2025 Radical Bicycle Co. Grim Ripper 29
- Category
- Hardtail Trail MTB
- Design
- Flat Bar, Hardtail (Front suspension)
- Frame
- Steel
- Suspension
- 130mm fork travel, 0% sag
- Features
- Disc brake, Single-speed capable
Geometry
Regular | Large | Long | |
Stack | 640mm | 649mm | 658mm |
Reach | 460mm | 480mm | 500mm |
Stack to Reach Ratio | 1.39:1 | 1.35:1 | 1.32:1 |
Seat Tube Length, C-T | 400mm | — | 420mm |
Seat Tube Length, Unknown | — | 410mm | — |
Top Tube Length, Effective/Horizontal HT Top | 607mm | — | 651mm |
Top Tube Length, Effective/Horizontal Unknown | — | 649mm | — |
Top Tube Slope | 24.5deg | 23.6deg | 22.8deg |
Head Tube Angle | 64deg | 64deg | 64deg |
Seat Tube Angle | 77.5deg | 77.5deg | 77.5deg |
Head Tube Length | 120mm | 130mm | 140mm |
Bottom Bracket Drop | 55mm | 55mm | 55mm |
Bottom Bracket Height | 317mm | 258.4mm | 317mm |
Chainstay Length | 425mm | 440mm | 425mm |
Chainstay Length Max | 440mm | — | 440mm |
Chainstay Length Horizontal | 421.4mm | 436.6mm | 421.4mm |
Chainstay Length Horizontal Max | 436.6mm | — | 436.6mm |
Front-Center | 798.5mm | 822.3mm | 847.4mm |
Front-Center Horizontal | 796.6mm | 820.5mm | 845.6mm |
Wheelbase | 1218mm | 1257mm | 1267mm |
Wheelbase Max | 1233mm | — | 1282mm |
Fork Offset/Rake | 46mm | 45.6mm | 46mm |
Fork Length, Unknown | 543mm | 120mm | 543mm |
Trail | 130.2mm very high | 102.1mm very high | 130.2mm very high |
Mechanical Trail | 117.1mm | 91.8mm | 117.1mm |
Wheel Flop | 51.3mm | 40.2mm | 51.3mm |
Tire to Pedal Spindle | 256.5mm 170 mm cranks | 338.9mm 170 mm cranks | 305.4mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 147mm 170 mm cranks | 88.4mm 170 mm cranks | 147mm 170 mm cranks |
29 Build
Regular | Large | Long | |
Wheel Size | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD |
Tire Width | 2.4in | 2.4mm | 2.4in |
Tire Width Max | 2.5in | — | 2.5in |
Tire Outer Diameter | 743.9mm | 626.8mm | 743.9mm |
Bike Length with Tires | 1961.9mm | 1883.8mm | 2010.9mm |
Published Sizing Recommendations
Height | 5 ft 5.5 in to 5 ft 11.5 in | — | 5 ft 11.5 in to 6 ft 5 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 Trail MTBSource:https://cdn.shopify.com/s/files/1/0448/4762/8451/files/Grim_Ripper_MK2_Steel_Geo_Chart_2179cd32-bfdf-4b6d-8107-7d6e352de1d1.png?v=1741366878, https://radicalbicycleco.com/products/grim-ripper-1