Masso 650B+ - Medium Demo Bike

Size Guide
Tommaso Size Chart


~This Masso is a return bike that has never been ridden and has a minor scratch on the downtube. We have taken $150 off so it comes Ready to Ride at only $789.94!~

If you are looking for control, performance, and value in your new mountain bike, the Masso is sure to please. With amazing features, such as a premium XLS crankset, 650b+ wheels, and the versatility to use 29er wheels, this bike performs great and is ultra versatile. We live in the Rocky Mountains and demand performance, fun, and durability from our mountain bikes. For this reason, we created our best and most durable MTB frame ever, which is covered by our incredible lifetime warranty.




The Tommaso 650B+ (27.5") Alloy MTB thru-axle frame is rack ready for all your bikepacking and commuting needs, while XCM thru-axle fork offers 100mm of travel to crush your local trails.



Once you ditch the front derailleur and go 1x, you don’t go back. With a huge cassette in the rear, the Masso offers 10 quick shifting speeds with a wide 11-42T range. The clutch rear derailleur also keeps the chain tight to avoid bouncing during your descent. After you try this drivetrain, you’ll wonder why you ever used a front derailleur on a mountain bike!



Power and speed is nothing without control. This is exactly why we equipped the Masso with Shimano Hydraulic disc brakes, for precision control and excellent stopping power. These powerful brakes allows you to ride with confidence, knowing that you have quick stopping power to descend even the steepest mountain.




Tommaso 650B+" Alloy MTB Frame (Thru-Axle)

SR Suntour SF15-XCM 29" Fork with 100mm Travel & Thru-Axle

Shimano Deore M6000 SGS (Shadow Plus w/ Clutch) Rear Derailleur

Shimano Deore Shifters

Shimano SLX M7000 32T Crankset

Shimano Deore 11-42T cassette

Shimano M315 Hydraulic Disc







Frame Tommaso 650B+ Aluminum MTB Frame (Thru-Axle)
Fork SR Suntour XCM 650B+ with 100mm Travel (Thru-Axle)
Sizes S, M, L, XL
Headset Tommaso Integrated


Shifters Shimano Deore M6000
Front Derailleur N/A
Rear Derailleur Shimano Deore M6000 SGS (Shadow Plus w/ Clutch)
Cassette Shimano Deore HG500 11-42
Speeds 1x10 (10 Total Speeds)
Crankset Shimano SLX M7000 32T
Crank Arm Length 170mm (S Frame) / 175mm (M, L, XL Frames)
Chain KMC X10 (10spd Chain)
Bottom Bracket Shimano SM-BB52


Brakes Shimano M315 Hydraulic Disc


Wheelset Mingda DK 27.5" (650B) 32 Spoke
Tires Seyoun B063 650B+ 3"
Tubes 650B - 3"


Handlebar Zoom 320BTFOV Alloy 720mm (Small) / 750mm (M,L, XL)
Stem: Zoom D507A 70mm (S), 80mm (M), 90mm (L), 100mm (XL)
Saddle Tommaso Velo Steel Rails
Seatpost Tommaso Aluminum (31.6mm)
Pedals Alloy Flat





  Frame Size S M L XL
  Recommended Height 5'5" - 5'8" 5'9" - 5'11" 6' - 6'2" 6'2" - 6'5"
A Seat Tube (mm) 381 432 483 533
C Top Tube (mm) - Effective 565 585 608 620
H Chainstay (mm) 455 455 455 455
I Wheelbase (mm) 1103.5 1123.7 1145.3 1162
G Fork Offset (mm) 42 42 42 42
E Head Tube Angle (deg) 68 68 68 68
D Seat Tube Angle (deg) 71 71 71 71
F Head Tube (mm) 100 110 120 130
  Standover Height (mm) 745 762 795 825
  Stem (mm) 70 80 90 100
  Reach (mm) 401.3 409.1 415.5 427.6


Tommaso Size Chart
Size Chart Coming Soon. Please refer to the size chart at the bottom of the page.