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Size comparison · drawn to scale

Pontiac Trans Am III vs Citroen SM I: size comparison

  • Length SM I 21 mm0.8 in longer
  • Width About the same width
  • Height SM I 62 mm2 in taller

Car 1 blue, solid outline

Trans Am III Pontiac · 1982–1992 · Coupé Trans Am III 4,872 × 1,839 × 1,262 mm16 ft 0 in × 6 ft 0 in × 4 ft 2 in Change

Car 2 coral, dashed outline

SM I Citroen · 1970–1975 · Coupé SM I 4,893 × 1,836 × 1,324 mm16 ft 1 in × 6 ft 0 in × 4 ft 4 in Change
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  • Car 1, blue, solid outline: Trans Am III
  • Car 2, coral, dashed outline: SM I
0 m1 m2 m3 m4 m5 m6 m1 m0 ft1 ft2 ft3 ft4 ft5 ft6 ft7 ft8 ft9 ft10 ft11 ft12 ft13 ft14 ft15 ft16 ft17 ft18 ft19 ft20 ft21 ft1 ft2 ft3 ft4 ftWheelbase 2,565 mmWheelbase 8 ft 5 inLength 4,872 mmLength 16 ft 0 in1,262 mm4 ft 2 inWheelbase 2,900 mmWheelbase 9 ft 6 inLength 4,893 mmLength 16 ft 1 in1,324 mm4 ft 4 in

Scale about 1:22 on a desktop screen · grid 500 mm1 ft · in Overlay both cars start at the front bumper Side view: dashed lines mark the axles

Dimensions and difference

The Trans Am III is 21 mm0.8 in shorter, 3 mm0.1 in wider and 62 mm2 in lower than the SM I. Its wheelbase is 335 mm1 ft 1 in shorter.

DimensionTrans Am IIISM IDifference, car 1 vs car 2
Length4,872 mm16 ft 0 in16 ft 0 in4,872 mm4,893 mm16 ft 1 in16 ft 1 in4,893 mm −21 mm−0.8 in −0.4%
Width1,839 mm6 ft 0 in6 ft 0 in1,839 mm1,836 mm6 ft 0 in6 ft 0 in1,836 mm +3 mm+0.1 in +0.2%
Height1,262 mm4 ft 2 in4 ft 2 in1,262 mm1,324 mm4 ft 4 in4 ft 4 in1,324 mm −62 mm−2 in −4.7%
Wheelbase2,565 mm8 ft 5 in8 ft 5 in2,565 mm2,900 mm9 ft 6 in9 ft 6 in2,900 mm −335 mm−1 ft 1 in −11.6%
Footprint8.96 m²96.4 sq ft96.4 sq ft8.96 m²8.98 m²96.7 sq ft96.7 sq ft8.98 m² −0.02 m²−0.3 sq ft −0.3%

Width without mirrors. Figures come from the catalog version pages; the drawing uses the same numbers. Body outlines are generic for the body type - proportions are exact, styling is not.

Garage and parking

A typical single garage is about 5.5 × 3.0 m18 ft 1 in × 9 ft 10 in inside; a parking bay about 5.0 × 2.5 m16 ft 5 in × 8 ft 2 in. Room to open a door: about 600 mm2 ft each side.

Trans Am III

Single garage
Tight 628 mm2 ft 1 in to spare in length, 581 mm1 ft 11 in each side
Parking bay
Tight 128 mm5 in to spare in length, 331 mm1 ft 1 in each side

SM I

Single garage
Tight 607 mm2 ft 0 in to spare in length, 582 mm1 ft 11 in each side
Parking bay
Tight 107 mm4 in to spare in length, 332 mm1 ft 1 in each side

Check your own garage with these cars

Frequently asked questions

Which is bigger, the Pontiac Trans Am III or the Citroen SM I?

The Citroen SM I is the bigger car by footprint (length × width). The Trans Am III is 21 mm shorter, 3 mm wider and 62 mm lower than the SM I. Its wheelbase is 335 mm shorter.

Will the Pontiac Trans Am III and the Citroen SM I fit in a standard garage?

In a typical single garage of 5.5 × 3.0 m inside: The Pontiac Trans Am III fits, but it is tight to get out (628 mm to spare in length, 581 mm each side). The Citroen SM I fits, but it is tight to get out (607 mm to spare in length, 582 mm each side). Widths are without mirrors; check your own garage with our garage checker.

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