Spec Sizes

Porsche 911 vs Cadillac XLR Dimensions & Size Comparison

Comparing 2021 vs 2009 catalog dimensions. Porsche 911 · Cadillac XLR

Same scale for both vehicles. Generic silhouette — proportional to measured length, height, width, wheelbase, and clearance.

Side view
  • Length177.9 in – 178.6 in
  • Height51.1 in – 51.3 in
  • Wheelbase96.5 in
  • Curb weight3,354 lb – 3,790 lb
Front / width
  • Width72.9 in – 74.9 in
  • Cadillac XLR width72.3 in

Which is bigger?

  • Length: Cadillac XLR is 0.6 in shorter (178.3 in vs 177.7 in)
  • Width: Cadillac XLR is 1.6 in narrower (73.9 in vs 72.3 in)
  • Height: Porsche 911 is 0.8 in taller (51.2 in vs 50.4 in)
  • Wheelbase: Cadillac XLR has a 9.2 in longer wheelbase (96.5 in vs 105.7 in)
  • Curb weight: Cadillac XLR is 75 lb heavier (3,572 lb vs 3,647 lb)

Biggest size differences

  1. Wheelbase: Cadillac XLR has a 9.2 in longer wheelbase (96.5 in vs 105.7 in)
  2. Width: Cadillac XLR is 1.6 in narrower (73.9 in vs 72.3 in)
  3. Curb weight: Cadillac XLR is 75 lb heavier (3,572 lb vs 3,647 lb)
  4. Height: Porsche 911 is 0.8 in taller (51.2 in vs 50.4 in)
  5. Length: Cadillac XLR is 0.6 in shorter (178.3 in vs 177.7 in)

Practical verdicts

  • Easier to fit in a short garageCadillac XLR — Cadillac XLR is shorter by 0.6 in Check garage fit for Porsche 911 · garage fit for Cadillac XLR
  • Narrower for tight parkingCadillac XLR — Cadillac XLR is narrower by 1.6 in
  • Smaller exterior footprintCadillac XLR — Based on length × width (Cadillac XLR)

Dimension comparison

SpecPorsche 911Cadillac XLRDifference
Length178.3 in177.7 in0.6 in
Width73.9 in72.3 in1.6 in
Height51.2 in50.4 in0.8 in
Wheelbase96.5 in105.7 in9.2 in
Curb weight3,572 lb3,647 lb75 lb

Values use trim midpoints when a model year lists a range (e.g. length 177.9 in – 178.6 in).

Compare by year

Overlapping model years with dimension data.

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