2019 Berthoud Cycles JM-19 Base 51
Build
650B/27.5 in × 38 mm
Insights
Average stack and reach vs trend of all-road/gravel bikes
Design deviates from other sizes of Berthoud Cycles JM-19
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 540mm |
| Reach | 363mm |
| Stack to Reach Ratio | 1.49:1 |
| Seat Tube Length, C-C | 510mm |
| Top Tube Length, Effective/Horizontal Center | 530mm |
| Head Tube Angle | 70deg |
| Seat Tube Angle | 73deg |
| Bottom Bracket Drop | 67mm |
| Bottom Bracket Height | 263mm |
| Chainstay Length | 430mm |
| Chainstay Length Horizontal | 424.8mm |
| Front-Center | 602.7mm |
| Front-Center Horizontal | 599mm |
| Wheelbase | 1023.8mm |
| Fork Offset/Rake | 60mm |
| Trail | 56.3mm mid/neutral |
| Mechanical Trail | 52.9mm |
| Wheel Flop | 18.1mm |
| Standover Height | 781mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 102.7mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 93mm |
Base Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 38mm |
| Tire Outer Diameter | 660mm |
| Bike Length with Tires | 1683.8mm |
| Crank Length | 170mm |
| Handlebar Width | 420mm |
| Stem Length | 80mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Drop Bar |
| Frame Material | Steel |
| Fork Material | Steel |
| Brake Type | Disc |
Source:http://www.gillesberthoud.fr/pret-a-rouler/index.php (+ Berthoud direct via Bike Insights)