2025 Oak Twilight Base
- Category
- Performance Road
- Design
- Drop Bar, Rigid, non-suspension corrected
- Frame
- Carbon/Composite
- Fork
- Carbon/Composite
- Features
- Disc brake
Average stack and reachvs category | Average stack and reachvs category | Average stack and reachvs category | Average stack and reachvs category | Average stack and reachvs category | Average stack and reachvs category | Average stack and reachvs category | Somewhat aggressive stack and reachvs category | Average stack and reachvs category | Somewhat aggressive stack and reachvs category | Average stack and reachvs category | Average stack and reachvs category |
Geometry
3xs | 2XS | 2XS | xs | XS | s | S | m | M | L | L | XL | XL | |
Stack | — | 508mm | 508mm | 517mm | 517mm | 529mm | 529mm | 545mm | 545mm | 567mm | 567mm | 595mm | 595mm |
Reach | — | 368mm | 368mm | 375mm | 375mm | 383mm | 383mm | 391mm | 391mm | 399mm | 399mm | 409mm | 409mm |
Stack to Reach Ratio | — | 1.38:1 | 1.38:1 | 1.38:1 | 1.38:1 | 1.38:1 | 1.38:1 | 1.39:1 | 1.39:1 | 1.42:1 | 1.42:1 | 1.45:1 | 1.45:1 |
Seat Tube Length, C-T | — | 420mm | — | — | 450mm | — | 480mm | — | 510mm | — | 540mm | — | 580mm |
Seat Tube Length, Effective Unknown | — | — | 70.8mm | 71.4mm | — | 72mm | — | 72.8mm | — | 73mm | — | 73mm | — |
Top Tube Length, Actual C-C | — | 509mm | 509mm | 523mm | 523mm | 535mm | 535mm | 546mm | 546mm | 572mm | 572mm | 593mm | 593mm |
Top Tube Slope | — | 12.1deg | — | — | 9.6deg | — | 7.5deg | — | 6deg | — | 5.2deg | — | 4deg |
Head Tube Angle | — | 70.8deg | 410deg | 410deg | 71.4deg | 410deg | 72deg | 410deg | 72.8deg | 410deg | 73deg | 410deg | 73deg |
Seat Tube Angle | — | 75deg | 75deg | 74.5deg | 74.5deg | 74deg | 74deg | 73.5deg | 73.5deg | 73deg | 73deg | 73deg | 73deg |
Head Tube Length | — | 106mm | — | — | 114mm | — | 124mm | — | 139mm | — | 161mm | — | 191mm |
Bottom Bracket Drop | — | 71mm | -79mm | -109mm | 71mm | -139mm | 71mm | -169mm | 70mm | -199mm | 70mm | -239mm | 70mm |
Bottom Bracket Height | — | 268mm | 420mm | 450mm | 268mm | 480mm | 268mm | 510mm | 269mm | 540mm | 269mm | 580mm | 269mm |
Chainstay Length | — | 410mm | 106mm | 114mm | 410mm | 124mm | 410mm | 139mm | 410mm | 161mm | 410mm | 191mm | 410mm |
Chainstay Length Horizontal | — | 403.8mm | 70.7mm | 33.4mm | 403.8mm | — | 403.8mm | — | 404mm | — | 404mm | — | 404mm |
Front-Center | — | 572.6mm | — | — | 576.6mm | — | 583.5mm | — | 589.2mm | — | 602.1mm | — | 621mm |
Front-Center Horizontal | — | 568.2mm | — | — | 572.2mm | — | 579.2mm | — | 585mm | — | 598mm | — | 617mm |
Wheelbase | — | 972mm | — | — | 976mm | — | 983mm | — | 989mm | — | 1002mm | — | 1021mm |
Fork Offset/Rake | — | 45.3mm | — | — | 44.6mm | — | 45.1mm | — | 44.9mm | — | 45mm | — | 45.4mm |
Trail | — — | 70mm high | — — | — — | 67mm high | — — | 62.8mm mid/​neutral | — — | 58mm mid/​neutral | — — | 56.6mm mid/​neutral | — — | 56.1mm mid/​neutral |
Mechanical Trail | — | 66.1mm | — | — | 63.5mm | — | 59.7mm | — | 55.4mm | — | 54.1mm | — | 53.7mm |
Wheel Flop | — | 21.8mm | — | — | 20.3mm | — | 18.5mm | — | 16.4mm | — | 15.8mm | — | 15.7mm |
Tire to Pedal Spindle | — 170 mm cranks | 63.6mm 170 mm cranks | — 165 mm cranks | — 165 mm cranks | 67.6mm 170 mm cranks | — 165 mm cranks | 74.5mm 170 mm cranks | — 165 mm cranks | 80.2mm 170 mm cranks | — 170 mm cranks | 93.1mm 170 mm cranks | — 170 mm cranks | 112mm 170 mm cranks |
Pedal Spindle to Ground Clearance | — 170 mm cranks | 98mm 170 mm cranks | 255mm 165 mm cranks | 285mm 165 mm cranks | 98mm 170 mm cranks | 315mm 165 mm cranks | 98mm 170 mm cranks | 345mm 165 mm cranks | 99mm 170 mm cranks | 370mm 170 mm cranks | 99mm 170 mm cranks | 410mm 170 mm cranks | 99mm 170 mm cranks |
Base Build
3xs | 2XS | 2XS | xs | XS | s | S | m | M | L | L | XL | XL | |
Wheel Size | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD |
Tire Width | 30mm | 28mm | 30mm | 30mm | 28mm | 30mm | 28mm | 30mm | 28mm | 30mm | 28mm | 30mm | 28mm |
Tire Outer Diameter | 682mm | 678mm | 682mm | 682mm | 678mm | 682mm | 678mm | 682mm | 678mm | 682mm | 678mm | 682mm | 678mm |
Bike Length with Tires | — | 1650mm | — | — | 1654mm | — | 1661mm | — | 1667mm | — | 1680mm | — | 1699mm |
Crank Length | — | — | 165mm | 165mm | — | 165mm | — | 165mm | — | 170mm | — | 170mm | — |
Handlebar Width | — | 360mm | 90mm | 100mm | 380mm | 110mm | 380mm | 110mm | 380mm | 120mm | 380mm | 130mm | 400mm |
Stem Length | — | 90mm | — | — | 100mm | — | 110mm | — | 110mm | — | 120mm | — | 130mm |
Published Sizing Recommendations
Height | — | — | 13 ft 7 in to | 13 ft 7 in to | — | 14 ft 1 in to | — | 14 ft 7 in to | — | 15 ft 1 in to | — | 16 ft 1 in to | — |
PBH | — | — | 972 in to | 976 in to | — | 983 in to | — | 989 in to | — | 1002 in to | — | 1021 in to | — |
Stack and Reach vs. Category Trend
Very Upright
Somewhat Upright
Average
Somewhat Aggressive
Very Aggressive
The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.
Learn more about the Upright/Aggressive ScaleCategory Trend
Performance RoadSource:https://www.oak.cc/bikes/p/twilight-shimano-105-di2, https://www.oak.cc/bikes/p/twilight-frameset