Diameter Tolerance Filter
Filter a list of candidate tire sizes by a diameter tolerance you set, such as ±1%, ±2% or ±3%, or by a fixed mm and inch limit.
Filter candidates using specified limits.
Diameter Tolerance Filter: Tire Size Inputs
Compare two tire sizes here. Use the formulas and reference tables below for this tool's specific calculation.
How Diameter Tolerance Filter Works?
The Diameter Tolerance Filter works by calculating each candidate's diameter gap from a reference size and hiding every candidate outside the limit you set. The filter runs in 4 steps.
Set the reference
Type the stock size, for example 265/70 R17.
Paste candidates
Paste the list of sizes from a store or supplier.
Choose the limit
Enter a percent limit such as ±2%, or an absolute limit such as +15 mm / −10 mm (+0.59 in / −0.39 in).
Read pass and fail
The filter marks each candidate Pass or Fail and sorts passing sizes first.
Diameter Tolerance Filter Formula
The Diameter Tolerance Filter keeps a size when Lower ≤ (OD_c − OD_ref) ≤ Upper, with limits in percent or millimeters.
−T_low ≤ (OD_c − OD_ref) ÷ OD_ref × 100 ≤ T_high−L_low ≤ OD_c − OD_ref ≤ L_high (mm)- T_low, T_high
- Lower and upper percent limits
- L_low, L_high
- Lower and upper absolute limits (mm)
- OD_ref
- Reference diameter (mm)
Worked example
With 265/70 R17 (802.8 mm) as the reference and a ±2% limit, the candidate 275/65 R18 (814.7 mm, +1.48%) passes. The candidate 285/70 R17 (+3.49%) fails.
Diameter Tolerance Filter Conversion Table
The Diameter Tolerance Filter conversion table shows how 10 truck sizes pass or fail at ±1%, ±2% and ±3% against a 265/70 R17 reference.
| Candidate | Diameter | Gap | ±1% | ±2% | ±3% |
|---|---|---|---|---|---|
| 265/70 R17 | 31.61 in | +0.00% | Pass | Pass | Pass |
| 275/65 R18 | 32.07 in | +1.48% | Fail | Pass | Pass |
| 265/65 R18 | 31.56 in | -0.14% | Pass | Pass | Pass |
| 285/70 R17 | 32.71 in | +3.49% | Fail | Fail | Fail |
| 275/70 R17 | 32.16 in | +1.74% | Fail | Pass | Pass |
| 255/75 R17 | 32.06 in | +1.43% | Fail | Pass | Pass |
| 265/60 R18 | 30.52 in | -3.44% | Fail | Fail | Fail |
| 275/60 R20 | 32.99 in | +4.38% | Fail | Fail | Fail |
| 285/75 R16 | 32.83 in | +3.87% | Fail | Fail | Fail |
| 245/75 R17 | 31.47 in | -0.44% | Pass | Pass | Pass |
What is Diameter Tolerance Filter?
A Diameter Tolerance Filter is a tool that screens a list of tire sizes against a diameter limit and returns only the sizes inside the limit. The filter supports asymmetric limits, for example 0% to +3% when clearance allows growth but the speedometer forbids a shorter tire.
Common limits are ±3% for general replacement, ±1% for AWD vehicles and the vehicle maker's own value when the owner's manual lists one.
The filter suits long supplier lists where checking each size by hand takes too long.
What are the uses of Diameter Tolerance Filter?
There are 4 main uses of the Diameter Tolerance Filter, including supplier list screening and AWD compliance.
Supplier list screening
Reduce a 50-size stock list to the sizes that fit.
AWD compliance
Apply a ±1% limit for vehicles with a center differential or clutch pack.
One-sided limits
Accept only taller sizes, only shorter sizes or a custom window.
Fleet rules
Apply a fleet's written diameter policy to every quote.
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