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Our popular Mason mountain bike line is comfortable at the front of the pack. An established leader in the slack big-wheel hardtail category, it made sense to continue to push the limits with the emergence of 27.5 Plus and Boost technology. In a nutshell, this new configuration means significant gains in traction and wheel stiffness, with very little loss from its 29" wheel. If you've ridden a previous incarnation of the Mason, this may be hard to believe. But it's true. We made sure to keep the ride characteristics as similar as we could: the butted/formed aluminum frame is low-slung and slack, with a 120mm fork. The ride has stayed distinctly all-mountain, especially with the increase in traction from running this wide of a tire. Avid hydraulic brakes, a wide-range 2×10 drivetrain, and wide bars indicate that the Mason is ready to lead the way again.

Frame Mason 27.5" Plus 6061-T6 Weapons Grade Aluminum w/Formed Top Tube, Butted / Formed Down Tube / Seatstays, Tapered Head Tube, ISCG, 148x12mm Boost Spec Dropouts
Fork Rockshox Reba 27.5+, 120mm, Air, external rebound adj. w/turnkey lockout, Magnesium Lowers, Alloy 1.5 Tapered Steerer Tube
Cranks Shimano M627 double crankset
Bottom Bracket Outboard Bearing
Front Derailleur SRAM X5 High Direct Mount
Rear Derailleur SRAM X7 Type 2.1
Shifter SRAM X5 10spd
Cogset Shimano HG50 10spd (11-36t)
Chain SRAM PC-1031 Power Link - Gold
Front Hub Alloy Disc 32h Boost 110x15mm Thru Axle, Sealed Cartridge Bearing
Rear Hub Alloy Disc 32h Boost 148x12mm Thru Axle, 4 Sealed Cartridge Bearing
Spokes 14g Stainless Steel
Rims DB OffPiste32 Doublewall Disc, 32h Tubless Compatible
Tires WTB Trail Blazer, 27.5"x2.8, 27 TPI
Brakes Avid DB1 Hydraulic Disc, 180mm/180mm Centerline Rotors
Brake Levers Avid DB1 Hydraulic Levers w/ Tooled Reach Adj.
Pedals DB Alloy w/ molded traction pins
Handlebar DB35, 760mm width, 15mm rise, 35mm barbore
Grips DB4L "Lock on" 135mm Kraton
Stem DB35, 60mm length, 35mm barbore
Seat DB Race M-series saddle
Seatpost DB Micro Adjust 30.9mm
Extras Owner's Manual
Bike Weight 30 lb 7 oz (size medium no pedals)
Accessories Mason 27.5" Plus 6061-T6 Weapons Grade Aluminum w/Formed Top Tube, Butted / Formed Down Tube / Seatstays, Tapered Head Tube, ISCG, 148x12mm Boost Spec Dropouts
Bike Size S/15.5" / Rider Height: 5'4" - 5'7" M/17" / Rider Height: 5'7" - 5'10" L/19" / Rider Height: 5'10" - 6'1" XL/21" / Rider Height: 6'1" - 6'4"
Seat Tube Length 394mm 432mm 483mm 533mm
Stand Over Height 775mm 787mm 800mm 831mm
Top Tube Length 572mm 602mm 620mm 643mm
Head Tube Length 110mm 110mm 110mm 110mm
Head Angle 66.5° 66.5° 66.5° 66.5°
Seat Angle 73° 73° 73° 73°
Wheel Base 1089mm 1108mm 1127mm 1145mm
Chain Stay Length 440mm 440mm 440mm 440mm
Fork Offset 40mm 40mm 40mm 40mm
BB Drop
Stem Length 45mm 45mm 60mm 60mm
Handlebar Width 740mm 740mm 740mm 740mm
Crank Length 170mm 175mm 175mm 175mm
Seat Post Length 350mm 350mm 350mm 350mm

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