Tarmac SL9 (2027) vs. Madone SL Gen 8 (2025)

A

Specialized · Road · 700cManufacturer data · as of Oct 25, 2026Source

Cockpit: 20 mm spacers · 100 mm stem · -6° (stock)

SpacersStemAngle °

Saddle: same saddle height · 0 mm setback · centred (default)

Saddle heightSetbackForward (+)/back

B

Trek · Road · 700cManufacturer data · as of Oct 25, 2026Source

Cockpit: 20 mm spacers · 100 mm stem · -6°

SpacersStemAngle °

Saddle: same saddle height · 0 mm setback · centred (default)

Saddle heightSetbackForward (+)/back

Reach: Horizontal distance from the bottom bracket to the top of the head tube. More reach = more stretched-out position. · grid 10 cm

Madone SL Gen 8 (2025) M vs. Tarmac SL9 (2027) 54: 0.4° steeper head angle · 0.4° slacker seat angle

Measure	Tarmac SL9 (2027) 54	Madone SL Gen 8 (2025) M
Frame
Stackmm	544	546+2
Reachmm	384	384±0
Stack / Reach	1.42	1.42+0.01
Head angle°	72.5°	72.9°+0.4°
Seat angle°	74.0°	73.6°−0.4°
Head tubemm	140	136−4
Seat tubemm	473	476+3
Top tube (effective)mm	540	545+5
Chainstaymm	410	410±0
Rear centre (horizontal)mm	404	404±0
Wheelbasemm	986	981−5
Front centremm	582	582±0
BB dropmm	72	70−2
BB heightmm	268	269+1
Fork offsetmm	47	45−2
Trailmm	58	58±0
Fork axle-to-crownmm	370	–
Cockpit & riding position
Bar reachmm	470	470±0
Bar stackmm	602	603+1
Saddle – barmm	668	674+5
Saddle-to-bar dropmm	90	87−3

italic = calculated · tap a row to pin the measure in the drawing · Δ relative to Tarmac SL9 (2027)

Size finder · transfer your fit

Transfer your riding position to a new bike

Enter your well-fitting bike with saddle height, seatpost and cockpit. For every size of the new bike we calculate the stem, spacers, saddle height, setback and saddle position that reproduce the same contact points. This is a geometric approximation without guarantee and does not replace a professional bike fit.

1

Your bike – how you sit today

Saddle

mmmmmm

Cockpit

mmmm°

Saddle: 198 mm behind · 692 mm above BB
Handlebar: 470 mm ahead · 602 mm above BB
Saddle–bar: 668 mm · drop 90 mm

Saddle height: bottom bracket centre to top of saddle along the seat-tube axis. Saddle fore/aft: + forward, − back. Spacers incl. top cap, handlebar centre = stem clamp.

2

New bike – what do I need to set up?

Choose the bike you want to transfer your position to. We calculate every size.

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All frame sizes at a glance

All frame sizes by stack and reach or any other measure – click a dot or line to add the bike to the comparison.

1040 of 1040 sizes · 159 models

Each dot is a frame size. Coloured dots with a letter = current comparison.

Similar to Tarmac SL9 (2027) 54

only Road

Similarity over the axes of the geometry profile below; stack and reach count 1.5×. The best-matching size per model, filters are respected.

Geometry profile

Each line is a frame size across all selected measures. Drag on an axis to filter a range – this also affects the chart and the similarity list.

Drag on an axis to filter a range · click a line to compare the bike

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BrandModelModel year *CategoryWheel (front)Wheel rearTyre clearance, max. (mm)Source (manufacturer page with geometry table) *

Paste a geometry table

Select the table on the manufacturer's page, copy it and paste it here. Sizes as columns or rows, German or English; values like “435/432” for flip chips are recognised.

Sizes (mm / degrees · * required · setting e.g. “High”, “Low”, “Mullet”)

Size*	Setting	Stack*	Reach*	Head ∠ °*	Seat ∠ °*	Head tube*	Chainstay*	BB drop*	BB drop rear	Seat tube	Top tube	Wheelbase	Fork offset	Axle-to-crown	BB height	Front ctr.	Trail	Stem	Spacers