2025 TanTan Cycling (Seraph) FM539 29" 440
Build
700C/29 in × 2.4 in
Insights
Somewhat aggressive stack and reach vs trend of hardtail cross-country mtb bikes
Design deviates from other sizes of TanTan Cycling (Seraph) FM539
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Stack and Reach vs. Category Trend
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Geometry
| Stack | 605mm |
| Reach | 444mm |
| Stack to Reach Ratio | 1.36:1 |
| Seat Tube Length, Effective Unknown | 440mm |
| Top Tube Length, Effective/Horizontal Unknown | 602mm |
| Head Tube Angle | 67.9deg |
| Seat Tube Angle | 75.4deg |
| Head Tube Length | 95mm |
| Bottom Bracket Drop | 61.2mm |
| Bottom Bracket Height | 310.7mm |
| Chainstay Length | 425mm |
| Chainstay Length Horizontal | 420.6mm |
| Front-Center | 731mm |
| Front-Center Horizontal | 728.4mm |
| Wheelbase | 1149mm |
| Fork Offset/Rake | 59mm |
| Trail | 87.4mm very high |
| Mechanical Trail | 81mm |
| Wheel Flop | 30.5mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 189mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 140.7mm |
29" Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 2.4in |
| Tire Outer Diameter | 743.9mm |
| Bike Length with Tires | 1892.9mm |
| Suspension Type | Hardtail (Front suspension) |
| Bar Type | Flat Bar |
| Fork Travel | Unknown |
| Suspension Sag | Unknown |
| Frame Material | Unknown |
| Fork Material | Unknown |
| Brake Type | Unknown |
Source:www.seraphbikes.com