Mechanic checking a tyre with unusual specifications in a workshop, illustrating hard to find tyre sizes and limited availability.

How to Tell If a Tyre Size Will Be Hard to Get (And What to Do About It)

Bytyreroom

🕒 Reading time: 4 minutes

Ever had a customer call with a weird size that no one seems to have?

You ring around, check all your trade suppliers, and still can’t find one for same-day fitting.

Some tyres are just awkward — and you can usually spot them before wasting time.

This post helps you spot the warning signs of tricky sizes, so you can quote smarter, save time, and manage customer expectations better.

🚩 1. Look for Unusual Profiles or Widths

If a size doesn’t feel common, it probably isn’t.

Watch out for things like:

  • Very narrow tyres (e.g. 135/80R13, 145/70R12)
  • Wide or high-performance sizes (e.g. 255/35R19, 275/40R20)
  • Super high or low profiles (e.g. 60+ or below 35)
  • Small 4×4 or trailer sizes (e.g. 175R13C, 185/75R16)

These often aren’t stocked in bulk — even by big wholesalers.

🧱 2. Check for Run-Flat or XL Markings

Tyres marked with:

  • RFT (Run-Flat Technology)
  • SSR, ZP, DriveGuard, or other brand-specific run-flat terms
  • XL (extra load — not rare by itself, but some XL + RFT combos can be awkward)

…are often limited in brand choice or stock availability.

🧾 3. Watch for Load Index or Speed Rating Mismatches

A tyre might look like a normal size — but have an odd rating that trips you up.

Example:

  • A 225/45R17 is common
  • But if it needs 94W XL MOE Run-Flat (Mercedes Original Equipment)… that’s a different story

Always ask for the full spec, not just the size.

🔍 4. How to Check Availability Quickly

Save yourself time by checking:

  • Your wholesaler’s app or trade portal (like Tyreroom.com or the Tyreroom app)
  • Your most trusted trade supplier by phone or WhatsApp

If they don’t have it, it’s likely most others won’t either.

Pro tip: If the price looks really high across all suppliers — it probably means it’s low stock UK-wide.

🗣️ 5. What to Say to the Customer

Instead of just saying “I’ll check and call you back,” try:

“That size can be a bit tricky — let me check if it’s in stock before I promise anything. I’ll call you back shortly.”

Or if you can’t get it same-day:

“I can get that for tomorrow, but it’s a bit of a specialist size. Shall I book you in and hold one?”

This builds trust and stops them phoning five other places.

🔁 6. Can You Offer an Alternative?

Sometimes you can swap:

  • Standard for XL or vice versa — if load rating still covers vehicle
  • Similar brands or patterns
  • Same size, but non-RFT if the customer accepts it

Always check with the customer and note it on the invoice if you’re fitting anything different.

If unsure — don’t guess.

✋ 7. When to Walk Away

If the tyre:

  • Is totally unavailable
  • Would take 3–5 days to arrive
  • Would leave the customer unsafe or unhappy

It’s better to be honest and professional:

“To be honest, I don’t want to mess you around — it’s a very slow-moving size. I’d rather you get sorted quickly elsewhere.”

You’ll earn respect — and they may come back for future jobs.

Final Thought

Knowing how to spot rare tyre sizes helps you stay in control.

Less time wasted. More confident quotes. Happier customers.

Keep this post handy — and next time someone calls with a weird size, you’ll be ready.

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