Contact TreadSize
We read every message sent to hello@treadsize.com.
What to include
- Data corrections: if you spot a calculation error, include the tire size, what the tool showed, and what you believe the correct value should be (with a source if you have one).
- Guide feedback: link to the guide page and describe the section.
- General questions: fire away — we will respond as time allows.
Response time
We typically respond within 2–5 business days. We do not offer real-time tire fitment advice — for that, please consult a local tire professional who can inspect your vehicle directly.
Sources and calculation limits
Source note updated
June 2026
Calculation scope
Nominal dimensions from the size markings supplied. Vehicle installation is not verified.
Method and inputs
- Nominal geometry calculated from tire-size markings
- Original-equipment size references supplied by users or vehicle placards
- Diameter differences and theoretical rotation ratios; no installation approval
Calculated dimensions do not verify the tire model, load or speed rating, approved rim width, wheel offset, physical clearance, or vehicle systems. Confirm those against manufacturer specifications before installation.