A size-focused comparison of the Colnago V4 and Specialized Tarmac SL8, with official-source geometry and clear model-scope limitations.
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Best for: Riders comparing Colnago race-frame sizing
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Best for: Racers comparing the SL8 fit envelope
| Aspect | Colnago V4 | Specialized Tarmac SL8 |
|---|---|---|
| Example stack | 539 mm at 485 | 544 mm at 54 |
| Example reach | 383 mm at 485 | 384 mm at 54 |
| Larger example stack | 575 mm at 530 | 565 mm at 56 |
| Larger example reach | 395 mm at 530 | 395 mm at 56 |
| Size-label interpretation | Current 420-570 system | 44-61 nominal road sizes |
| Measurement | Colnago V4 | Specialized Tarmac SL8 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Size | 420 | 455 | 485 | 530 | 550 | 570 | 44 | 49 | 52 | 54 | 56 | 58 | 61 |
| Stack (mm) | 510 | 522 | 539 | 575 | 593 | 612 | 501 | 514 | 527 | 544 | 565 | 591 | 612 |
| Reach (mm) | 370 | 375 | 383 | 395 | 403 | 410 | 366 | 375 | 380 | 384 | 395 | 402 | 408 |
Comparing a different size or generation? Use the bike geometry comparison tool with the exact frame charts instead of assuming matching size labels mean matching fit.
Source-backed geometry used in this table
For now this pilot only covers stack and reach. We still do not have standover, top tube, wheelbase, or angle data in a verified record here, so the page stops short of making a stronger fit call.
V4 485 measures 539/383 mm stack/reach. Tarmac SL8 54 measures 544/384 mm, adding 5 mm stack and 1 mm reach at the frame.
V4 485 and Tarmac SL8 54 are close enough in these two frame dimensions to deserve a direct cockpit comparison. They are not identical bikes, and neither a nominal size nor a near-matching stack/reach pair guarantees the final fit.