683.32 689.88 695.6 698.13
FORK OFFSET 44 44 44 44
SEATPOST DIAMETER 34.9 34.9 34.9 34.9
HANDLEBAR WIDTH 780 780 780 780
STEM LENGTH 35 35 35 35
CRANK LENGTH 160 160 160 160
S M L XL
STACK 617.87 631.56 640.57 645.07
REACH 430.68 460.18 490.01 519.91
HEADTUBE ANGLE 63.6° 63.6° 63.6° 63.5°
HEADTUBE LENGTH 100 115 125 130
TOPTUBE EFFECTIVE 554.83 590.11 624.57 657.3
SEATTUBE ANGLE 78.6° 78.4° 78.1° 78°
SEATTUBE LENGTH 400 430 430 460
BB HEIGHT 350 351 351 351
BB DROP 26 25 25 25
CHAINSTAY 435 435 435 435
WHEELBASE 1221.56 1256.77 1290.68 1322.78
STANDOVER HEIGHT 682.06 688.93 695.05 697.42
FORK OFFSET 44 44 44 44
SEATPOST DIAMETER 34.9 34.9 34.9 34.9
HANDLEBAR WIDTH 780 780 780 780
STEM LENGTH 35 35 35 35
CRANK LENGTH 160 160 160 160
S M L XL
STACK 622.82 636.13 645.08 649.48
REACH 428.57 458.88 489 519.23
HEADTUBE ANGLE 62.7° 62.9° 62.9° 63°
HEADTUBE LENGTH 100 115 125 130
TOPTUBE EFFECTIVE 558.99 594.21 628.68 661.39
SEATTUBE ANGLE 78.1° 78° 77.8° 77.7°
SEATTUBE LENGTH 400 420 430 460
BB HEIGHT 354 354 354 354
BB DROP 22 22 22 22
CHAINSTAY 435 435 435 435
WHEELBASE 1205.12 1242.74 1277.49 1310.28
STANDOVER HEIGHT 685.12 691.46 696.6 699.37
FORK OFFSET 44 44 44 44
SEATPOST DIAMETER 34.9 34.9 34.9 34.9
HANDLEBAR WIDTH 780 780 780 780
STEM LENGTH 35 35 35 35
CRANK LENGTH 160 160 160 160
S M L XL
STACK 623.96 637.53 646.63 651.25
REACH 424.36 454.41 484.48 514.57
HEADTUBE ANGLE 63° 63° 63° 63°
HEADTUBE LENGTH 100 115 125 130
TOPTUBE EFFECTIVE 557.89 593.18 627.68 660.45
SEATTUBE ANGLE 77.9° 77.7° 77.5° 77.4°
SEATTUBE LENGTH 400 420 430 460
BB HEIGHT 345 345 345 345
BB DROP 31.2 31.2 31.2 31.2
CHAINSTAY 442 442 442 442
WHEELBASE 1219.07 1255.77 1290.23 1322.46
STANDOVER HEIGHT 676 682.56 687.27 690.58
FORK OFFSET 44 44 44 44
SEATPOST DIAMETER 34.9 34.9 34.9 34.9
HANDLEBAR WIDTH 780 780 780 780
STEM LENGTH 35 35 35 35
CRANK LENGTH 160 160 160 160
S M L XL
STACK 626.69 640.15 649.26 653.81
REACH 442.89 453.25 483.44 513.77
HEADTUBE ANGLE 62.2° 62.3° 62.4° 62.4°
HEADTUBE LENGTH 100 115 125 130
TOPTUBE EFFECTIVE 560.08 595.35 629.87 662.63
SEATTUBE ANGLE 77.7° 77.5° 77.3° 77.2°
SEATTUBE LENGTH 400 420 430 460
BB HEIGHT 347 347 347 346
BB DROP 29 29.3 29.5 29.8
CHAINSTAY 442 442 442 442
WHEELBASE 1211.58 1249.2 1283.94 1316.73
STANDOVER HEIGHT 678.06 684.24 688.31 691.68
FORK OFFSET 44 44 44 44
SEATPOST DIAMETER 34.9 34.9 34.9 34.9
HANDLEBAR WIDTH 780 780 780 780
STEM LENGTH 35 35 35 35
CRANK LENGTH 160 160 160 160
S M L XL
STACK 621.73 635.57 644.73 649.38
REACH 425.09 454.63 484.53 514.52
HEADTUBE ANGLE 62.2 62.3 62.4 62.4
HEADTUBE LENGTH 100 115 125 130
TOPTUBE EFFECTIVE 555.86 591.2 625.72 658.49
SEATTUBE ANGLE 78.1 77.9 77.7 77.5
SEATTUBE LENGTH 400 420 430 460
BB HEIGHT 343 343 343 343
BB DROP 32 32 32 32
CHAINSTAY 442 442 442 442
WHEELBASE 1227.94 1263.16 1297.07 1329.17
STANDOVER HEIGHT 674.47 681.27 686.26 689.36
FORK OFFSET 44 44 44 44
SEATPOST DIAMETER 34.9 34.9 34.9 34.9
HANDLEBAR WIDTH 780 780 780 780
CRANK LENGTH 160 160 160 160

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 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 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 SETUP

Recommended Sag = 30%/19.5mm

Step 1: Use your finger to slide the rubber bump stop (on the shock shaft) up to the seal head.

Step 2: Sit on the bike and put all of your weight on the bike. Do *not* cycle the suspension.

Step 3: Measure sag (from shock body to bumper), If it does not match the bike’s recommended sag in millimeters repeat process, and replace coil spring with appropriate rate.

Step 4: Adjust rebound setting to ensure proper control.

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 Super Deluxe Coil Ultimate

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

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