Stevens Tonga 2025
2025 Mountain
Estimate price |
871$
Weight | 14.3 kg 
Bike details
Overview
Key information split into simple groups.
Bike summary
-
Category -
Frame Aluminum -
Travel Front 100mm -
Fork Suntour XCM
-
Groupset Altus, Acera -
Suspension Hardtail -
Drivetrain 2 × 9 -
Brakes Tektro Hydraulic Disc
Parts list
Components
Main components, grouped by system.
Bike components
Frame
Frame
Aluminium 6061, O.L.D.: 135 mm, Brake: IS disc, BB: BSA 73 mm, Front derailleur mount: clamp, Cable routing: external, Rack mounts
Suspension Fork
SR Suntour XCM DS, Travel: 100 mm, Coil spring, Steerer 1 1/8", O.L.D.: 100 mm, Brake: postmount disc 6"
Drivetrain
Rear Derailleur
Sunrace RDM91, 8/9-speed, Total capacity: 40 T
Front Derailleur
Shimano Altus, FD-M2020-TS, 2-speed
Shift Levers
Shimano Acera, SL-M3010, 2-speed
Cassette
SunRace CSM98, 9-speed, Combination: 11-13-15-18-21-24-28-32-36 T
Crank
27.5": Shimano FC-MT210-2 | 29": Oxygen Scorpo, 36-22 T, BB type: BSA 73 mm / 2-Piece
Bottom Bracket
BSA, 73mm, threaded
Chain
Shimano CN-HG53
Pedals
ATB Pro Reflex
Wheels
Front Hub
Shimano HB-TX505, Axle: QR9x100 mm
Rear Hub
Shimano FH-TX505-8, Axle: QR10x135 mm
Rims
Oxygen RM-M19, ETRTO: 19 x 584
Tires
Schwalbe Smart Sam Active-Line, Tire size: 27.5": 57-584 | 29": 57-622, SBC compound, KevlarGuard
Brakes
Brakes
Tektro HD-T275, Hydraulic disc brake
Brake Levers
Tektro HD-T275, 3 finger
Cockpit
Stem
Oxygen Driver, Handlebar clamp: 31.8 mm, Angle: 6°
Handlebar
Oxygen Driver, Width: 740 mm, Backsweep: 9°, Rise: 25 mm, Clamp: 31.8 mm
Headset
STEVENS MTB 1 1/8", Upper bearing cup: ZS44/28.6, Lower bearing cup: ZS44/30
Seat
Saddle
Oxygen Raceline
Seatpost
Oxygen Driver, Length: 350 mm, Diameter: 27.2 mm, Insertion depth: min. 100 mm
Fit data
Geometry
Numbers for sizing and ride feel.
| Size | 14" | 16" | 18" | 20" | 22" |
|---|---|---|---|---|---|
| Stack Reach Ratio | 1.449 mm | 1.374 mm | 1.465 mm | 1.431 mm | 1.408 mm |
| Bottom Bracket Height | 301 mm | 301 mm | 301 mm | 301 mm | 301 mm |
| Front Center | 627 mm | 653 mm | 663 mm | 684 mm | 705 mm |
| Rake | 42 mm | 42 mm | 46 mm | 46 mm | 46 mm |
| Trail | 91 mm | 91 mm | 80 mm | 80 mm | 82 mm |
| Stack | 558 mm | 562 mm | 608 mm | 618 mm | 632 mm |
| Reach | 385 mm | 409 mm | 415 mm | 432 mm | 449 mm |
| Top Tube Length | 540 mm | 565 mm | 595 mm | 615 mm | 635 mm |
| Seat Tube Angle | 74.5 ° | 74.5 ° | 73.5 ° | 73.5 ° | 73.5 ° |
| Seat Tube Length | 325 mm | 374 mm | 402 mm | 453 mm | 503 mm |
| Head Tube Angle | 69 ° | 69 ° | 70 ° | 70 ° | 70 ° |
| Head Tube Length | 90 mm | 95 mm | 100 mm | 110 mm | 125 mm |
| Chainstay Length | 435 mm | 435 mm | 450 mm | 450 mm | 450 mm |
| Wheelbase | 1057 mm | 1083 mm | 1104 mm | 1125 mm | 1146 mm |
| Bottom Bracket Drop | 50 mm | 50 mm | 70 mm | 70 mm | 70 mm |
| Standover Height | 705 mm | 735 mm | 770 mm | 803 mm | 838 mm |
| Wheels | 27" | 27" | 27" | 27" | 27" |