2025 Basso SV Shimano Dura Ace vs 2024 Specialized Tarmac SL7 Sport
The 54 is the Specialized Tarmac SL7 Sport size closest to your 51 Basso SV Shimano Dura Ace. We match frame stack and reach. This is a geometry comparison, not a fit recommendation; stem, spacers, handlebars and saddle setup also affect your riding position.
What changes on the Specialized Tarmac SL7 Sport
Compared with the Basso SV Shimano Dura Ace in 51, the Specialized Tarmac SL7 Sport in 54 places the top of the head tube 5 mm higher and about as far forward, relative to the bottom bracket. Its wheelbase is 4 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- +5 mm
- Higher front end
- Frame reach
- +1 mm
- About the same reach
- Wheelbase
- −4 mm
- Shorter: quicker to change direction
- Head angle
- +1.0°
- Steeper: sharper steering
- Chainstays
- n/a
- One of the bikes has no number for this
The two frames
We can't draw these frames yet. The Basso SV Shimano Dura Ace numbers we have for size 51 are missing the chainstay length. The numbers below still compare.
Geometry side by side
| Measurement | Basso SV Shimano Dura Ace 51 | Specialized Tarmac SL7 Sport 54 | Difference |
|---|---|---|---|
| Reach | 380 | 381mm | +1 mm |
| Stack | 547 | 552mm | +5 mm |
| Head tube angle | 72 | 73° | +1.0° |
| Seat tube angle | 74.7 | 74° | −0.7° |
| Effective top tube | 530 | not listed | |
| Wheelbase | 982 | 978mm | −4 mm |
| Standover | 772 | 768mm | −4 mm |
| Seat tube length | 485 | 475mm | −10 mm |
| Head tube length | 140 | 131mm | −9 mm |
| Chainstay length | not listed | 410mm | |
| BB drop | not listed | 72mm | |
| BB height | not listed | 268mm | |
| Fork length | not listed | 366mm |
Differences are the Specialized Tarmac SL7 Sport minus the Basso SV Shimano Dura Ace. Full charts: 2025 Basso SV Shimano Dura Ace, 2024 Specialized Tarmac SL7 Sport.
Where each sits in its class
Basso SV Shimano Dura AceSpecialized Tarmac SL7 Sport
Each bike is ranked against the other road bikes on Quiver, on frame geometry alone. Not your hand position or ride feel.
What each ships with
The stock build of each bike's first listed trim. Parts that match are dimmed.
| Part | Basso SV Shimano Dura AceShimano Dura Ace Di2 | Specialized Tarmac SL7 SportSport |
|---|---|---|
| Frame | Basso SV | Specialized Tarmac SL7 FACT |
| Shifter | Shimano Dura-Ace R9270 | Shimano 105 |
| Derailleur | Shimano Dura-Ace R9250 | Shimano 105 |
| Cassette | Shimano Dura-Ace R9200 | Shimano 105 |
| Chain | Shimano Dura-Ace | Shimano SLX M7100 |
| Crankset | Shimano Dura-Ace R9200 | Shimano 105 |
| Chainring | Shimano 52, Shimano 36 | not listed |
| Bottom bracket | Shimano Dura-Ace R9200 | not listed |
| Wheelset | DT Swiss ARC 1100 | DT Swiss R470 |
| Tire | Continental Grand Prix 5000 | Specialized Turbo Pro |
| Brake | Shimano Dura-Ace R9270 | Shimano 105 |
| Rotor | Shimano Dura Ace Ice Rotor | not listed |
| Handlebar | Basso Fuga Integrated | not listed |
| Stem | Basso Fuga Integrated | not listed |
| Saddle | Selle Italia SLR Superflow | Specialized Power Sport |
| Seatpost | not listed | Specialized S-Works Tarmac |
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