2025 Gravity Zilla AL PRO
- Category
- All-road/Gravel
- Design
- Drop Bar, Rigid, non-suspension corrected
- Frame
- Aluminum
- Fork
- Carbon/Composite
- Features
- Disc brake
Geometry
46cm | 49cm | 52cm | 54cm | 56cm | 58cm | 61cm | |
Stack | 550mm | 561.4mm | 577.5mm | 593.6mm | 614.6mm | 633.6mm | 654.7mm |
Reach | 371.4mm | 374.3mm | 378.8mm | 382.5mm | 381.9mm | 376.8mm | 383.7mm |
Stack to Reach Ratio | 1.48:1 | 1.5:1 | 1.52:1 | 1.55:1 | 1.61:1 | 1.68:1 | 1.71:1 |
Seat Tube Length, C-T | 460mm | 490mm | 520mm | 540mm | 560mm | 580mm | 610mm |
Top Tube Length, Effective/Horizontal Center | 526mm | 530mm | 545mm | 555mm | 570mm | 575mm | 590mm |
Head Tube Angle | 70deg | 70.5deg | 71deg | 71.5deg | 72deg | 72deg | 72.5deg |
Seat Tube Angle | 74.5deg | 74.5deg | 74deg | 73.5deg | 73deg | 73deg | 72.5deg |
Head Tube Length | 110mm | 120mm | 135mm | 150mm | 170mm | 190mm | 210mm |
Bottom Bracket Drop | 65mm | 65mm | 65mm | 65mm | 65mm | 65mm | 65mm |
Bottom Bracket Height | 296mm | 296mm | 296mm | 296mm | 296mm | 296mm | 296mm |
Chainstay Length | 440mm | 440mm | 440mm | 440mm | 440mm | 440mm | 440mm |
Chainstay Length Horizontal | 435.2mm | 435.2mm | 435.2mm | 435.2mm | 435.2mm | 435.2mm | 435.2mm |
Front-Center | 599.4mm | 601.4mm | 606.3mm | 610.3mm | 611.3mm | 612.3mm | 620.2mm |
Front-Center Horizontal | 595.8mm | 597.8mm | 602.8mm | 606.8mm | 607.8mm | 608.8mm | 616.8mm |
Wheelbase | 1031mm | 1033mm | 1038mm | 1042mm | 1043mm | 1044mm | 1052mm |
Fork Offset/Rake | 45mm | 45mm | 45mm | 45mm | 45mm | 45mm | 45mm |
Fork Length, Unknown | 405mm | 405mm | 405mm | 405mm | 405mm | 405mm | 405mm |
Trail | 83.5mm very high | 80.1mm very high | 76.7mm high | 73.3mm high | 70mm high | 70mm high | 66.6mm high |
Mechanical Trail | 78.5mm | 75.5mm | 72.5mm | 69.6mm | 66.6mm | 66.6mm | 63.6mm |
Wheel Flop | 26.8mm | 25.2mm | 23.6mm | 22.1mm | 20.6mm | 20.6mm | 19.1mm |
Standover Height | 727.7mm | 760.7mm | 782.1mm | 801.9mm | 821.9mm | 842mm | 868.7mm |
Tire to Pedal Spindle | 68.4mm 170 mm cranks | 70.4mm 170 mm cranks | 72.8mm 172.5 mm cranks | 76.8mm 172.5 mm cranks | 75.3mm 175 mm cranks | 76.3mm 175 mm cranks | 84.2mm 175 mm cranks |
Pedal Spindle to Ground Clearance | 126mm 170 mm cranks | 126mm 170 mm cranks | 123.5mm 172.5 mm cranks | 123.5mm 172.5 mm cranks | 121mm 175 mm cranks | 121mm 175 mm cranks | 121mm 175 mm cranks |
AL PRO Build
46cm | 49cm | 52cm | 54cm | 56cm | 58cm | 61cm | |
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 | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD |
Tire Width | 50mm | 50mm | 50mm | 50mm | 50mm | 50mm | 50mm |
Tire Outer Diameter | 722mm | 722mm | 722mm | 722mm | 722mm | 722mm | 722mm |
Bike Length with Tires | 1753mm | 1755mm | 1760mm | 1764mm | 1765mm | 1766mm | 1774mm |
Crank Length | 170mm | 170mm | 172.5mm | 172.5mm | 175mm | 175mm | 175mm |
Handlebar Width | 400mm | 400mm | 420mm | 420mm | 440mm | 440mm | 440mm |
Stem Length | 70mm | 70mm | 80mm | 80mm | 90mm | 90mm | 90mm |
Stem Angle | -6deg | -6deg | -6deg | -6deg | -6deg | -6deg | -6deg |
Published Sizing Recommendations
Height | 5 ft 0 in to 5 ft 3 in | 5 ft 3 in to 5 ft 5 in | 5 ft 6 in to 5 ft 8 in | 5 ft 8 in to 5 ft 10 in | 5 ft 10 in to 6 ft 0 in | 6 ft 0 in to 6 ft 2 in | 6 ft 2 in to 6 ft 4 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
All-road/GravelSource:https://www.bikesdirect.com/products/gravity/bike-packing-bikes/zilla-al-pro-bikepacking-gravel-bikes-adventure-road.htm