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

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

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

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

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

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

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

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

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

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

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

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.

GET /api/public/statsGlobal / per-region record counts and coverage
GET /api/public/distributionHeight, frame size and other distribution histograms
GET /api/public/ratiosEthnic-group body ratios and averages

Sample response

Apply for access: Andata