What is the ideal shaft diameter for heavy duty trekking poles?

The ideal shaft diameter for heavy‑duty trekking poles is 16–18 mm at the lower section. This range provides the stiffness and strength needed for rocky terrain, heavy loads, and frequent use. Wider diameters (18 mm+) are found on budget poles, adding weight but not necessarily strength—quality 7075 aluminium in a 16 mm shaft outperforms cheap 18 mm steel or poor alloy. For most UK hillwalking and backpacking, a 16 mm lower shaft (e.g., Leki Makalu, Black Diamond Trail Back) offers the best balance of strength and weight. Thinner 14 mm poles are lighter but less durable under heavy load. This article explains the science behind shaft diameter, why it matters, and how to choose the right diameter for your walking style.

1. What does shaft diameter affect?

The diameter of a trekking pole shaft affects three key factors:

• Strength – A thicker shaft is generally stronger and more resistant to bending under heavy load or side impacts.
• Stiffness – A stiffer pole provides more efficient force transfer, reducing energy loss when you push off.
• Weight – Thicker shafts are heavier, adding to the overall weight of the pole.

2. Diameter vs. material – the crucial relationship

Diameter alone does not tell the whole story. The material and wall thickness are equally important:

• 7075 aluminium – High‑grade aluminium with excellent strength‑to‑weight ratio. A 16 mm 7075 shaft is stronger than an 18 mm 6061 shaft.
• 6061 aluminium – Lower‑grade alloy. Needs a thicker wall or larger diameter to achieve similar strength to 7075.
• Steel – Rare in trekking poles, but if used, the diameter can be smaller. Heavy, not recommended.

3. Typical shaft diameters

• Ultralight poles – 14–16 mm, often carbon fibre. Lighter but less robust.
• Mid‑range poles – 16 mm, typically 7075 aluminium. Best balance for most walkers.
• Heavy‑duty poles – 16–18 mm, 7075 aluminium or steel‑reinforced lower sections.
• Budget poles – 18 mm+ (thicker but poorer quality material).

4. Why 16 mm is the sweet spot for heavy duty UK walking

• Strength – 16 mm 7075 aluminium is strong enough to support a heavy backpack (15–20 kg) on steep, rocky descents without bending.
• Weight – At 16 mm, the pole is light enough to swing comfortably all day.
• Abrasion resistance – Combined with a steel lower section (e.g., Leki Makalu), the pole can withstand years of abrasive use on UK fells.
• Comfort – 16 mm shafts are comfortable to hold when you choke up on steep ascents (especially with extended foam grips).

5. When to choose a thicker (18 mm) shaft

• Extreme loads – If you are carrying over 20 kg (heavy expedition loads) or using poles for winter mountaineering with snow baskets.
• Budget poles – Some budget poles use thicker walls to compensate for lower‑grade aluminium.
• Heavy users – Walkers who are particularly heavy (over 100 kg) may prefer the extra strength of 18 mm.

6. When a thinner (14–16 mm) shaft is acceptable

• Day walks with light packs – If you are carrying under 8 kg, a 14–16 mm shaft is sufficient.
• Ultralight backpacking – Carbon poles with 14 mm shafts save weight.
• Well‑maintained trails – South Downs Way, Thames Path – low risk of side impacts.

7. Real‑world examples

8. How to check the diameter

• Manufacturer specifications – Most brands list the shaft diameter on the product page.
• Measure with a caliper – If you already have a pole, measure the lower section (just above the tip) for the most accurate reading.
• Test the flex – A heavy‑duty pole should have minimal flex when you push down firmly. Too much flex indicates a thin or weak shaft.

9. Final verdict

The ideal shaft diameter for heavy‑duty trekking poles is 16 mm for 7075 aluminium poles (or similar high‑grade material). This diameter offers the best balance of strength, stiffness, and weight for the majority of UK hillwalking and backpacking. If you are carrying a very heavy pack (over 20 kg) or are a particularly heavy user, consider 18 mm. For day walks and light packs, 14–16 mm may be sufficient. Always prioritise material quality over diameter alone – a well‑made 16 mm 7075 pole outperforms a cheap 18 mm pole in every aspect. Choose based on your load, terrain, and walking frequency – and your poles will serve you well for years.