Eddy Merckx 525R Geometry: Read Reach, Stack and Seat Angle by Size
Eddy Merckx 525R geometry uses a size-dependent seat-tube angle alongside a new reach-and-stack arrangement. In the current chart, Medium is listed at 413 mm reach and 569 mm stack, with a 75-degree seat-tube angle. Those figures describe an identified frame size, rather than every bicycle carrying the 525 name or a finished position for every rider.
Eddy Merckx 525R geometry: compare the same columns
The chart lists reach and stack as 377/535 mm for XS, 398/550 mm for S, 413/569 mm for M and 437/593 mm for L. Keep each pair with its size. Comparing a Small reach with a Medium stack would create a position reference that the manufacturer has not actually published.
The seat-angle row also changes: 74.5 degrees for XS, 75 for S and M, and 76 for L. The official presentation identifies that progression as an intentional design feature. It should not be flattened into a universal 75-degree specification or used to infer a rider’s final saddle position without the actual seatpost and saddle arrangement.
Keep the current frame distinct from the previous 525
The 525R FAQ explicitly compares its Medium seat angle with a 73-degree entry on the previous-generation 525. That is a useful generation distinction. Its final top-tube explanation unexpectedly refers to a previous Noah, however. This guide does not use that wording to establish a verified top-tube equivalence with a Ridley model.
Match a used bicycle to the exact frame record before copying current geometry into a comparison. The older rim-brake Merckx shown in the photograph is historical brand context. Its shape, component labels or apparent saddle height cannot establish the dimensions of the current disc-brake 525R.
A frame chart is the start of a fitting conversation
Write down the contact-point position you want to retain or change, then compare the relevant size with your present bicycle. Stem length, handlebar shape, saddle placement and permitted adjustment also matter. The manufacturer’s description of an efficient riding position is its design explanation, not an independent fit assessment carried out here.
Have the complete proposed setup checked before selecting a size or transferring parts. A familiar letter on two frames is not enough to show that they place you similarly. The Eddy Merckx topic groups the current model questions, while the brand introduction explains the wider road and all-road range.
FAQ
What reach and stack does Medium list?
The current 525R chart gives 413 mm reach and 569 mm stack.
Is the seat angle identical in every size?
No. The printed row changes from 74.5 degrees in XS to 76 degrees in L.
Does the historical photograph verify this chart?
No. It shows an older rim-brake Merckx, not the current 525R frame.
Sources
Official published model content and dated manufacturer news checked 30 October 2026:
Current 525R (https://www.eddymerckx.com/en_GB/bikes/platform/525/525R).
525R Frame En (https://www.eddymerckx.com/en_BE/bikes/FFS52REMC003).
Photograph credits and permissions
Photograph 1
Original title: Eddy Merckx 525 Ultegra Di2 (14199825490).jpg
Creator: Glory Cycles; creator URI: https://www.flickr.com/people/29558127@N06; embedded Artist tag: Picasa
Original source URI: https://commons.wikimedia.org/wiki/File:Eddy_Merckx_525_Ultegra_Di2_(14199825490).jpg
License / permission: CC BY 2.0
License / permission URI: https://creativecommons.org/licenses/by/2.0/
Modification notice: Wikimedia Commons-provided 1280×848 JPEG rendition of the 4928×3264 original. No further crop, retouching, re-encoding or metadata editing by this publisher. Photograph remains under CC BY 2.0.