非听实验室·Fitting Lab

Data Observatory

Statistical patterns gathered from fitting records worldwide — body proportions, ethnic differences, size distribution and bike-model coverage.

Global Distribution

LowHigh Bubble size ∝ records

Patterns in the Data

Height distribution

Frame size distribution

Ethnic-group body-ratio ladder

Inseam-to-height ratio by ethnic group, low to high; the dashed line is the global baseline.

Frame spread at the same height

Bike Frame Library

Frame geometry collected from official sites — cm / ° units, newest first.｜ We also keep older model years of many brands in our big-data corpus — fitting results match and recommend those too. Questions? Email: friends@fittinglab.ai

BIANCHI Arcadex Gravel

Source：www.bianchi.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
XS 54.4 37.6 52.7 41 9 70.5 74.5
SM 56.3 38.3 54.5 44.8 11 70.5 74
MD 58.4 39.1 56.4 48.5 13 71 73.5
LG 61 40.2 58.3 51.5 15.5 71.5 73.5
XL 63.8 41 60.5 55 18.5 71.5 73
BIANCHI Sprint Road

Source：www.bianchi.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
470 49.7 37.7 51.5 42 10.5 70.5 74.5
500 50.5 38.3 52.5 45 11 71.5 74.5
530 52.9 38.4 53.5 48 12.5 72 74
550 54.5 38.8 55 50 14 73 73.5
570 56.1 39.3 56 52 15.5 73 73.5
590 58 39.6 57.5 54 17.5 73 73
610 59.9 39.7 58.5 56 19.5 73 72.5
BIANCHI Infinito Road

Source：www.bianchi.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
470 53.1 37 51.2 42 11.5 70.5 75
500 55.2 37.2 52.5 45 13.5 71 74.5
530 56.6 37.3 53.5 48 15 71 74
550 58.4 37.7 55 50 16.5 72 73.5
570 60 38.2 56 52 18 72.5 73.5
590 61.45 38.4 57.2 54 19.5 72.5 73
610 62.9 38.7 58.5 56 21 72.5 72.5
BIANCHI Oltre Road

Source：www.bianchi.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
470 47 38.5 51.5 45 8.3 70.5 74.5
500 47.8 39.2 52.5 48 8.8 71.5 74.5
530 50.4 39.3 53.6 51 10.3 72 74
550 52 39.7 55 53 11.8 72.5 73.5
570 53.6 40.2 56 55 13.3 73 73.5
590 55.5 40.6 57.5 57 15.3 73 73
BMC Kaius 01 ONE Gravel

Source：bmc-switzerland.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
47 51 39 54.6 42.8 8.5 71 73
51 53 39.7 55.9 45.2 10.6 71 73
54 55 40.1 56.9 46.8 12.3 72 73
56 57 40.5 57.9 49.3 14.4 72 73
58 59.5 41 59.2 51.3 17 72 73
61 62 41.4 60.4 53.3 19.6 72 73
BMC Teammachine R 01 ONE Road

Source：bmc-switzerland.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
47 50.4 36.8 51.5 41.8 10.8 71.5 74
51 52.8 37.8 53.2 46.3 13.3 71.5 74
54 54.8 38.7 55.2 49.9 14.9 72.3 73.5
56 56.3 39.3 56.2 51.9 16.5 72.3 73.5
58 58.2 40.2 58.2 54.1 18.4 72.3 73
61 60.8 40.9 59.8 57 21.1 72.3 73
BMC Teammachine SLR 01 ONE Road

Source：bmc-switzerland.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
47 50.6 36.7 51.5 42.2 10.8 71.5 74
51 53 37.7 53.2 46.4 13.3 71.5 74
54 55 38.6 55.2 49.1 14.9 72.3 73.5
56 56.5 39.2 56.2 50.9 16.5 72.3 73.5
58 58.4 40.1 58.2 53 18.4 72.3 73
61 60.8 40.9 59.8 55.5 21.1 72.3 73
BMC Roadmachine 01 ONE Road

Source：bmc-switzerland.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
47 52.5 37 52 41.4 11.2 71.4 74.2
51 55 37.9 53.7 46.1 13.8 71.4 74.2
54 57 38.3 54.6 48.8 15.4 72.2 74.2
56 59.5 38.8 55.9 50.8 18.1 72.2 74.2
58 62 39.3 57.1 52.9 20.7 72.2 74.2
61 64.5 39.8 58.1 55 23.3 72.2 74.2
PASSONI Cicloprato RTR Gravel

Source：passoni.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
48 51.8 37.4 51.4 45.5 10.5 71.3 75
50 53.1 37.7 52 47.3 11.8 71.5 75
52 54.9 38.1 53.4 49.9 13.3 72.5 74.5
54 56.3 38.3 54.5 51.8 14.8 73 74
57 58.6 39.5 56.9 54.5 17 73.5 73.5
60 61.4 40.5 58.7 57.7 19.8 74 73.5
PASSONI Animus AT-01 Road

Source：passoni.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
48 54.7 36.3 51.9 53 13.4 69 74.5
50 55.2 37 52.7 53.5 13.7 69.5 74.5
52 55.9 37.5 53.8 54.2 14.2 70 74
54 57.8 38 54.8 56.4 16 70.5 74
56 59.4 38.7 55.9 58.1 17.3 71.5 74
58 61.8 39.6 57.5 60.5 19.8 71.5 74
60 64.4 40.5 59.1 63.3 22.4 72 74
PASSONI Prima Disco Road

Source：passoni.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
48 51.9 36.1 50 49.5 13 69 75.5
50 52.6 36.8 51.3 50.3 13.4 70 75
52 54 37.5 52.7 52 14.5 71 74.5
54 55.9 38.3 54.5 54.1 16.4 71.5 74
56 58.4 38.9 56 56.7 18.8 72 73.8
58 60.8 39.4 58 59.5 21.1 72.5 73
60 62.2 40.5 59.6 61 22.5 72.5 73
MOULTON THE HALL SE Folding

Source：www.moultonbicycles.co.uk Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
One Size 52.5 37.7 — 45 25.4 — —
MOULTON FLYTE Folding

Source：www.moultonbicycles.co.uk Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
One Size 49.6 39.9 — 45 23 — —
MOULTON XTB Folding

Source：www.moultonbicycles.co.uk Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
One Size 52.5 — — 45 25.4 — —
MOULTON SST Folding

Source：www.moultonbicycles.co.uk Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
One Size 52.5 — — 45 25.4 — —
MOULTON Jubilee Folding

Source：www.moultonbicycles.co.uk Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
One Size 46.5 — — 38 21.8 — —
MOULTON TSR Folding

Source：www.moultonbicycles.co.uk Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
One Size 52.5 — — 45 25.4 — —
LOOK G85 Cezal Gravel

Source：www.lookcycle.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
XS 54.7 36 51.16 47 8.25 69.5 74
S 56.6 37 52.71 49 10.28 69.5 74
M 59 38 54.4 51 12.88 70 74
L 61.4 39 56.09 53 15.44 70 74
XL 63.8 40 57.78 55 18.02 70.5 74
LOOK 785 Huez RS Road

Source：www.lookcycle.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
XS 51.92 36.53 50.93 48 9.44 71.5 74.5
S 54.33 37.53 52.6 50.4 11.96 71.5 74.5
M 56.73 38.56 54.3 53 14.07 73 74.5
L 59.13 39.55 55.96 55.4 16.58 73 74.5
XL 61.53 40.56 57.63 57.9 19.35 73 74.5
LOOK 795 Blade RS 3 Road

Source：www.lookcycle.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
XXS 48.62 36.13 49.16 46.3 7.79 70.7 75
XS 50.12 37.13 51.02 47.96 9.04 71.8 74.5
S 52.52 38.13 52.69 50.44 11.56 71.8 74.5
M 54.92 39.12 54.35 52.99 13.67 73 74.5
L 57.32 40.12 56.01 55.48 16.18 73 74.5
XL 59.72 41.12 57.68 57.97 18.95 73 74.5
CANNONDALE Topstone Carbon Gravel

Source：www.cannondale.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
47 55.4 36.4 53.2 41 9.7 69.9 73.1
51 56.1 37.3 54.3 44.6 10.1 70.7 73.1
54 57.9 37.8 55.4 48.2 12.3 70.7 73.1
56 59.7 38.3 56.4 51.8 14.2 70.7 73.1
58 61.5 38.9 57.6 55.4 16.4 70.7 73.1
61 64.6 39.7 59.3 59 19.6 70.7 73.1
CANNONDALE Synapse Alloy Road

Source：www.cannondale.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
44 51 36.5 52.1 40 9.6 70.2 73
48 53 37.1 53.3 42.2 11.5 70.8 73
51 55 37.6 54.4 44.3 14 71 73
54 57 38.1 55.5 48 16 71.9 73
56 59 38.7 56.7 52 18.1 72 73
58 61 39.3 58 55 20.5 72 73
61 64 40.2 59.8 59 23.6 72 73
CANNONDALE SuperSix EVO Road

Source：www.cannondale.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
44 49.5 37.3 51 40 8.9 70.9 74.5
48 50.8 37.6 52.2 42.9 10.1 71.2 74
50 52 37.9 52.9 44.8 11.4 71.2 74
52 53.2 38.3 53.6 46.7 13 71.2 74
54 54.5 38.7 54.4 49 14.3 71.2 74
56 56.5 39.3 56 51 15.4 73 73.5
58 58.5 39.8 57.7 53.2 17.8 73 73
61 61.5 40.6 60 57 20.9 73 72.5
CERVÉLO Áspero-5 Gravel

Source：www.cervelo.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
48 50 36.9 51.6 — 7.5 70.6 74.1
51 52.5 37.7 53.1 — 9.9 71.1 73.6
54 55 38.6 55.2 — 12.2 71.6 73.1
56 57.5 39.5 57.4 — 14.8 71.6 72.6
58 60 40.4 59.1 — 17.7 71.6 72.6
61 62.5 41.3 60.7 — 20.3 71.6 72.6
CERVÉLO Caledonia-5 Road

Source：www.cervelo.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
48 50.5 36 50.2 — 8.95 70.5 74.5
51 53 36.9 52.2 — 11.03 71.5 74
54 55.5 37.8 54.3 — 13.63 72 73.5
56 58 38.7 56.5 — 16.26 72 73
58 60.5 39.6 58.1 — 19.15 72 73
61 63 40.5 59.8 — 21.78 72 73
CERVÉLO R5 Road

Source：www.cervelo.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
48 49.61 36.87 50.6 — 8.96 71 74.5
51 52.02 37.65 52.6 — 10.93 72 74
54 54.46 38.33 54.5 — 13.2 73 73.5
56 56.75 39.11 56.5 — 15.6 73 73
58 59.07 40.03 58.1 — 18.28 73 73
61 61.07 40.83 59.5 — 20.37 73 73
CERVÉLO S5 Road

Source：www.cervelo.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
48 49.6 36.7 52 — 6.4 71 73
51 51.9 37.6 53.5 — 8.2 72 73
54 54.2 38.4 55 — 10.4 73 73
56 56.5 39.2 56.5 — 12.5 73.5 73
58 58.8 40.1 58.1 — 15.2 73.5 73
61 60.8 40.9 59.5 — 17.3 73.5 73
BROMPTON G Line Folding

Source：be.brompton.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
Small — 47.7 — — — — —
Medium — 48.3 — — — — —
Large — 50.4 — — — — —
CANYON Aeroad CF SLX 7 Di2 Road

Source：www.canyon.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
2XS 49.8 37.2 52 44.1 8.8 70 73.5
S 53.9 39 54.9 50.1 12.1 72.8 73.5
M 56 39.3 55.9 53.1 14.2 73.25 73.5
XL 60.6 41.9 59.8 59.1 18.8 73.5 73.5
XS 52 37.8 53.2 47.1 10.7 71.2 73.5
L 58 40.1 57.2 56.1 16.2 73.3 73.5
2XL 62.4 42.9 61.3 62.1 20.6 73.8 73.5
CANYON Endurace CF 7 Road

Source：www.canyon.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
2XL 64.9 42.7 61.9 61.2 22.6 72.8 73.5
2XS 52.5 38.2 53.7 43.2 10.4 70.3 73.5
XS 54.5 38.6 54.7 46.2 12.3 71 73.5
S 56.3 39 55.7 49.2 13.9 71.8 73.5
M 58.4 39.2 56.5 52.2 15.8 72.5 73.5
L 60.5 40.1 58 55.2 18 72.5 73.5
XL 62.9 40.9 59.6 58.2 20.4 72.8 73.5
CANYON Ultimate CF 7 Road

Source：www.canyon.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
XL 60.6 41.9 59.4 57 18.8 73.5 73.5
2XL 62.4 42.9 61 60 20.6 73.8 73.5
2XS 49.8 37.2 51.6 42 11.5 70 73.9
XS 52 37.8 52.9 45 10.7 71.2 73.9
S 53.9 39 54.6 48 12.1 72.8 73.5
M 56 39.3 55.5 51 14.2 73.25 73.5
L 58 40.1 56.9 54 16.2 73.3 73.5
XDS X-LAB GT8 2026 Gravel

Source：www.xidesheng.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
XS 51.9 37 50.6 43.5 8 70 76
S 54 37.9 52.5 44.7 10 70 75
M 56.5 38.4 54.7 47.1 12 71 74
L 58.4 39.2 56.6 49.1 14 71 74
XL 60.7 39.9 58.5 53.2 16.5 71 73
XXL 63.1 40.8 60.5 57.7 19 71 73
XDS AD7 2026 Road

Source：www.xidesheng.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
XS 51 36.8 50.4 47 10.5 70.7 75.1
S 52.5 37.6 52.3 49.5 11.8 71.5 74.5
M 54 38.7 54 52 13 72.5 74
L 55.8 39.5 55.9 54 14.8 73 73.5
XL 58 40.5 57.9 56.5 17.1 73.2 73.2
XDS X-LAB AD8 Road

Source：www.xidesheng.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
XS 50.5 37.1 50.4 47 10.5 70.9 75.1
S 52 37.9 52.3 50.3 11.8 71.5 74.5
M 53.4 38.7 54 51.5 13 72.5 74
L 55.3 39.5 55.9 54.3 14.8 73 73.5
XL 58.7 40.5 57.9 56.8 17.1 73.2 73.2
XDS X-LAB AD9 Road

Source：www.xidesheng.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
XS 50.5 37.1 50.4 47 10.5 70.9 75.1
S 52 37.9 52.3 50.3 11.8 71.5 74.5
M 53.4 38.7 54 51.5 13 72.5 74
L 55.3 39.5 55.9 54.3 14.8 73 73.5
XL 58.7 40.5 57.9 56.8 17.1 73.2 73.2
GIANT Revolt Advanced SL 0 Gravel

Source：www.giant.com.cn Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
XS 52.5 38.9 53 43 9 70.5 75
S 53.6 39.1 54 45 10 71 74.5
M 55.7 39.5 55 47 12 71.5 74.5
ML 57.3 40.1 56.5 49 13.5 72 74
L 59.2 41 58 51 15.5 72 74
GIANT Propel Advanced SL 0-DA Road

Source：www.giant.com.cn Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
XS 51.5 37.7 52 68 11.5 71.5 74.5
S 53 38.3 53.5 71 12.7 72.5 74
M 54.6 38.8 55 74 14.5 73 73.5
ML 56.5 39.2 56.5 77 16.5 73 73
L 58.2 40.2 58 80 18.5 73 73
XL 59.6 41.2 60 83 20 73 72.5
GIANT TCR Advanced SL 0-DA Road

Source：www.giant.com.cn Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
XS 51.7 37.6 52 68 12 71 74.5
S 52.8 38.3 53.5 71 13 72.25 74
M 54.5 38.8 55 74 14.5 73 73.5
ML 56.2 39.3 56.5 77 16.5 73 73
L 58.1 40.2 58 80 18.5 73 73
PINARELLO Grevil F Gravel

Source：pinarello.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
470 55.32 36.84 53 47 11.5 70.25 74.5
500 56.83 37.61 54.5 50 13 70.5 74
530 58.32 38.37 55.8 53 15 70.75 73.75
550 59.84 39.04 57 55 16 71.75 73.5
575 61.36 39.82 58.7 57.5 17.5 72 73
600 63.37 40.69 60.7 60 19.5 72.25 72.5
PINARELLO Pinarello F Road

Source：pinarello.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
430 50.2 35.13 50 43 10.2 69.5 74.4
465 51.73 36.54 51.5 46.5 10.9 70.5 74.4
500 52.52 37.22 52.5 50 11.4 71.4 74
515 53.21 37.82 53.5 51.5 11.9 72 73.7
530 54.24 38.56 54.5 53 12.8 72.5 73.7
545 55.77 38.83 55.5 54.5 14.3 72.8 73.4
560 57.01 39.08 56.5 56 15.45 73.2 73
575 59.92 39.55 57.8 57.5 18.3 73.7 73
595 63.34 40.04 60 59.5 22.5 73.4 72.4
PINARELLO Dogma F Road

Source：pinarello.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
430 50.2 35.15 50 43 10.2 69.5 74.4
465 51.73 36.54 51.5 46.5 10.9 70.5 74.4
500 52.52 37.22 52.5 50 11.4 71.4 74
515 53.21 37.82 53.5 51.5 11.9 72 73.7
530 54.24 38.33 54.5 53 12.8 72.5 73.7
540 55.1 38.53 55 54 13.6 72.8 73.4
550 56.15 38.92 55.7 55 14.7 72.8 73.4
560 57.01 39.08 56.5 56 15.45 73.2 73
575 58.48 39.67 57.5 57.5 16.8 73.7 73
595 61.32 39.34 58.7 59.5 20.4 73.4 72.4
620 65.16 41 62 62 24.4 73.4 72
COLNAGO Y1Rs Road

Source：139650070.fs1.hubspotusercontent-eu1.net Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
XS 49.5 36.8 — — 8.85 70.8 75
S 52 37.7 — — 10.85 71.9 74.5
M 54 38.6 — — 12.65 73 74
L 56.5 39.5 — — 15.05 73.5 73.7
XL 59 40.4 — — 17.65 73.5 73
COLNAGO V4Rs Road

Source：139650070.fs1.hubspotusercontent-eu1.net Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
420 51 37 50.4 42 10.3 70.6 75.5
455 52.2 37.5 51.7 45.5 11.4 71 75
485 53.9 38.3 53.5 48.5 13 71.5 74.5
510 55.7 38.8 55 51 14.8 71.8 74
530 57.5 39.5 56.7 53 16.4 72.5 73.5
550 59.3 40.3 58.6 55 18.1 72.9 73
570 61.2 41 59.9 57 20 73.1 73
COLNAGO G4-X Gravel

Source：www.colnago.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
450 53.5 37.1 52.4 45 — 71 74
480 55.4 38 53.9 48 — 71.5 74
520 57.3 39 56 52 — 71.5 73.5
540 59.1 40 58.1 54 — 71.5 73
570 60 41 59.6 57 — 71.5 73
SPECIALIZED Crux 5 Gravel
Best race gravel bike (2026)

Source：www.specialized.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
49 53 37.5 51.2 44.5 9.5 70.5 75.5
52 54.7 38.2 53.4 45.6 11 70.75 74.5
54 56 38.8 54.3 47.3 12.5 71 74.5
56 57.8 40 56.6 49.7 14.2 71.5 74
58 59.8 41.2 58.3 51.5 16.3 71.5 74
61 62.1 42.5 60.3 54.5 18.8 71.5 74
SPECIALIZED Diverge 4 Gravel

Source：www.specialized.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
49 56.3 36.5 52.1 40 9 70 74.5
52 57.8 37.4 53.7 43 10.4 70.5 74
54 59.2 38.7 55.6 47 11.6 71 74
56 61 40 57.5 50 13.5 71 74
58 63.4 41.2 59.3 53 16.1 71 74
61 65.9 42.5 61.3 56 18.7 71 74
SPECIALIZED Allez Road

Source：www.specialized.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
44 51.9 35.6 49.3 43 11 69.5 75.25
49 53.6 35.9 50 46 12.5 70.5 75.25
52 55.2 36.4 53 49 14 71 73.25
54 56.9 37 54.1 51 15.5 72 73.25
56 59 37.8 55.6 53 17.5 72.5 73.25
58 61 38.6 56.9 55 19.5 73 73.25
61 64.3 39.2 58.6 58 23 73 73.25
SPECIALIZED Tarmac SL8 Road

Source：www.specialized.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
44 50.1 36.6 49.6 43.3 9.9 70.5 75.5
49 51.4 37.5 50.9 44.5 10.9 71.75 75.5
52 52.7 38 53.1 45.6 12 72.5 74
54 54.4 38.4 54.1 47.3 13.7 73 74
56 56.5 39.5 56.3 49.4 15.7 73.5 73.5
58 59.1 40.2 57.7 51.5 18.4 73.5 73.5
61 61.2 40.8 59.5 54.5 20.4 74 73
TREK Émonda ALR Road

Source：www.trekbikes.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
50 52.1 37.8 52.1 45.3 11.1 72.1 74.6
52 53.3 38.3 53.4 48.3 12.1 72.8 74.2
54 54.1 38.6 54.3 49.6 13.1 73 73.7
56 56.3 39.1 55.9 52.5 15.1 73.5 73.3
58 58.1 39.6 57.4 55.3 17.1 73.8 73
60 60.1 39.9 58.6 57.3 19.1 73.9 72.8
62 62 40.3 59.8 59.3 21.1 73.9 72.5
TREK Checkpoint SL Gravel

Source：www.trekbikes.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
XS 53.5 38 53.6 44.5 8.6 71 74
S 55.6 38.6 54.7 48 10.6 71.4 74
M 57.9 39.1 56.6 50.5 13 71.6 73.3
ML 60.1 39.7 57.8 53 15.1 72 73.3
L 62 40.2 58.9 55 17.1 72.1 73.3
XL 64 40.8 60.1 57.5 19.1 72.4 73.3
TREK Domane SLR Road

Source：www.trekbikes.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
XS 52.4 36.8 52 44.4 10.6 71.3 73.5
S 55.5 37.1 53 47.6 13.9 71.1 73.7
M 57.5 37.4 54.1 50 15.9 71.2 73.5
ML 59.6 37.7 55.3 53.3 17 71.9 73.3
L 61.8 38 56.2 55.3 19.2 72 73.3
XL 64.8 38.4 57.5 59.3 22.6 72.1 73.3
TREK Madone SLR Road

Source：www.trekbikes.com Collected 2026-09-27

Size Stack Reach Top tube Seat tube Head tube Head angle Seat angle
XS 50.7 37 51.7 40.4 10 71.6 73.8
S 53 37.8 53.2 44 12.1 72.2 73.8
M 54.6 38.4 54.5 47.6 13.6 72.9 73.6
ML 56.2 38.9 55.7 51.2 15 73.5 73.4
L 58.2 39.4 56.8 54.8 17.2 73.8 73.4
XL 61 40.2 58.4 60.9 20.1 73.9 73.4

Open API · Coming Soon

We are packaging this data into a self-serve, read-only API for developers working on bike-model matching, body profiling and regional trend analysis.

Sample response

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