Marin Alpine Trail XR 2025 Frameset

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.

Specification

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, 148×12mm Boost Thru- Axle, 73mm Threaded BB w/ ISCG05 Tabs
Rear Shock	RockShox Super Deluxe Coil Ultimate, 205×65, 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 are subject to change without notice

Size Guide

Frame Size	Minimum Height	Maximum Height
Small	160cm (5’3”)	168cm (5’6”)
Medium	168cm (5’6”)	178cm (5’10”)
Large	178cm (5’10”)	188cm (6’2”)
X Large	188cm (6’2”)	195cm (6’5”)

We have developed our size guide from our selling experience and it may differ from the manufacturers guide. Please note, this is only a guide and if you have any concerns over sizing please get in contact

Geometry

Geometry configuration – 29/27.5 wheels – BB High – Chainstay Short – Headtube 0°

Frame Size	S	M	L	XL
A – Stack	620.08	633.51	642.6	646.93
B – Reach	430	460	490	520
C – Headtube Angle	63.5°	63.5°	63.5°	63.5°
D – Headtube Length	100	115	125	130
E – Seattube Angle	79.2°	79°	78.8°	78.6°
F – Seattube Length	400	420	430	460
G – Toptube Effective	556	592	626	659
H – BB Height	352	352	352	352
I – BB Drop (Rear/Front)	7/24	7/24	7/24	7/24
J – Chainstay	435	435	435	435
K – Wheelbase	1211.42	1248.11	1282.57	1317.8
L – Standover Height	683.32	68 9.88	695.6	698.13
M – 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

Want to compare the size of your current bike to this one? Read our Reach and Stack guide here.