Measured data

The four data blocks on the homepage are expanded here into item-by-item detail: ultimate tensile, 48-hour tension holding, biphasic braid stiffness, controlled specs and operating limits.
Every figure carries its source section, so you can go back to the exact paragraph in the whitepaper (or the build guide).

01

Every spoke in the laboratory

Destructive tensile testing on a dual-column machine, 120 kgf held for 48 hours, 180 kgf full inspection and >300 kgf sampling — 12 factory inspection items recorded one by one. We break them so that every remaining one can be predicted.

332.5kg Mean ultimate tensile · 10–12% above target Source: /en/whitepaper/ §5.1

2.37× / 4.15× Wheel-building tension / daily-riding safety factor Source: /en/whitepaper/ §5.1

0.46% / 0.02 mm Total 48h tension decay / permanent creep Source: /en/whitepaper/ §5.2

12items Factory inspection · full + sampling Source: /en/whitepaper/ §7.1

Measured Terragor PBO braided-spoke wheelset — Measured product · carbon rim + PBO braided spokes

02

One spoke, two characters

At low tension the braided geometry is soft, absorbing and filtering vibration; at high tension the fibres straighten and stiffness approaches carbon fibre. Compliant at cruise, rigid at sprint — with no switch to flip.

25–45 GPa Braided-geometry zone

Low tension absorbs and filters vibration; the ride feels more planted.

Source: /en/whitepaper/ §1.5

280 GPa Fibre-bearing zone

High tension delivers stiffness directly, with no lag.

Source: /en/whitepaper/ §1.5

Close-up of PBO spoke braid texture and metal end — Product close-up · braid texture and metal end

03

Controlled specs and compatibility limits

Every dimension leaves the factory within controlled tolerance. When replacing a steel spoke, convert the length as L_PBO = L_steel − 2 mm.

Standard overall length: 266 mm (including metal end)
Source: /en/whitepaper/ §5.1
Length tolerance: ±0.2 mm
Source: /en/whitepaper/ §5.3
Diameter tolerance: ±0.03 mm
Source: /en/whitepaper/ §5.3
Thread spec: M2.3 × 0.45
Source: /en/whitepaper/ §5.3
Steel → PBO conversion: L_PBO = L_steel − 2 mm
Source: /en/build-guide/ §1.2

Drive-side flange PCD38–42 mm, lower bending moment keeps aluminium hubs in their long-life zone · Source: /en/whitepaper/ §6.3
Flange root thickness≥ 6 mm, for root strength and fatigue resistance · Source: /en/build-guide/ §2.1
Large-flange hubsPCD ≥ 45 mm prohibited; bending moment exceeds the limit · Source: /en/whitepaper/ §6.4
Lacing1:1 symmetric; 2:1 not recommended — non-drive-side slack risk · Source: /en/whitepaper/ §3.2
RimsCarbon fibre, aluminium and tubular rims are all compatible; ERD must be measured to match · Source: /en/build-guide/ §2.3
Offset rimsUse with care; left and right spoke lengths must be recalculated · Source: /en/build-guide/ §2.3

04

What you must not do

PBO's strength comes from highly oriented continuous chains. Any operation that breaks continuity makes the strength drop irreversibly — building it takes a whole production line, ruining it takes one action. The four rules below are hard constraints.

No large-flange hubs (PCD ≥ 45 mm)Bending moment exceeds the limit; hub flanges may fatigue-crack · Source: /en/whitepaper/ §6.4
Never read PBO tension with a steel-spoke tableDeviation can reach 50–100%; the dedicated table is required · Source: /en/whitepaper/ §5.4
Never bend or cut the braided fibreIrreversible fibre damage and loss of strength · Source: /en/whitepaper/ §6.4
Never exceed 300 kgf tensionMeasured breaking load is 330–335 kgf; keep the safety margin · Source: /en/whitepaper/ §6.4

UV protection: the PTFE layer is fully UV-opaque; factory UV ageing retains ≥ 90% strength, outdoor service life > 20 years. Never strip the protective layer · Source: /en/whitepaper/ §5.6.4

Beyond the numbers, the source documents

The whitepaper carries the test conditions and derivations; the build guide carries the wheel-building parameters and compatibility limits; the wheelset catalog lists PBO replacement lengths by brand.

Read the whitepaper Read the build guide Browse the wheelset catalog

TERRAGOR.

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