Geometron Bikes on the Design & Development of the New G1 (Ep.230)

David Golay reviews the 2025 Geometron G1 for Blister
2025 Geometron G1 (photo: Gee Milner)

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Geometron arguably did more than any other bike brand to kick off the geometry revolution of the late 2010s, but they weren’t content to leave their longstanding G1 alone — even though its geometry still looks pretty up to date five years after it first launched. So we sat down with Sam Robson and Marcel Lauxtermann from Geometron to talk about the development of the new G1, their goals for the updated bike, the testing that informed the updates they made, and a whole lot more.

TOPICS & TIMES:

Introducing Sam and Marcel (3:29)
Updating the G1 (6:32)
Refining geometry (9:04)
“Loading patterns” and bike setup for customers (13:57)
The new G1 (18:11)
David’s bike setup preferences (25:52)
Headtube angles and front wheel loading (30:47)
Stem lengths and steering feel (37:29)
Bottom bracket drop and geometry adjustability (41:31)
Other updates (43:25)
Suspension kinematics (47:39)
Sam & Marcel’s personal bike setups (51:42)

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2 comments on “Geometron Bikes on the Design & Development of the New G1 (Ep.230)”

  1. Listening to this now. Just got to the point where they are talking about proportional scaling of the bike across sizes.
    Their statements mirror exactly my experience and my efforts to modify my bike.
    I am tall, but mostly in my legs, not my torso.

    What they call “real reach” I have been calculating for a while now, calling it “corrected reach” to compare how long the reach is once I set my handlebars to my preferred height.

    And similar to what they did with head angle adjustments, I set my Stumpy Evo in a steeper head angle setting, but I swapped my CSU for a 27.5 version, to get the shorter, 37mm offset on my 29er fork.
    This brings in the front center a tiny bit on its own, but more importantly, let’s met run a steeper head while maintaining sufficient fork trail.
    Combined, this significantly reduces front center, bringing my hands closer to my front contact patch, and creating a more normal front:rear weight balance.

  2. Stem Length – I’m with Paul Aston / Rulezman on this one in that 0mm effective stem length is the way to go. Hence my 31mm stems with 12 degree backsweep bars rolled back to align centre of grips to centre of steerer.

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