Thesis OB1 2026 Geometry, Reviews, and Specs

No OEM studio shot for this model yet.

Fit and steering

Aggressive fitSlow steeringFast steeringRelaxed fit

Weight—

Climbing4.9

Aero3.3

Comfort5.1

Size	Stack	Reach	Stack/reach	Stem	Bar	Crank	Head tube angle	Seat tube angle	Chainstay	Wheelbase	BB drop	Wheel size
XS	540 mm	378 mm	1.43:1	80 mm	380 mm	165 mm	70.5°	74.0°	425 mm	1018 mm	75 mm	700c
S	558 mm	386 mm	1.45:1	90 mm	400 mm	170 mm	71.0°	73.5°	425 mm	1028 mm	75 mm	700c
M	576 mm	394 mm	1.46:1	100 mm	420 mm	172.5 mm	71.5°	73.5°	425 mm	1040 mm	73 mm	700c
L	594 mm	402 mm	1.48:1	110 mm	440 mm	175 mm	72.0°	73.0°	425 mm	1052 mm	73 mm	700c
XL	612 mm	410 mm

No colorway catalog for 2026 yet.

Same published geometry as 2025.

Published geometry matches the 2025 Thesis OB1. Same sizes, same stack and reach.

No verified spec sheet for 2026 or 2025.

No launch MSRP in the catalog yet.