Ridley Nimbus Aero Cockpit: Stem Stack, Reach and Two Handlebar Widths
Ridley Nimbus Aero cockpit measurements describe more than stem length. In the Noah Fast 3.0 support material, Ridley defines stem reach and stem stack separately, offers three stem-stack options, and lists different handlebar widths at the shifters and in the drops. These distinctions matter when comparing a position or discussing an alternative cockpit specification.
Ridley Nimbus Aero cockpit stem reach and stem stack
Stem reach is the horizontal distance added from the center of the steerer to the center of the handlebar. Stem stack is the cockpit’s contribution above the frame stack. These are component definitions, so the cockpit number should not be mistaken for the frame’s own geometry measurement.
They also describe reference points rather than the rider’s complete hand position. The manufacturer’s definitions do not by themselves provide a fit result for an individual. Use the same reference points when presenting current and proposed arrangements to the person assessing the position.
Three stack options and a separate spacer allowance
Ridley lists 55, 75 and 100 mm stem-stack options. Its support entry says the stock arrangement uses 75 mm, with other options selectable in the configurator. This is the manufacturer’s described setup, not a statement about the equipment fitted to every used example or current dealer bicycle.
The same page allows a further 20 mm of spacers beneath the cockpit for fine adjustment. That allowance should not be replaced by a spacer limit from another Ridley cockpit. It is also distinct from selecting a different stem-stack option; the numbers have different roles in the position comparison.
Width at the shifters is not width in the drops
The Noah Fast 3.0 cockpit FAQ gives 360 mm center-to-center at the shifters and 400 mm center-to-center in the drops. Reporting this simply as a 40 cm bar hides where the narrower measurement is taken. Keep the location and center-to-center basis attached to both figures.
Ask for the exact cockpit option and its dimensions when discussing a complete bicycle. The pages reviewed here do not establish an installation torque sequence or show how to swap the cockpit. The historical X-Bow photo has a different handlebar arrangement and cannot demonstrate Nimbus dimensions or a Noah Fast fit. For model context alongside these component definitions, the Ridley introduction outlines the road and gravel families.
FAQ
Are the 55, 75 and 100 mm values frame-stack figures?
No. They are Ridley’s listed stem-stack options for the cockpit.
Where is the stated 360 mm width measured?
The cockpit FAQ measures it center-to-center at the shifters.
Does the reviewed support page permit unlimited spacers?
No. It describes an additional 20 mm beneath the cockpit.
Sources
Manufacturer records for Ridley Nimbus Aero cockpit: Manufacturer support directory and model grouping (https://www.ridley-bikes.com/en_US/support/folders/63000157885). Noah Fast 3.0 cockpit FAQ (https://www.ridley-bikes.com/en_US/support/folders/63000157885/article/63000285397). Nimbus Aero dimension definitions (https://www.ridley-bikes.com/en_US/support/folders/63000157885/article/63000286139). Retrieved 28 October 2026. The historical photograph is credited separately above and below.
Photograph credits and permissions
Photograph 1
Original title: Ridley.jpg
Creator: Pinguinsen
Original source URI: https://commons.wikimedia.org/wiki/File:Ridley.jpg
License / permission: CC BY-SA 4.0
License / permission URI: https://creativecommons.org/licenses/by-sa/4.0/
Modification notice: Original 800×600 JPEG used without cropping, retouching or re-encoding by this publisher. Photograph remains under CC BY-SA 4.0.