Tyre size is only one part of an inner tube specification. A tube with the correct nominal diameter can still be unsuitable when its valve does not match the rim hole, required angle or accessible position. For wholesale orders, valve verification should therefore be completed as a separate step on every buying-list row.
The four checks behind a usable valve specification
Why the tyre size does not determine the valve
A tyre marking describes the tyre and rim-diameter family; it does not fully describe the inflation hardware. Different markets, rims and applications can use different valve configurations for a similar nominal tube size. The existing tube may also have been replaced previously, so copying an old valve without checking the rim can repeat an earlier mistake.
The safest purchasing record combines the complete tyre marking, rim information, intended application and required valve. JABIL's Tube Finder and individual product records show catalogue references where available, but those references remain subject to final order confirmation.
Start with the code, then verify the physical details
When a code such as TR4, TR13, TR15 or an angled metal-valve reference is visible, photograph it before removing the tube. Do not stop at the code: confirm the stem construction, approximate length, base, angle and the way it sits through the rim. A code typed from memory is weaker evidence than a clear image linked to the correct tyre and wheel.
TR13 and TR15 illustrate why the rim matters. Both are straight rubber-covered valves, but they correspond to different nominal rim-hole sizes. They should not be treated as interchangeable just because their external appearance is similar. Motorcycle ranges commonly use TR4, while agricultural orders may require an air-water arrangement such as TR218A. Commercial and large-equipment wheels can require bent metal valves for access.
Photographs to send when the code is unknown
Provide one close photograph of the entire valve, one showing the valve base and rim hole, and one wider image showing its position on the wheel. Add a ruler or calliper where dimensions are requested. Photograph the tyre and rim markings separately so the sales and technical teams do not have to infer which assembly the valve belongs to.
For bent valves, show the direction of the bend and the accessible inflation position after the wheel is mounted. For an agricultural wheel, state whether liquid ballast is used. For split-rim, truck, bus, OTR or industrial assemblies, include the wheel type and any flap requirement.
Build a quote-ready buying list
Use separate columns for application, tyre size, rim, valve code, valve notes, rubber material, quantity, packing and destination. Keep one size and valve combination per row. If two valves are being evaluated for the same size, create two clearly labelled rows rather than placing both codes in one cell.
Use “unknown—photos attached” instead of guessing. This tells the supplier that technical review is required before quotation or production. It also creates a traceable decision point when the final specification is recorded in the quotation and sales contract.
Application-specific reminders
Motorcycle and light vehicles: confirm straight-valve type, rim hole and front or rear wheel context. Truck and bus: record the valve angle and access position, plus any matching flap. Agricultural and tractor: separate front, rear and implement uses and identify any air-water requirement. OTR, forklift and industrial: include the machine, rim arrangement and clear orientation photographs.
A final pre-order checklist
- Copy the complete tyre marking.Preserve decimals, slashes and construction letters.
- Record the rim.Include rim-hole and wheel information available from the assembly.
- Capture the valve.Provide code, type, length, angle and photographs.
- State the application.Identify vehicle or equipment type and wheel position.
- Complete the commercial data.Add material, quantity, destination and packing requirements.
Prepare your enquiry
Send the size, valve evidence and buying list.
JABIL can review the available catalogue data against your stated technical and commercial requirements.
Frequently asked questions
Can an inner tube be ordered from tyre size alone?
No. The complete tyre marking, rim and valve arrangement should be confirmed because the same nominal size can appear with different valve requirements.
What should I send when the valve code is unknown?
Send clear photographs of the complete valve, its base, the rim hole and the mounted access position, together with measurements and the tyre and rim markings.
Are TR13 and TR15 interchangeable?
No. They are associated with different nominal rim-hole diameters, so the wheel specification must be checked before selection.
Why does valve angle matter?
On truck, bus, OTR and industrial wheels, the angle and orientation determine whether the inflation point is accessible and correctly positioned after assembly.
Should valve requirements be written on every buying-list row?
Yes. Keeping size, valve, material, quantity and packing in separate columns reduces assumptions and quotation errors.