Amflow Geometry, Sizing & Fit Guide: PX, PR and PL Compared
The latest Amflow PX and Amflow PR bikes are not locked into one fixed setup. Both platforms include adjustable geometry hardware, allowing riders to fine-tune handling, stability and ride feel.
This guide explains how the Amflow geometry system works, how PX and PR compare, what size to choose, and how the newer bikes have evolved from the original Amflow PL.
Amflow geometry adjustment parts: headset cups and flip-chip hardware.
40 Adjustable Geometry Configurations
Amflow states that the PX and PR offer up to 40 adjustable geometry configurations. This is achieved by combining:
5 headset angle settings
2 bottom bracket height settings
4 chainstay length settings
The bikes come supplied with the geometry adjustment hardware, including 0.5° / 1° headset cups and the required flip-chip parts.
The Geometry Adjustment System
All four current PX and PR models use three independent adjustment systems, giving up to 40 possible geometry combinations.
Head angle: 5 positions using headset cups
Bottom bracket height: 2 positions
Chainstay length: 4 positions
Head Angle Range
PX: 63.2° / 63.7° / 64.2° stock / 64.7° / 65.2°
PR: 63.5° / 64.0° / 64.5° stock / 65.0° / 65.5°
A slacker head angle gives more descending stability, while a steeper setting makes the bike feel quicker and more responsive on tighter trails.
Chainstay Length
PX: 438mm to 451mm
PR: 440mm to 452mm
Shorter stays make the bike easier to move around and more playful. Longer stays improve stability and confidence at speed.
Bottom Bracket Height
PX: 345mm / 349mm
PR: 349mm / 353mm
A lower bottom bracket gives a more planted cornering feel, while a higher setting improves pedal clearance on rough or rocky terrain.
Flip-chip adjustment allows the bike to be tuned for different riding styles.
Size L Geometry Snapshot: PX vs PR
Looking at a Size L gives a useful snapshot of how the PX and PR platforms differ.
Spec
PX Carbon / Pro
PR Carbon
Head Angle Stock
64.2°
64.5°
Head Angle Range
63.2° - 65.2°
63.5° - 65.5°
Actual Seat Angle
72°
70°
Effective Seat Angle
78°
76.9°
Reach
478mm
475mm
Stack
632.2mm
637mm
BB Height
345.5mm
353.1mm
BB Height Range
345 / 349mm
349 / 353mm
Chainstay Range
438 - 451mm
440 - 452mm
Fork Length
570mm
585mm
Fork Travel
160mm
160mm
Rear Travel
150mm
150mm
What the Numbers Actually Mean
The PX is the more performance-focused geometry. It has a slightly slacker stock head angle, a noticeably steeper effective seat angle and a lower bottom bracket compared with the PR.
That steeper seat angle helps put the rider further over the pedals, which can improve climbing position and efficiency on longer or steeper climbs.
The PR has a slightly taller front end and higher bottom bracket, giving it a more traditional enduro feel with extra ground clearance and a planted, stable character.
Both platforms have 160mm fork travel and 150mm rear travel, so the difference in ride feel comes mainly from frame layout, battery platform and geometry.
Important Wheel Size Note
Both PX and PR frames are compatible with 27.5-inch and 29-inch rear wheels. The standard geometry figures are based on the factory mullet setup with a 27.5-inch rear wheel. Running a 29-inch rear wheel will change the geometry and ride feel, generally raising the rear of the bike and altering the effective angles.
Official Amflow Size Guide
Size
Height (cm)
Height
M
162 - 178cm
5'4" - 5'10"
L
170 - 185cm
5'7" - 6'1"
XL
175 - 191cm
5'9" - 6'3"
XXL
185 - 201cm
6'1" - 6'7"
Our Real-World Sizing Advice
The official size guide is useful, but we strongly recommend contacting the shop for advice before choosing a size.
In our experience, the Amflow PX and PR can feel slightly smaller than some riders expect, especially near the upper end of each size range.
Choose smaller if you prefer a playful, compact feel
Choose larger if you want more stability and a roomier cockpit
If you are between sizes, reach and riding style matter more than height alone
Need sizing help?
If you are unsure which Amflow size to choose, contact Cookson Cycles before ordering. We can help you choose the right frame size based on height, riding style and preferred fit.
How PX and PR Compare to the Original PL
The original Amflow PL was already a modern lightweight full-power e-MTB, but the newer PX and PR platforms move the fit and geometry forward.
One of the biggest improvements is the shorter seat tube on the newer bikes. This gives riders more room for longer dropper posts, which is a major advantage on steep and technical trails.
PR: shorter seat tubes than PL, adjustable chainstay and removable battery platform
For riders coming from the original PL, the PX is the more direct evolution of the lightweight, high-performance concept. The PR adds a new lower price point with removable battery practicality and a different ride character.
Suggested Setup Ideas
Riding Style
Suggested Direction
Bike park / steep descending
Slacker headset setting, longer chainstay, lower BB where suitable
Technical UK trails
Neutral headset, short or middle chainstay setting
Tight woodland trails
Steeper headset setting, shorter chainstay for agility
Long climbs / all-day rides
Neutral setup with chainstay adjusted for traction and comfort
Geometry setup is personal, and small changes can noticeably affect how the bike rides. If you buy your Amflow from Cookson Cycles, we can help advise on the best starting setup.
Final Thoughts
The Amflow PX and PR geometry systems are a major part of what makes these bikes so versatile. Instead of being locked into one setup, riders can fine-tune the bike for stability, agility, climbing position or descending confidence.
The PX is the sharper, more performance-led platform, while the PR offers excellent value and practicality with a removable battery. Both benefit from modern geometry, mullet compatibility and useful adjustment.
