2025 3T Cycling Ultra 650B 61
Build
650B/27.5 in × 2.1 in
Insights
Average stack and reach vs trend of all-road/gravel bikes
Design deviates from other sizes of 3T Cycling Ultra
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 632mm |
| Reach | 399mm |
| Stack to Reach Ratio | 1.58:1 |
| Seat Tube Length, C-T | 576mm |
| Top Tube Length, Effective/Horizontal HT Top | 593mm |
| Top Tube Slope | 8deg |
| Head Tube Angle | 72.5deg |
| Seat Tube Angle | 74deg |
| Head Tube Length | 225mm |
| Bottom Bracket Drop | 75mm |
| Bottom Bracket Height | 270.3mm |
| Chainstay Length | 419mm |
| Chainstay Length Horizontal | 412.2mm |
| Front-Center | 636mm |
| Front-Center Horizontal | 631.6mm |
| Wheelbase | 1043.8mm |
| Fork Offset/Rake | 54.3mm |
| Fork Length (Axle-To-Crown) | 375mm |
| Trail | 51.9mm mid/neutral |
| Mechanical Trail | 49.5mm |
| Wheel Flop | 14.9mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 120.7mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 100.3mm |
650B Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 2.1in |
| Tire Outer Diameter | 690.7mm |
| Bike Length with Tires | 1734.5mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Drop Bar |
| Frame Material | Carbon/Composite |
| Fork Material | Carbon/Composite |
| Brake Type | Disc |
Source:https://us.3t.bike/products/ultra-grx-1x12-650b?variant=45577021620381