Case Study: TBR Tires and Retreading for a Kenyan Fleet

Fleet tire decisions in Kenya are rarely about the price on the invoice. On long-haul routes between Mombasa and the interior, a truck tire is subjected to sustained heat, repeated load cycles and road surfaces that punish both tread and casing. A fleet that buys on unit price alone usually discovers the real cost twelve to eighteen months later, when the tire is worn out and the casing underneath is too damaged to reuse.

This case looks at a Kenyan long-haul operator that changed the way it buys TBR (truck and bus radial) tires. The change was not a switch to a different brand or a discount negotiation. It was a move to treat the casing — the structural body of the tire — as the asset, and to compare purchase options on cost per kilometre rather than purchase price.

The comparison: cheapest tire vs. retreadable tire

The fleet originally purchased tires on the basis of the lowest delivered unit price available at the time of need. Replacements were ordered in small, irregular batches from whichever supplier could deliver fastest. Two problems surfaced within the first year.

First, casings were being scrapped at the end of their first tread life. Inspection showed sidewall damage and bead-area distress that made retreading uneconomic. Second, tires delivered in different batches behaved differently — tread wear rates varied across the same route, which made it impossible to plan replacement intervals or compare driver and route performance fairly.

The alternative was a retreadable TBR casing sourced through a consistent supply channel, with batch information recorded at receipt and casing inspection formalised as a routine step. The table below sets out the comparison the fleet used in its evaluation.

Evaluation criterion	Lowest-price, irregular purchasing	Retreadable TBR with batch control
Purchase basis	Lowest unit price at time of need	Cost per kilometre over full casing life
Casing reuse	Usually scrapped after first tread	Inspected and retreaded where structurally sound
Batch traceability	Mixed batches, no records	Batch recorded at receipt; wear compared by batch
Replacement planning	Reactive, driven by failures	Scheduled from wear-rate data
Supplier relationship	Transactional, multiple sources	Single channel with defined specifications

How the cost-per-kilometre calculation works

Cost per kilometre is not a marketing figure; it is a division the fleet can perform with its own records. The method used here has four inputs:

• Acquisition cost of the new tire, including freight and clearance to the fleet yard.
• First-life kilometres, taken from odometer records for the axle position and route type where the tire ran.
• Retread cost and retread-life kilometres for each retread the casing supports.
• Casing end-of-life value — effectively zero if scrapped, or the residual credited by the retreader.

Total cost is acquisition cost plus the sum of retread costs, minus any residual. Total kilometres is first-life kilometres plus the kilometres delivered by each retread. Dividing the first by the second gives cost per kilometre for that casing over its whole service life.

The comparison only becomes meaningful when the denominator includes retread life. A tire bought at a lower price that yields one tread life and is then scrapped can easily produce a higher cost per kilometre than a more expensive casing that supports additional retreads — provided the casing survives. That proviso is the whole argument, and it is why inspection discipline matters as much as the purchase decision.

Two cautions apply. The fleet excluded tires damaged in accidents from the comparison, because those losses are operational rather than product-related. It also kept route categories separate: a casing that performs on tarmac should not be judged against one working on unsealed access roads.

Casing inspection and retread limits

Retreading is only rational when the casing is sound. The fleet adopted a short inspection routine before any casing was sent for retreading:

• Check the inner liner for separation, ripples or evidence of run-flat damage.
• Inspect the bead area for deformation, cuts and heat damage from improper mounting.
• Look for sidewall penetrations and assess whether they reach the cord body.
• Confirm the casing has not been repaired previously in a way that compromises the belt package.
• Record the casing's service history: axle position, route, inflation practice and previous retread count.

The number of retreads a casing can take is not a fixed figure. It depends on the casing construction, the severity of the duty cycle, inflation maintenance and how well the tire was matched to the axle position. The fleet therefore set its own limits from observed results rather than adopting a blanket rule: a casing with a clean inspection history on a long-haul tractor axle was treated differently from one that had seen construction-site access roads. Tires that failed inspection were removed from the retread stream immediately, because a failed retread costs more than a scrapped casing — it consumes a slot in the retread programme and can fail in service.

Why purchase-batch consistency matters

The least obvious lesson from this case is about purchasing discipline rather than tire technology. When tires arrive in mixed batches from multiple sources, the fleet loses the ability to compare. Wear differences between batches get attributed to routes or drivers when the real variable is the tire itself. Replacement forecasting becomes guesswork.

By consolidating to a single supply channel and recording batch details at receipt, the fleet could compare like with like. Tread wear on the same route, same axle position and same load profile became a meaningful measurement. That in turn made it possible to project replacement dates, hold sensible buffer stock, and negotiate retread volumes with a clearer picture of how many casings would actually reach the retreader.

Batch consistency also simplifies warranty and quality conversations. If a wear anomaly appears across one batch and not others, the discussion with the supplier is specific and evidence-based. If it appears across all batches, the issue is more likely operational — inflation, alignment or loading — and the fleet can act on it directly.

The supply arrangement

The tires in this programme are TBR truck and bus radials supplied direct from the Aolais factory in Huangshi, Hubei. The range also covers OTR tires for mining and construction service and pickup and off-road patterns, which allows the fleet's mixed vehicle base to be served through one channel. The factory holds GCC, SASO, SONCAP and DOT certifications, which matters for fleets and distributors moving goods across Gulf, West African and East African markets with differing conformity requirements.

Shipments can be consolidated: TBR tires, brake components, shock absorbers and filters can travel in a single mixed container, which reduces landed cost per unit for buyers ordering across categories. Documentation can be issued under the factory's own name or under a nominated agent's name, depending on the buyer's import structure.

What the fleet changed, and what it did not

The fleet did not change its routes, its load profiles or its maintenance schedule as part of this evaluation. Those variables were held constant deliberately, so that the effect of the purchasing change could be observed. What changed was the basis of comparison, the recording of batch data, and the routine inspection of casings before retreading.

The practical conclusion is straightforward. A TBR tire should be evaluated as a casing with a service life, not as a consumable bought at the lowest price of the day. Cost per kilometre over the full casing life, supported by recorded batch data and disciplined inspection, gives fleet managers a defensible basis for procurement decisions. It also gives distributors a credible way to present retreadable TBR products to fleet customers who are used to comparing invoices rather than total cost.

For buyers in Kenya and across East Africa, the relevant questions are therefore specific: what casing construction is being supplied, what inspection standard the retreader applies, how batches are identified, and whether the supplier can hold that consistency across repeat orders. Those questions are answerable. Headline unit price, on its own, is not.