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Size comparison · drawn to scale

Citroen SM I vs Pontiac Trans Am III: 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

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

Car 2 coral, dashed 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
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  • Car 1, blue, solid outline: SM I
  • Car 2, coral, dashed outline: Trans Am III
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 2,900 mmWheelbase 9 ft 6 inLength 4,893 mmLength 16 ft 1 in1,324 mm4 ft 4 inWheelbase 2,565 mmWheelbase 8 ft 5 inLength 4,872 mmLength 16 ft 0 in1,262 mm4 ft 2 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 SM I is 21 mm0.8 in longer, 3 mm0.1 in narrower and 62 mm2 in taller than the Trans Am III. Its wheelbase is 335 mm1 ft 1 in longer.

DimensionSM ITrans Am IIIDifference, car 1 vs car 2
Length4,893 mm16 ft 1 in16 ft 1 in4,893 mm4,872 mm16 ft 0 in16 ft 0 in4,872 mm +21 mm+0.8 in +0.4%
Width1,836 mm6 ft 0 in6 ft 0 in1,836 mm1,839 mm6 ft 0 in6 ft 0 in1,839 mm −3 mm−0.1 in −0.2%
Height1,324 mm4 ft 4 in4 ft 4 in1,324 mm1,262 mm4 ft 2 in4 ft 2 in1,262 mm +62 mm+2 in +4.9%
Wheelbase2,900 mm9 ft 6 in9 ft 6 in2,900 mm2,565 mm8 ft 5 in8 ft 5 in2,565 mm +335 mm+1 ft 1 in +13.1%
Footprint8.98 m²96.7 sq ft96.7 sq ft8.98 m²8.96 m²96.4 sq ft96.4 sq ft8.96 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.

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

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

Check your own garage with these cars

Frequently asked questions

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

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

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

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

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