2025 Mason Cycles Exposure Base
- Category
- All-road/Gravel
- Design
- Drop Bar, Rigid, non-suspension corrected
- Frame
- Steel
- Fork
- Carbon/Composite
- Features
- Disc brake
Average stack and reachvs category | Somewhat upright stack and reachvs category | Somewhat upright stack and reachvs category | Somewhat upright stack and reachvs category | Somewhat upright stack and reachvs category | Average stack and reachvs category | Average stack and reachvs category | Average stack and reachvs category |
Geometry
48CM | 50CM | 52CM | 54CM | 56CM | 58CM | 60CM | 62CM | |
Stack | 536.1mm | 550.2mm | 566.2mm | 578.3mm | 589.8mm | 604mm | 627.7mm | 644mm |
Reach | 359.9mm | 360mm | 370.6mm | 375mm | 379.9mm | 392.9mm | 395.9mm | 403.6mm |
Stack to Reach Ratio | 1.49:1 | 1.53:1 | 1.53:1 | 1.54:1 | 1.55:1 | 1.54:1 | 1.59:1 | 1.6:1 |
Seat Tube Length, C-T | 480mm | 500mm | 520mm | 540mm | 560mm | 580mm | 600mm | 620mm |
Seat Tube Length, C-C | 432.3mm | 452.5mm | 472.7mm | 493.5mm | 513.4mm | 533.7mm | 553.6mm | 573.9mm |
Top Tube Length, Effective/Horizontal Center | 515.9mm | 520mm | 535mm | 553.3mm | 561.5mm | 584.2mm | 594.6mm | 607.3mm |
Top Tube Length, Actual C-C | 497.8mm | 502.4mm | 517.6mm | 534.9mm | 544mm | 566.8mm | 576.2mm | 589.3mm |
Top Tube Slope | 11deg | 10.2deg | 9.5deg | 8.6deg | 7.8deg | 6.9deg | 7.3deg | 6.9deg |
Head Tube Angle | 69.5deg | 69.5deg | 70deg | 70deg | 70.5deg | 71deg | 71deg | 71.5deg |
Seat Tube Angle | 74deg | 74deg | 74deg | 73deg | 73deg | 72.5deg | 72.5deg | 72.5deg |
Head Tube Length | 100mm | 115mm | 130mm | 145mm | 155mm | 170mm | 195mm | 210mm |
Bottom Bracket Drop | 77mm | 77mm | 77mm | 75mm | 75mm | 73mm | 73mm | 73mm |
Bottom Bracket Height | 284mm | 284mm | 284mm | 286mm | 286mm | 288mm | 288mm | 288mm |
Chainstay Length | 435mm | 435mm | 435mm | 435mm | 435mm | 435mm | 435mm | 435mm |
Chainstay Length Horizontal | 428.1mm | 428.1mm | 428.1mm | 428.5mm | 428.5mm | 428.8mm | 428.8mm | 428.8mm |
Front-Center | 590mm | 595.3mm | 606.8mm | 616mm | 619.5mm | 632.9mm | 643.9mm | 651.5mm |
Front-Center Horizontal | 584.9mm | 590.3mm | 601.9mm | 611.4mm | 614.7mm | 628.7mm | 639.7mm | 647.4mm |
Wheelbase | 1013mm | 1018.4mm | 1030mm | 1039.9mm | 1043.2mm | 1057.5mm | 1068.5mm | 1076.2mm |
Fork Offset/Rake | 50mm | 50mm | 50mm | 50mm | 50mm | 50mm | 50mm | 50mm |
Fork Length (Axle-To-Crown) | 398mm | 398mm | 398mm | 398mm | 398mm | 398mm | 398mm | 398mm |
Trail | 81.6mm very high | 81.6mm very high | 78.2mm high | 78.2mm high | 74.8mm high | 71.4mm high | 71.4mm high | 68.1mm high |
Mechanical Trail | 76.4mm | 76.4mm | 73.5mm | 73.5mm | 70.5mm | 67.5mm | 67.5mm | 64.6mm |
Wheel Flop | 26.8mm | 26.8mm | 25.1mm | 25.1mm | 23.5mm | 22mm | 22mm | 20.5mm |
Standover Height | 721mm | 747mm | 767mm | 787mm | 803mm | 822mm | 844mm | 860mm |
Tire to Pedal Spindle | 64mm 165 mm cranks | 69.3mm 165 mm cranks | 75.8mm 170 mm cranks | 85mm 170 mm cranks | 86mm 172.5 mm cranks | 99.4mm 172.5 mm cranks | 107.9mm 175 mm cranks | 115.5mm 175 mm cranks |
Pedal Spindle to Ground Clearance | 119mm 165 mm cranks | 119mm 165 mm cranks | 114mm 170 mm cranks | 116mm 170 mm cranks | 113.5mm 172.5 mm cranks | 115.5mm 172.5 mm cranks | 113mm 175 mm cranks | 113mm 175 mm cranks |
Base Build
48CM | 50CM | 52CM | 54CM | 56CM | 58CM | 60CM | 62CM | |
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 | 700C/29 in 622 mm BSD |
Tire Width | 50mm | 50mm | 50mm | 50mm | 50mm | 50mm | 50mm | 50mm |
Tire Outer Diameter | 722mm | 722mm | 722mm | 722mm | 722mm | 722mm | 722mm | 722mm |
Bike Length with Tires | 1735mm | 1740.4mm | 1752mm | 1761.9mm | 1765.2mm | 1779.5mm | 1790.5mm | 1798.2mm |
Crank Length | 165mm | 165mm | 170mm | 170mm | 172.5mm | 172.5mm | 175mm | 175mm |
Handlebar Width | 40mm | 40mm | 42mm | 44mm | 44mm | 46mm | 46mm | 46mm |
Stem Length | 70mm | 80mm | 90mm | 90mm | 100mm | 100mm | 110mm | 110mm |
Published Sizing Recommendations
Height | 151 cm to 160 cm | 157 cm to 168 cm | 163 cm to 172 cm | 170 cm to 180 cm | 175 cm to 185 cm | 180 cm to 188 cm | 185 cm to 193 cm | 188 cm to 198 cm |
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://masoncycles.cc/products/exposure-frameset