Custom size
Mattress InsiderLuxury Gel Memory Foam
- Memory foam
- 8 in thick
- not stated
Made to 54 × 80 inGet a quote
Thor Quantum LC21 mattress size
Main bed54 × 80 inCustom size
That isn't a standard mattress size, so order a custom size cut to your platform.
Thor spec sheet, 2026.
Bunks52 × 96 in
Bunk. Thor spec sheet, 2026.
Common RV bunk sizes →
Mattresses in 54 × 80 in
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Bunk mattresses in 52 × 96 in
Some bunks have a rounded corner, so trace yours before a custom cut. A thicker bunk mattress takes headroom from the bunk above.
Custom size
Mattress InsiderLuxury Gel Memory Foam
- Memory foam
- 8 in thick
- not stated
Made to 52 × 96 inGet a quote
Bed sizes by year
| Year | Main bed | Bunks | Other beds | Source |
|---|---|---|---|---|
| 2025 | 54 × 80 in Full | 52 × 96 in | – | Thor spec sheet |
| 2026 | 54 × 80 in Full | 52 × 96 in | – | Thor spec sheet |
Years not listed weren't published.
The LC21 floorplan
Thor's 2027 LC21 floorplan.
Is this your LC21?
Check the year and length against your RV before you order.
| Year | Model | Length | Sleeps |
|---|---|---|---|
| 2025 | Quantum LC21 | – | – |
| 2026 | Quantum LC21 | – | – |
| 2027 | Quantum LC21 | 24'-1" | 4 |
Other Quantum mattress sizes
Sources
- Thor (media-center.thormotorcoach.com): https://media-center.thormotorcoach.com/m/7862dac75d169fcf/original/Z64ALJbqstJ9-lIS_2025-TS-Quantum-021225-pdf.pdf
- Thor (media-center.thormotorcoach.com): https://media-center.thormotorcoach.com/m/79058c180a7dd728/original/aM1xcJ5xUNkB06Ym_2026-OH-Quantum-pdf.pdf
- Thor (thormotorcoach.com): https://www.thormotorcoach.com/quantum/floor-plans/lc21
Questions
What size mattress is in the Thor Quantum LC21?
The main bed is 54 × 80 in (Thor spec sheet, 2026).
What size are the Thor Quantum LC21 bunk mattresses?
52 × 96 in (Thor spec sheet, 2026).