Spinboss Mobile Tyre Fitting: Why Van Load Index Beats Rim Size

What does the load index change on a Spinboss callout?

The problem appears before the wheel comes off: a van may have the right rim size but the wrong load index. A 215/65 R16 tyre in 102/100 carries less than a 104/102 version. The cause is that vans spend much of their life near gross vehicle weight, and a passenger-car tyre can pass a visual check yet overheat under load. The solution is to read the vehicle placard and the existing sidewall before confirming a replacement. A spinboss mobile fitter can compare those numbers at the kerbside, which matters when the van is loaded and cannot be driven to a depot.

Why is the speed rating not a performance upgrade?

Drivers sometimes choose a higher speed rating as a safety margin. The cause is that speed rating is tied to heat resistance and construction, not just top speed; mixing ratings across an axle can produce uneven handling. Keep the rating at or above the manufacturer minimum, and replace tyres in axle pairs when tread depth differs by more than 2 mm. The expert check is the placard, not the tyre brochure.

How should pressure be set after a mobile replacement?

A new tyre at the old pressure can feel vague on the first mile. Load index, sidewall stiffness, and cold temperature change the contact patch; pressure should be set cold. Use the placard loaded or normal figures, not the maximum on the sidewall, and recheck after 50 miles. For vans, a 10 psi error can be enough to alter shoulder wear.

Does tread depth matter on a mixed axle?

The legal minimum is 1.6 mm across the central three-quarters of the tread, but wet braking on a loaded van deteriorates well before that. The cause is water clearance: a 3 mm tyre moves less water than a 5 mm tyre, so pairing a worn tyre with a new one can shift grip under braking. The solution is to match axle pairs within 2 mm and rotate tyres before the shoulders scrub.

What is the practical checklist before the fitter arrives?

• Photograph the sidewall markings and the door-frame placard.
• Confirm whether the van is empty or at working weight.
• Note the wheel type and locking nut key location.
• Clear space on the kerb side and check for low branches or cables.

These details reduce the chance of a second visit. The result is a replacement that matches the axle load, not just the wheel diameter.