Trek Madone SL Gen 8 (2025) – geometry

Name: Trek Madone SL Gen 8 (2025)
Brand: Trek

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

Measure	Madone SL Gen 8 (2025) M
Frame
Stackmm	546
Reachmm	384
Stack / Reach	1.42
Head angle°	72.9°
Seat angle°	73.6°
Head tubemm	136
Seat tubemm	476
Top tube (effective)mm	545
Chainstaymm	410
Rear centre (horizontal)mm	404
Wheelbasemm	981
Front centremm	582
BB dropmm	70
BB heightmm	269
Fork offsetmm	45
Trailmm	58
Fork axle-to-crownmm	–
Cockpit & riding position
Bar reachmm	470
Bar stackmm	603
Saddle – barmm	674
Saddle-to-bar dropmm	87

italic = calculated · tap a row to pin the measure in the drawing · Δ relative to Madone SL Gen 8 (2025)

Geometry table Trek Madone SL Gen 8 (2025)

Road · 700c · Sizes XS–XL · Stack 507–610 mm · Reach 370–402 mm · Head angle 71.6–73.9°

Measure	XS	S	M	ML	L	XL
Stackmm	507	530	546	562	582	610
Reachmm	370	378	384	389	394	402
Stack / Reach	1.37	1.40	1.42	1.44	1.48	1.52
Head angle°	71.6°	72.2°	72.9°	73.5°	73.8°	73.9°
Seat angle°	73.8°	73.8°	73.6°	73.4°	73.4°	73.4°
Head tubemm	100	121	136	150	172	201
Seat tubemm	404	440	476	512	548	609
Top tube (effective)mm	517	532	545	557	568	584
Chainstaymm	410	410	410	410	411	412
Rear centre (horizontal)mm	404	404	404	404	405	406
Wheelbasemm	971	976	981	980	990	1007
Front centremm	572	577	582	581	589	604
BB dropmm	72	72	70	70	68	68
BB heightmm	267	267	269	269	271	271
Fork offsetmm	50	45	45	40	40	40
Trailmm	61	62	58	59	57	57

italic = calculated from the other values · Source: Geometry table Trek, as of Oct 25, 2026

Size finder · transfer your fit

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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.

Your bike – how you sit today

Saddle

mmmmmm

Cockpit

mmmm°

Saddle: 203 mm behind · 691 mm above BB
Handlebar: 470 mm ahead · 603 mm above BB
Saddle–bar: 674 mm · drop 87 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.

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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 Madone SL Gen 8 (2025) M

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

Trek Madone SL Gen 8 (2025) – geometry

Similar geometry

Similar to Madone SL Gen 8 (2025) M

Geometry profile