S10 | Blazer (1982-2004)

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1st Gen S10 (1982–1993)

Popular Wheel Sizes (Street/Drag):

  • 15x7 – Classic street setup, often with +0 to +12mm offset

  • 15x8 – Common rear size, +0 to –12mm offset (3.75"–4.5" BS)

  • 15x10 – Drag rears; ideal offset around –44mm (4.5" BS)

  • 17x8 – Modern look, +0 to +15mm offset

  • 17x9.5 or 17x10 – More aggressive rears, around +6 to –19mm offset depending on tire and suspension

2nd Gen S10 (1994–2004)

Popular Wheel Sizes (Street/Drag/Pro Street):

  • 15x7 – Still common; +6mm offset for flush fit

  • 15x8 – +0 to –12mm offset

  • 15x10 – Rear use; –38mm to –44mm offset (4.5" BS is ideal for stock suspension)

  • 17x8 – +0 to +15mm offset, clears with ease

  • 17x9.5 / 17x10 – Rear fitment depending on tire width and whether it’s notched or mini-tubbed

General Fitment Tips (Both Gens):

  • Fronts (15x4–15x6 drag skinnies): +0 to +20mm offsets generally work, but brake clearance (especially dual piston conversions) must be checked.

  • Rears (15x10): Aim for 4.5" backspacing (approx. –44mm offset) to sit just inside the fender on stock leaf spring setups.

  • Mini-tubbed trucks: Can handle 15x10 or 15x12 with 5.5" to 6.5" backspacing depending on notch depth and tire size.

20x10.5 | +13 Offset | 5x4.75 Bolt Pattern Fitment Summary for S10:

  • Backspacing: ~6.4"
    (calculated using the formula: (width in inches + 1) / 2 + (offset in inches) → (10.5 + 1)/2 + 0.512” = ~6.38”)

Rear Fitment (Most Likely Use Case):

  • Stock rear setup (leaf springs, unmodified bed):

    • Too aggressive inward—will likely rub frame or leaf springs

    • Would need at least a 1/4”–1/2” spacer to clear depending on tire width and sidewall

    • May require rolling the inner fender depending on tire

    • Ideal with a notched frame or mini-tubbed bed

  • Mini-tubbed or narrowed rear end:

    • Excellent fitment

    • Backspacing is perfect for tucked setups with adequate inner clearance

Popular 20" WELD Sizes That Fit S10 Builds:

20x8.5

  • Good for front or rear

  • Offset: +0 to +25mm

  • Backspacing: ~4.75" to 5.5"

  • Tires: 245/35R20 or 255/30R20

  • Perfect for a street truck stance

20x10

  • Great rear option for aggressive stance

  • Offset: +0 to +15mm

  • Backspacing: 5.5" to 6.25"

  • Works well with mild tubs or frame notch

20x12

  • Deep dish look for mini-tubbed or Pro Street S10s

  • Offset: –44mm to 0mm

  • Backspacing: 4.5" to 5.5" depending on rear mods

  • Requires careful measuring!