Diamondback Mason Trail 27.5+ Bike - 2017
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Diamondback expanded their popular Mason line to offer a hardtail with Plus-tire fun and capabilities. The beefy Mason Trail shares geometry, ride feel, versatility and that adventurous vibe for less.
Shop similar productsKey Details
- With 27.5x3.5 tires mounted on wide Blanchard rims, this bike is so adept at devouring choppy and loose trails that you may wonder why anyone needs rear suspension at all
- Wide-range 1x10 drivetrain makes short work of technical climbs, and the unbelievable plus-tire traction breathes new life into the trails you thought you'd mastered.
- 6061-T6 aluminum frame with 148x12 Boost dropouts
- SR Suntour Radion 27.5" Plus suspension fork delivers 120mm of travel; air-sprung
- SRAM NX X-Sync chainring, 30T
- Tektro Auriga Hydraulic Disc brakes, with 180mm rotor up front and 160mm rotor at back, deliver reliable stopping power
- Shimano Deore M615 Shadow Plus derailleur offers smooth shifting
- NOTE: Specs and images are subject to change based on component availability
- 1 year of free adjustments (see more below)
- In-store bike assembly
- Pickup in store or curbside
- Bike experts available at 170+ bike shops
- 20% off shop services
- Free tubes with purchase of flat tire repair (Co-op Cycles brand tubes only; tube must be installed at time of purchase)
New bikes go through a normal break-in period, after which they should be readjusted. All bicycles sold at REI include free adjustments for one year after purchase date—as many times as you need. Included: derailleur and brake adjustments, lateral wheel truing, hub and headset bearing adjustments, tire inflation and chain lubrication. Not included: replacement or installation of new components or accessories, any other services. Call your local REI Co-op Bike Shop for more information.
| Best Use | Mountain Biking |
|---|---|
| Mountain Bike Style | Trail |
| Frame | 6061-T6 aluminum |
| Bike Suspension | Front Suspension |
| Fork | SR Suntour Radion 27.5" Plus with 15mm thru-axle; air spring |
| Fork Travel | 120 millimeters |
| Crankset | SRAM NX 1x, with X-Sync 30t chainring |
| Bottom Bracket | SRAM GXP |
| Shifters | Shimano Deore M610, 10-speed |
| Rear Derailleur | Shimano Deore M615 Shadow Plus, 10-speed |
| Rear Cogs | Shimano Deore M610, 10-speed |
| Number of Gears | 10 |
| Brake Type | Hydraulic Disc Brake |
| Brakes | Tektro Auriga hydraulic disc, 180mm front / 160mm rear rotors |
| Brake Levers | Tektro Auriga hydraulic disc brake levers |
| Rims | Diamondback Blanchard 38, tubeless compatible, 32h |
| Front Hub | 32h Alloy, Boost 110x15mm thru-axle, sealed cartridge bearing; CNC disc mount |
| Rear Hub | 32h Alloy, Boost 148x12mm thru-axle, 2 sealed cartridge bearing, cassette |
| Wheel Size | 27.5+ inches |
| Tires | Chaoyang Big Daddy 27.5x3.5" |
| Tire Width | 3.5 inches |
| Handlebar Shape | Riser Bar |
| Handlebar | DB35 Alloy, 760mm wide, 15mm rise, 35mm bar bore |
| Stem | DB35 Alloy, 60mm, 35mm bar bore |
| Seat Post | DB Alloy micro-adjust 30.9mm |
| Saddle | DB Race M-Series saddle |
| Pedals | DB4L Alloy with molded traction pins |
| Headset | FSA NO.57, sealed cartridge for tapered head tube |
| Chain | KMC X10, 10-speed |
| Weight | 29 lbs. 2 oz. |
| Bike Weight | Bike weight is based on median size, as sold, or the average of two median sizes. |
| Gender | Unisex |
| S | M | L | XL | |
|---|---|---|---|---|
| Height Range | 5'4" - 5'7" | 5'7" - 5'10" | 5'10" - 6'3" | 6'3" - 6'6" |
| Reach | 400 | 418 | 435 | 455 |
| Stack | 604 | 604 | 604 | 604 |
| Effective Top Tube | 570 | 585 | 614 | 640 |
| Seat Tube Center-Top | 395 | 420 | 470 | 520 |
| Standover Height | 754 | 758 | 777 | 798 |
| Head Tube Length | 110 | 110 | 110 | 110 |
| Head Tube Angle (degrees) | 68 | 68 | 68 | 68 |
| Seat Tube Angle (degrees) | 73 | 73 | 73 | 73 |
| Bottom Bracket Height | 330 | 330 | 330 | 330 |
| Wheelbase | 1089 | 1131 | 1149 | 1168 |
| Chainstay | 440 | 440 | 440 | 440 |
| Fork Offset | 51 | 51 | 51 | 51 |
Sizing Notes
Bike measurements are stated in millimeters.
How we measure bikes
- Standover Height Standover Height is a measurement from the ground to the top of the top tube, measured at the midpoint of the top tube.
- Reach Reach is the horizontal distance from the center of the cranks to the center of the head tube, measured at head tube level.
- Stack Stack is the vertical distance from the center of the cranks to the center of the head tube, measured to the top of the head tube.
- Effective Top Tube Effective top tube is the distance from the center of the head tube to the center of the seat tube/seat post, measured parallel to the ground.
- Seat Tube Center to Top Seat Tube length is the measurement of the seat tube, from the center of the cranks to the top of the seat tube.
- Head Tube Length Head Tube Length is measured from the bottom to the top of the head tube.
- Head Tube Angle Head Tube Angle is the acute angle between the head tube and the ground (measured towards the rear of the bike)
- Seat Tube Angle Seat Tube Angle is the acute angle between the seat tube and the ground (measured towards the rear of the bike).
- Bottom Bracket Height Bottom Bracket Height is a measurement taken vertically from the ground up to the center of the cranks.
- Wheelbase Wheelbase is the measurement from the center of the front axle to the center of the rear axle.
- Chainstay Length Chainstay Length is the measurement from the center of the cranks to the center of the rear axle.
- Fork Offset Fork Offset, or rake, is the distance from the front axle to a line drawn parallel to the center of the head tube or steering axis.
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Great power transfer
I bought this bike after trying the co-op drt1.1, which is also a good bike, just not for me. A bit about me: I'm kinda huge at 300 lbs 6'1" The wheels/tires on this bike have so much grip that I don't just spin the rear tire. Some people say that it takes more effort to get going on a plus bike, but if your my size that's not the case. Also, I was worried about the 1x and not having a giant granny gear for the climbs. Well, I'm actually faster now. I think this is due to the grip which as I mentioned, allows me to put all my power down without wasting it and slipping the tire. The frame also seems very sturdy and the through axles are great for someone my size. Overall I love this bike. The only bad thing is, it specs a GXP BB but mine came with an internal type.
Stop Looking and Buy This Bike
I've owned this bike for about 2 months now and have taken it on (basically) every single track Kansas has to offer. While we are not Colorado, there are more than enough rocky sections and sharp climbs to go around. I transitioned from a full suspension Diamondback Recoil Comp and do not find myself missing the rear shock as these plus size tires prefer rough ground. The only upgrade I've done to this bike is add a Highline Dropper Post from Crank Brothers. This bike is not only great for the trails, but adventure biking as well. Kansas is known for our expansive gravel roads and bike packing. Although not as efficient as my gravel bike, I prefer the comfort and all out fun this bike has to offer. It's the most solid feeling bike in my arsenal and has replaced my other hardtail that is non plus size. The only downside to this bike is the frame geometry doesn't allow for a decent sized frame bag, but I'm just being picky at that point!