Ask ten plant managers whether radial OTR tyres are worth the money and you will get ten firm answers, about half of them yes. Both camps are usually right about their own sites. The construction that wins depends on how many hours your machines run, how far they travel loaded, and what the ground does to sidewalls.
This article sets out the real differences so you can make the call for your own fleet.
How the two are built
A bias (cross-ply) tyre has layers of fabric cord running diagonally from bead to bead, each layer crossing the one below. The sidewall and tread are effectively one structure, so when the sidewall flexes, the tread flexes with it. You can identify a bias tyre by the dash in its size, for example 23.5-25.
A radial tyre has a body ply running straight across from bead to bead, with a separate package of steel belts under the tread. The sidewall flexes on its own while the belts hold the tread flat on the ground. Radials have an R in the size: 23.5R25.
That one structural difference explains almost everything else.
Where radials win
- Heat. Because the tread does not flex with the sidewall, radials generate less heat on long, loaded runs. Heat is the main enemy of tyres on dump trucks and haul cycles.
- Hours. With a flatter footprint and cooler running, radials typically deliver noticeably more hours before the tread is gone, especially on haulers.
- Traction and ride. The larger, steadier footprint grips better and rides more smoothly, which operators notice over a long shift.
- Fuel. Lower rolling resistance means slightly lower fuel use, which matters on machines that travel a lot.
- Cut resistance in the tread. The steel belts give good protection against penetration through the crown.
Where bias tyres win
- Upfront cost. A bias tyre costs meaningfully less than a radial in the same size. For a machine that only works a few hundred hours a year, the radial may never earn that back.
- Sidewall toughness. The thick, multi-ply sidewall of a bias tyre tolerates knocks from rocks, kerbs and debris better than the thinner radial sidewall. On cluttered or tight sites this is a real advantage.
- Stability under static load. The stiffer sidewall gives a more stable feel when lifting, which some operators prefer on loaders and handlers.
- Repairs. Bias tyres are familiar to every tyre shop in the country and simpler to repair in the field.
- Availability. In Pakistan most common OTR sizes are easier to find in bias construction, which can mean a faster turnaround when a machine is down. Local manufacturing is also growing: General Tyre (GTR) developed its first OTR tyres in 2023.
Think in cost per hour, not price per tyre
The fair way to compare is the cost per working hour:
A simple illustration, with round numbers only to show the logic. If a bias tyre costs 100 units and lasts 2,000 hours, it costs 0.050 per hour. If a radial costs 150 units and lasts 3,300 hours, it costs about 0.045 per hour, slightly cheaper despite the higher price. But if a sidewall cut ends that radial at 1,800 hours, it costs 0.083 per hour, far worse than the bias.
So the question is not which tyre is better. It is which tyre will reach more of its potential life on your site.
A practical way to decide
| Your situation | Leans towards |
|---|---|
| Dump trucks or ADTs on long haul roads | Radial |
| Machines running two shifts, most days | Radial |
| Loader doing long carry cycles across a yard | Radial |
| Loader at a short-cycle face with sharp rock and spillage | Bias (deep tread) |
| Graders and backhoes on mixed small sites | Bias |
| Machines that work only part of the year | Bias |
| Tight, cluttered sites with kerbs and debris | Bias |
One rule that is not up for debate
Never mix bias and radial tyres on the same axle. They have different rolling diameters under load and different flex behaviour, so one tyre ends up carrying more than its share. On machines with a locked or limited-slip axle, mixing can also stress the drivetrain. If you switch construction, switch a full axle at a time, and ideally the whole machine.
If you are not sure, run a trial
The most reliable way to settle the debate for your fleet is to fit radials to one machine that works alongside an identical machine on bias tyres. Record hours, removals and the reason for each removal for a few months. The numbers usually make the decision obvious, and they make it easy to justify to whoever signs the purchase orders.
We supply both bias and radial OTR tyres, and we are happy to talk through which one suits a particular machine before you commit to a full fleet.
Need a price on these tyres?
Send a sidewall photo or your size list. Quotes usually within one business day.