2017 Chumba Cycles URSA 29plus Backcountry Base
- Category
- Hardtail Cross-country MTB
- Design
- Flat Bar, Hardtail (Front suspension)
- Frame
- Steel
- Features
- Disc brake
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 | Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry |
Geometry
SM | MD | LG | XL | |
Stack | 595mm | 604mm | 615mm | 616mm |
Reach | 404mm | 426mm | 448mm | 454mm |
Stack to Reach Ratio | 1.47:1 | 1.42:1 | 1.37:1 | 1.36:1 |
Seat Tube Length, C-T | 381mm | 431.8mm | 482.6mm | 520.7mm |
Top Tube Length, Effective/Horizontal Center | 585mm | 610mm | 635mm | 645mm |
Top Tube Slope | 24.1deg | 19.1deg | 14.6deg | 11.1deg |
Head Tube Angle | 69deg | 69deg | 69deg | 69deg |
Seat Tube Angle | 72.5deg | 72.5deg | 72.5deg | 72.5deg |
Head Tube Length | 90mm | 100mm | 110mm | 115mm |
Bottom Bracket Drop | 56mm | 56mm | 56mm | 56mm |
Bottom Bracket Height | 331.2mm | 331.2mm | 331.2mm | 331.2mm |
Chainstay Length | 460mm | 460mm | 460mm | 460mm |
Chainstay Length Max | 460mm | 460mm | 460mm | 460mm |
Chainstay Length Horizontal | 456.6mm | 456.6mm | 456.6mm | 456.6mm |
Chainstay Length Horizontal Max | 456.6mm | 456.6mm | 456.6mm | 456.6mm |
Front-Center | 652.8mm | 678.7mm | 703.7mm | 717.6mm |
Front-Center Horizontal | 650.4mm | 676.4mm | 701.4mm | 715.4mm |
Wheelbase | 1107mm | 1133mm | 1158mm | 1172mm |
Wheelbase Max | 1107mm | 1133mm | 1158mm | 1172mm |
Fork Offset/Rake | 36.9mm | 37.4mm | 36.3mm | 43.4mm |
Fork Length (Axle-To-Crown) | 490mm | 490mm | 490mm | 490mm |
Trail | 109.1mm very high | 108.6mm very high | 109.8mm very high | 102.2mm very high |
Mechanical Trail | 101.9mm | 101.4mm | 102.5mm | 95.4mm |
Wheel Flop | 36.5mm | 36.3mm | 36.7mm | 34.2mm |
Standover Height | 736.6mm | 774.7mm | 805.2mm | 825.5mm |
Tire to Pedal Spindle | 95.6mm 170 mm cranks | 121.5mm 170 mm cranks | 146.5mm 170 mm cranks | 160.4mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 161.2mm 170 mm cranks | 161.2mm 170 mm cranks | 161.2mm 170 mm cranks | 161.2mm 170 mm cranks |
Base Build
SM | MD | LG | 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 |
Tire Width | 3in | 3in | 3in | 3in |
Tire Width Max | 3in | 3in | 3in | 3in |
Tire Outer Diameter | 774.4mm | 774.4mm | 774.4mm | 774.4mm |
Bike Length with Tires | 1881.4mm | 1907.4mm | 1932.4mm | 1946.4mm |
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 Cross-country MTBSource:Bike Counterculture Geometry Database