Tallboy (2027) vs. Stumpjumper 15 (2025)

A

Santa Cruz · Trail · 29″Manufacturer data · as of Oct 18, 2026Source

Cockpit: 15 mm spacers · 45 mm stem · 0°

SpacersStemAngle °

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

Saddle heightSetbackForward (+)/back

B

Specialized · Trail · 29″Manufacturer data · as of Oct 18, 2026Source

Cockpit: 15 mm spacers · 45 mm stem · 0°

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

Stumpjumper 15 (2025) S3 vs. Tallboy (2027) M · High: 5 mm less reach · 0.6° slacker head angle

Measure	Tallboy (2027) M · High	Stumpjumper 15 (2025) S3
Frame
Stackmm	624	627+3
Reachmm	455	450−5
Stack / Reach	1.37	1.39+0.02
Head angle°	65.1°	64.5°−0.6°
Seat angle°	77.3°	77.0°−0.3°
Head tubemm	115	110−5
Seat tubemm	400	405+5
Top tube (effective)mm	596	595−1
Chainstaymm	435	435±0
Rear centre (horizontal)mm	434	433±0
Wheelbasemm	1212	1213+1
Front centremm	777	780+3
BB dropmm	36	38+2
BB heightmm	336	337+1
Fork offsetmm	46	44−2
Trailmm	122	130+8
Fork axle-to-crownmm	–	561
Cockpit & riding position
Bar reachmm	481	476−6
Bar stackmm	675	678+3
Saddle – barmm	639	638−2
Saddle-to-bar dropmm	28	24−4

italic = calculated · tap a row to pin the measure in the drawing · Δ relative to Tallboy (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: 158 mm behind · 702 mm above BB
Handlebar: 481 mm ahead · 675 mm above BB
Saddle–bar: 639 mm · drop 28 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.

Explore

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 Tallboy (2027) M · High

only Trail

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

Add a bike

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