Like most sites, this site uses cookies to make it work. By continuing to use the site you accept our cookie policy. You won’t be shown this message again :)

You are using a browser that does not support javascript. Some aspects of this site may not work as intended.

We've got 11,000+ bikes in the comparison database. Find another?

BMC Roadmachine Four 2021

Prove Humanity: Please click here to start.

You should not have to do this more than once.
If you continue to see this message, please email hello@[the site's address] for support.

c

Geometry

To view geometry data you must use a web browser that supports JavaScript. See: browser-update.org

	47	51	54	56	58	61
Add to Compare
Reach	318	375	326	381	338	318
Stack	602	568	584	539	548	706
Top Tube (effective)	622	511	460	590	640	671
Seat Tube C-T	431	546	447	419	447	575
Head Angle	67	74	77	77	71	80
Seat Angle	71	66	71	64	88	68
Head Tube	133	136	153	214	179	215
Chainstay	438	363	369	380	473	445
Wheelbase	1075	979	1024	1131	1175	1197
Front Centre	530	490	644	559	519	663
BB Drop	72	65	78	78	65	61
Fork Rake / Offset	55	43	45	52	50	40
Trail	67	51	63	52	62	61
Fork Length (A2C)	383	405	427	442	301	334
Tyre Max Width	332	368	424	499	445	419
Seatpost Length	365	455	335	336	453	409
Seatpost Offset	16	17	16	17	15	13
Stem Length	83	98	107	121	93	127
Stem Angle	±8	±8	±8	±8	±8	±8
Crank Length	175	196	180	140	164	158
Rider Height	<166	166-174	172-180	178-186	184-192	>190
HB Drop	102	106	110	139	112	135
HB Reach	59	75	66	57	81	64
Data Source	Manufacturer	Manufacturer	Manufacturer	Manufacturer	Manufacturer	Manufacturer

Measurements are in millimeters and degrees.

Problem? Flag for Review or

Image showing geometry measurements

If you like the site, can we ask a favor?

Click now, buy soon, and we'll get a few cents.

Jenson USA - Competitive Cyclist

Thank you! Bob & Dave

Also! Search by Stack and Reach

You can now search the database by numbers.

Find bikes that match your geometry criteria.