2025 3T Cycling Ultra 650B 48
Build
650B/27.5 in × 2.1 in
Insights
Somewhat upright 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 | 520mm |
| Reach | 351mm |
| Stack to Reach Ratio | 1.48:1 |
| Seat Tube Length, C-T | 436mm |
| Top Tube Length, Effective/Horizontal HT Top | 510mm |
| Top Tube Slope | 12.1deg |
| Head Tube Angle | 68.5deg |
| Seat Tube Angle | 74deg |
| Head Tube Length | 122mm |
| Bottom Bracket Drop | 79mm |
| Bottom Bracket Height | 266.3mm |
| Chainstay Length | 419mm |
| Chainstay Length Horizontal | 411.5mm |
| Front-Center | 597mm |
| Front-Center Horizontal | 591.8mm |
| Wheelbase | 1003.2mm |
| Fork Offset/Rake | 62.4mm |
| Fork Length (Axle-To-Crown) | 375mm |
| Trail | 69mm high |
| Mechanical Trail | 64.2mm |
| Wheel Flop | 23.5mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 81.7mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 96.3mm |
650B Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 2.1in |
| Tire Outer Diameter | 690.7mm |
| Bike Length with Tires | 1693.9mm |
| 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