2021 Chromag Bikes Rootdown Base
- Category
- Hardtail All-mountain/Enduro MTB
- Design
- Flat Bar, Hardtail (Front suspension)
- Frame
- Steel
- Suspension
- 160mm fork travel
- Features
- Disc brake
Somewhat upright stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Average stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Average stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Average stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Average stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry |
Geometry
S | M | M/L | L | XL | |
Stack | 630mm | 630mm | 639mm | 648mm | 657mm |
Reach | 421mm | 446mm | 463mm | 487mm | 503mm |
Stack to Reach Ratio | 1.5:1 | 1.41:1 | 1.38:1 | 1.33:1 | 1.31:1 |
Seat Tube Length, C-T | 368mm | 406mm | 431mm | 456mm | 494mm |
Top Tube Length, Effective/Horizontal HT Top | 578mm | 603mm | 622mm | 648mm | 667mm |
Top Tube Slope | 28.2deg | 23.5deg | 21.3deg | 19deg | 15.9deg |
Head Tube Angle | 64deg | 64deg | 64deg | 64deg | 64deg |
Seat Tube Angle | 76deg | 76deg | 76deg | 76deg | 76deg |
Head Tube Length | 95mm | 95mm | 105mm | 115mm | 125mm |
Bottom Bracket Drop | 50.8mm | 50.8mm | 50.8mm | 50.8mm | 50.8mm |
Bottom Bracket Height | 323.7mm | 323.7mm | 323.7mm | 323.7mm | 323.7mm |
Chainstay Length | 420mm | 420mm | 420mm | 420mm | 420mm |
Chainstay Length Horizontal | 416.9mm | 416.9mm | 416.9mm | 416.9mm | 416.9mm |
Front-Center | 761.8mm | 786.7mm | 807.7mm | 835.6mm | 856.6mm |
Front-Center Horizontal | 760.1mm | 785.1mm | 806.1mm | 834.1mm | 855.1mm |
Wheelbase | 1177mm | 1202mm | 1223mm | 1251mm | 1272mm |
Fork Offset/Rake | 50.9mm | 50.9mm | 50.5mm | 50.2mm | 50.7mm |
Trail | 126.1mm very high | 126.1mm very high | 126.5mm very high | 126.9mm very high | 126.2mm very high |
Mechanical Trail | 113.3mm | 113.3mm | 113.7mm | 114mm | 113.5mm |
Wheel Flop | 49.7mm | 49.7mm | 49.8mm | 50mm | 49.7mm |
Standover Height | 677mm | 714mm | 738mm | 762mm | 799mm |
Tire to Pedal Spindle | 217.3mm 170 mm cranks | 242.2mm 170 mm cranks | 263.2mm 170 mm cranks | 291.1mm 170 mm cranks | 312.1mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 153.7mm 170 mm cranks | 153.7mm 170 mm cranks | 153.7mm 170 mm cranks | 153.7mm 170 mm cranks | 153.7mm 170 mm cranks |
Base Build
S | M | M/L | L | XL | |
Wheel Size | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD |
Tire Width | 2.5in | 2.5in | 2.5in | 2.5in | 2.5in |
Tire Width Max | 2.6in | 2.6in | 2.6in | 2.6in | 2.6in |
Tire Outer Diameter | 749mm | 749mm | 749mm | 749mm | 749mm |
Bike Length with Tires | 1926mm | 1951mm | 1972mm | 2000mm | 2021mm |
Crank Length | 170mm | 170mm | 170mm | 170mm | 170mm |
Published Sizing Recommendations
Height | 5 ft 1 in to 5 ft 5 in | 5 ft 4 in to 5 ft 8 in | 5 ft 7 in to 6 ft 0 in | 5 ft 11 in to 6 ft 3 in | 6 ft 2 in to 6 ft 6 in |
Stack and Reach vs. Category Trend
Very Upright
Somewhat Upright
Average
Somewhat Aggressive
Very Aggressive
The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.
Learn more about the Upright/Aggressive ScaleCategory Trend
Hardtail All-mountain/Enduro MTBSource:https://us.chromagbikes.com/products/rootdown-21