Classic Trial Size
4284-1 Universal Building Set 1999 123 parts 2% repair risk Easy
Classic Trial Size (4284-1) is a LEGO Universal Building Set from 1999. The set contains 123 parts across 12 part and colour combinations in 6 colours — the full inventory below shows exactly which pieces you need to build or complete it.
Parts Inventory
| Part | Qty | LEGO price each |
|---|---|---|
 Tile Special 1 x 2 Grille with Bottom Groove 2412b | 2× | €0,06 |
 Tile Special 2 x 2 with Top Pin 2460 | 1× | Check price → View |
 Propeller 4 Blade 5 Diameter with Rounded Ends, Open Hub 2479 | 1× | Check price → View |
 Brick Special 2 x 2 with 2 Pins and Axle Hole 30000 | 2× | Check price → View |
 Brick 2 x 4 3001 | 1× | €0,22 |
 Brick 2 x 4 3001 | 1× | €0,22 |
 Brick 2 x 2 3003 | 2× | €0,13 |
 Brick 2 x 2 3003 | 2× | €0,13 |
 Brick 2 x 2 3003 | 2× | €0,13 |
 Brick 2 x 2 3003 | 2× | €0,13 |
 Brick 1 x 2 3004 | 4× | €0,11 |
 Brick 1 x 2 3004 | 2× | €0,11 |
Repairability
Can you fix Classic Trial Size if a piece goes missing?
1 of the 50 part+color combinations in this set appear in 3 or fewer sets ever made. Lose one of those and a replacement is very hard to find.
Theme average
1.9%
All sets
6.7%
Hardest to replace
More Universal Building Set sets
Browse more LEGO Universal Building Set sets related to Classic Trial Size, including models from 1999 and other sets in the same theme.
Build DNA
Parts inventory insights for Classic Trial Size
123 pieces puts this build -73% against the average Universal Building Set set and -36% against the average 1999 release.
Vs average Universal Building Set set
Average Universal Building Set set: 455 pieces across 55 other sets.
Vs average 1999 set
Average 1999 set: 192 pieces across 144 other sets.
Color profile
Dominant color
Black
Unique parts
0.6 pieces per unique type
Repeat factor
Average pieces per unique type.
Most used part
Brick 1 x 1
22xResults are based on official LEGO part inventories. Accuracy improves as you confirm set completeness.
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