1st Gen S10 (1982–1993)
Popular Wheel Sizes (Street/Drag):
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15x7 – Classic street setup, often with +0 to +12mm offset
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15x8 – Common rear size, +0 to –12mm offset (3.75"–4.5" BS)
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15x10 – Drag rears; ideal offset around –44mm (4.5" BS)
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17x8 – Modern look, +0 to +15mm offset
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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):
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15x7 – Still common; +6mm offset for flush fit
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15x8 – +0 to –12mm offset
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15x10 – Rear use; –38mm to –44mm offset (4.5" BS is ideal for stock suspension)
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17x8 – +0 to +15mm offset, clears with ease
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17x9.5 / 17x10 – Rear fitment depending on tire width and whether it’s notched or mini-tubbed
General Fitment Tips (Both Gens):
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Fronts (15x4–15x6 drag skinnies): +0 to +20mm offsets generally work, but brake clearance (especially dual piston conversions) must be checked.
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Rears (15x10): Aim for 4.5" backspacing (approx. –44mm offset) to sit just inside the fender on stock leaf spring setups.
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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):
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Stock rear setup (leaf springs, unmodified bed):
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Too aggressive inward—will likely rub frame or leaf springs
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Would need at least a 1/4”–1/2” spacer to clear depending on tire width and sidewall
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May require rolling the inner fender depending on tire
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Ideal with a notched frame or mini-tubbed bed
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Mini-tubbed or narrowed rear end:
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Excellent fitment
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Backspacing is perfect for tucked setups with adequate inner clearance
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Popular 20" WELD Sizes That Fit S10 Builds:
20x8.5
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Good for front or rear
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Offset: +0 to +25mm
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Backspacing: ~4.75" to 5.5"
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Tires: 245/35R20 or 255/30R20
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Perfect for a street truck stance
20x10
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Great rear option for aggressive stance
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Offset: +0 to +15mm
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Backspacing: 5.5" to 6.25"
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Works well with mild tubs or frame notch
20x12
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Deep dish look for mini-tubbed or Pro Street S10s
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Offset: –44mm to 0mm
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Backspacing: 4.5" to 5.5" depending on rear mods
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Requires careful measuring!
