2021 Transition Bikes Spire Base SM Low
Build
700C/29 in × 2.4 in
Insights
Somewhat upright stack and reach vs trend of full-suspension all-mountain/enduro mtb bikes
Design deviates from other sizes of Transition Bikes Spire
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 624mm |
| Reach | 425mm |
| Stack to Reach Ratio | 1.47:1 |
| Seat Tube Length, Unknown | 360mm |
| Top Tube Length, Effective/Horizontal Unknown | 550mm |
| Head Tube Angle | 62.5deg |
| Effective Seat Tube Angle, Unknown | 79.1deg |
| Head Tube Length | 100mm |
| Bottom Bracket Drop | 32mm |
| Bottom Bracket Height | 340mm |
| Chainstay Length | 448mm |
| Chainstay Length Horizontal | 446.9mm |
| Front-Center | 782.8mm |
| Front-Center Horizontal | 782.1mm |
| Wheelbase | 1229mm |
| Fork Offset/Rake | 44mm |
| Fork Length (Axle-To-Crown) | 584mm |
| Trail | 144mm very high |
| Mechanical Trail | 127.8mm |
| Wheel Flop | 59mm |
| Standover Height | 680mm |
| Tire to Pedal Spindle Distance With 165 mm cranks | 245.8mm |
| Pedal Spindle to Ground Clearance With 165 mm cranks | 175mm |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 2.4in |
| Tire Outer Diameter | 743.9mm |
| Bike Length with Tires | 1972.9mm |
| Crank Length | 165mm |
| Handlebar Width | 800mm |
| Stem Length | 20mm |
| Suspension Type | Full suspension |
| Bar Type | Flat Bar |
| Fork Travel | 170mm |
| Rear Travel | 170mm |
| Suspension Sag | Unknown |
| Frame Material | Unknown |
| Fork Material | Unknown |
| Brake Type | Disc |
Published Sizing Recommendations
| Height | 5 ft 0 in to 5 ft 6 in |
Source:https://www.transitionbikes.com/Bikes_Spire.cfm