Intense Primer Geometry: Reading the 2026 Size Chart
Intense Primer geometry changes substantially with frame size even though several angles remain the same. The 2026 manual lists reach from 427 mm in small to 507 mm in extra large, alongside increasing stack and wheelbase. Those are useful comparisons for a rider considering this generation, but the table supplies no rider-height chart and cannot establish a personal fit by itself.
Intense Primer geometry across four sizes
For small, medium, large and extra large respectively, reach is 427, 456, 483 and 507 mm. Stack is 568, 597, 626 and 656 mm. Reading those two rows together shows how the frame’s reference position changes horizontally and vertically. Compare both with a bicycle whose fit you already understand, while allowing for differences in its cockpit and suspension.
Wheelbase progresses through 1188, 1217, 1247 and 1279 mm. Chainstay length remains 440 mm throughout the chart. The larger frame is therefore not simply the small frame with a taller seat tube. These measurements help explain the physical differences between sizes without predicting exactly how any rider will experience handling.
Keep the chart’s assumptions attached
The printed geometry is based on a fork with 565 mm axle-to-crown length and 44 mm offset, and a tire outside diameter of 750 mm. Those are calculation assumptions accompanying this table. They should not be treated as approval for every fork or tire sharing one dimension. Page 6 separately sets maximum front travel at 150 mm.
All four sizes list a 65.6-degree head angle, 77-degree effective seat angle and 73-degree actual seat angle. Keep the two seat-angle labels separate when comparing another chart. Copying the effective angle beside another bicycle’s actual angle creates an inaccurate comparison even when both numbers came from genuine manufacturer documents.
Turn measurements into a fit discussion
The seat tubes measure 405, 420, 440 and 465 mm across the four sizes. Maximum seatpost insertion is a separate row: 255 mm for small and medium, 280 mm for large and extra large. Neither number is a dropper-travel recommendation. A suitable seated position still depends on the actual post, saddle and rider.
Begin a size comparison with the complete 2026 chart and your existing bicycle’s measurements. Then assess the proposed cockpit and saddle position with a competent fitter or dealer. This avoids presenting reach alone as a universal size rule, or importing a recommendation from a different Primer generation simply because the model name matches.
For the surrounding model families, the Intense topic and brand introduction provide context. Apply the measurements here specifically to the identified 2026 Primer.
FAQ
What is the medium 2026 Primer’s reach?
The manual lists 456 mm of reach for the medium frame.
Does every size have the same wheelbase?
No. The listed wheelbases increase from 1188 mm to 1279 mm across the four sizes.
Is the effective seat angle the actual seat angle?
No. The chart labels them separately at 77 degrees and 73 degrees respectively.
Sources
Model-specific reference: printed pages 6, 7 of the 2026 Primer frame manual (https://cdn.shopify.com/s/files/1/2426/4557/files/2026_Primer_Frame_Manual.pdf?v=1775683549), retrieved 28 October 2026.
Photograph credits and permissions
Photograph 1
Original title: Intense M6.JPG
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Copyright notice: Copyright 2006
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