OTR Tyre Repair Decision Tool
OTR tyre damage?
A second opinion you can trust.
Whether you've had a patch failure, you're new to OTR, or you're sizing up alternatives to your current supplier, this short assessment gives you a technically grounded recommendation in minutes.
What brings you here?
Quick context, so we can route your message to the right person on our team.
What is the tyre construction?
What is the rim size?
Select the rim diameter range from your tyre's sidewall marking. This determines both the A-B non-repairable zone limit and the maximum repairable crown injury size.
Where is the injury on the tyre?
Select all that apply, a single incident can cause damage in more than one zone.
Select one or more
What type of injury is present?
Select the injury type for each affected zone. This determines whether repair is structurally safe.
What is the cord condition at the injury?
Inspect the prepared injury area. Cord condition is a primary factor in whether repair is structurally safe.
How far is the injury from the bead base?
Measure from the bead base (point A) to the centre of the injury on the inside of the tyre. The A-B limit for your rim size will be checked automatically.
23.5"–26.5" → 125 mm · 24.00"–27.00" → 125 mm · 26.5"–33.5" → 150 mm
30.00"–37.00" → 150 mm · 37.25"–37.50" → 255 mm · 40.00"–45.00" → 255 mm
If rim size is not yet known, select the closest range, it can be corrected at the next step.
What is the tyre's ply rating?
Find the ply rating on the tyre sidewall (shown as "** PR" or as a load range). This selects the correct bias / cross-ply patch from the Blackstone selection matrix.
What is the prepared injury size?
Enter the largest dimension of exposed body ply after preparation, not the surface cut size. This determines the correct patch.
Round injury, like a puncture? Enter the length only and leave width blank. For a cut, enter both length and width.
Optional, radial patches are sized in both directions. Enter the width measured across a cut.
Has this tyre been repaired before?
Previous repairs affect structural integrity, especially if overlapping with the current injury.
How much tread life remains?
Remaining tread depth affects whether repair is economically worthwhile, even when technically possible.
Has the tyre been run flat or significantly underinflated?
Run-flat operation causes internal sidewall damage that is often invisible from outside the tyre.
What is the operating environment?
This helps us understand where our patches are being used and how OTR tyres are damaged across different site types.
A direct line for your OTR questions
We'll email you a written copy of this assessment and connect you with a senior contact at Blackstone.
✓ Thanks. You'll hear from us within a working day, personally, by reply email.
About the manufacturer
Blackstone Rubber is a dependable quality OTR tyre patch manufacturer based in Jodhpur, India. We have been manufacturing and exporting OTR patches since 1985, supplying quarries, mines, and construction sites across more than 25 countries. This tool exists because the repair-or-replace decision is too often made on gut feel. It should be made on criteria.
If your assessment shows the tyre is repairable, the patches recommended above are manufactured by us, for all OTR sizes from 14" to 45".
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