Fourstroke R 01 (2027) vs. Blur (2027)

A

BMC · Cross-country · 29″Manufacturer data · as of Oct 18, 2026Source

Cockpit: 15 mm spacers · 60 mm stem · 0° (stock)

SpacersStemAngle °

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

Saddle heightSetbackForward (+)/back

B

Santa Cruz · Cross-country · 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

Blur (2027) M vs. Fourstroke R 01 (2027) M: 7 mm less reach · 0.5° slacker head angle · 0.4° steeper seat angle · 21 mm less bar reach

Measure	Fourstroke R 01 (2027) M	Blur (2027) M
Frame
Stackmm	592	588−4
Reachmm	457	450−7
Stack / Reach	1.30	1.31+0.01
Head angle°	66.5°	66.0°−0.5°
Seat angle°	75.6°	76.0°+0.4°
Head tubemm	93	90−3
Seat tubemm	440	405−35
Top tube (effective)mm	599	596−3
Chainstaymm	431	435+4
Rear centre (horizontal)mm	429	433+4
Wheelbasemm	1172	1178+6
Front centremm	743	743±0
BB dropmm	38	39+1
BB heightmm	334	334±0
Fork offsetmm	44	46+2
Trailmm	115	116+1
Fork axle-to-crownmm	530	–
Cockpit & riding position
Bar reachmm	498	477−21
Bar stackmm	648	638−10
Saddle – barmm	677	651−26
Saddle-to-bar dropmm	49	60+11

italic = calculated · tap a row to pin the measure in the drawing · Δ relative to Fourstroke R 01 (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: 179 mm behind · 697 mm above BB
Handlebar: 498 mm ahead · 648 mm above BB
Saddle–bar: 677 mm · drop 49 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 Fourstroke R 01 (2027) M

only Cross-country

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