Specialized Tarmac SL8 2025 geometry

A size-by-size geometry profile with manufacturer provenance and RideDNA consistency-audit context. Use the complete table to compare fit and handling before opening the interactive tools.

Specialized Tarmac SL8 2025 geometry chart

Source: Manufacturer geometry source

Published geometry by size

Provenance: published is present in the manufacturer data; derived is calculated by RideDNA; manual is a staff-entered reference rather than a manufacturer-chart value. “Not published” means the manufacturer did not provide a value for that size.

SizeStackReachHTASTAETTChainstayWheelbaseFront centerBB dropTrailFork offsetAudit context
44 501 mm published366 mm published70.5 ° derived75.5 ° derived496 mm derived410 mm derived970 mm published572 mm published74 mm derived71.0 mm published47 mm published green
All 5 consistency checks passed
49 514 mm published375 mm published71.8 ° derived75.5 ° derived509 mm derived410 mm derived973 mm published574 mm published74 mm derived63.0 mm published47 mm published green
All 5 consistency checks passed
52 527 mm published380 mm published72.5 ° derived74.0 ° derived531 mm derived410 mm derived975 mm published577 mm published74 mm derived58.0 mm published47 mm published green
All 5 consistency checks passed
54 544 mm published384 mm published73.0 ° derived74.0 ° derived541 mm derived410 mm derived978 mm published579 mm published72 mm derived58.0 mm published44 mm published green
All 5 consistency checks passed
56 565 mm published395 mm published73.5 ° derived73.5 ° derived563 mm derived410 mm derived991 mm published592 mm published72 mm derived55.0 mm published44 mm published green
All 5 consistency checks passed
58 591 mm published402 mm published73.5 ° derived73.5 ° derived577 mm derived410 mm derived1006 mm published606 mm published72 mm derived55.0 mm published44 mm published green
All 5 consistency checks passed
61 612 mm published408 mm published74.0 ° derived73.0 ° derived595 mm derived410 mm derived1013 mm published613 mm published72 mm derived52.0 mm published44 mm published green
All 5 consistency checks passed

Audit context

Overall consistency: green. This context is shown alongside the table so a rider can distinguish a complete published specification from a value that RideDNA had to derive or could not independently verify.

The Specialized Tarmac SL8 geometry specification demonstrates strong internal consistency across all seven sizes. All checks — stack, reach, wheelbase, front center, and trail — reconcile within ±1mm engineering tolerance. The RideDNA Geometry Engine reconciliation confirms internal self-consistency, with all back-calculated dimensions aligning within ±1mm (or ±0.2° for angles). One diagnostic note: seat tube angle shows an unusually large step of 1.5° between sizes 49 and 52 (75.5° → 74°), which may warrant verification — the root cause cannot be determined from the published geometry data alone.

Next steps

More Specialized geometry profiles