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LEGO Missing Piece Checker

Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece and leave with the element ID LEGO asks for, or a link to buy the part.

Street Bike

Checking

8420 Street Bike

506 pieces in 98 part and color combinations.

Before you call it missing

Builders who report a missing piece often find it in one of these places. Tick each one off as you look.

Look-alike colors in this set

These parts appear in this set in two colors that are easy to confuse. If you are one short in one color, check whether it went in where the other color belongs. Each color has its own element ID in the parts list at the back of the instructions.

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Piece checklist

Technic Beams 124 pieces

  • Technic Beam 1 x 2 Thin Black Part 41677 Element 6338428 or 4167726 ×24
  • Technic Beam 1 x 4 Thin Black Part 32449 Element 6327548 or 4142236 ×10
  • Technic Beam 1 x 5 Thick Black Part 32316 Element 4142135 or 4140429 ×5
  • Technic Beam 1 x 6 Thin Black Part 32063 Element 6163980 or 4114634 ×2
  • Technic Beam 1 x 7 Thick Black Part 32524 Element 4495935 or 4155458 ×1
  • Technic Beam 1 x 9 Bent (7 - 3) Thick Black Part 32271 Element 6276835 or 4140327 ×1
  • Technic Beam 1 x 9 Thick Black Part 40490 Element 4645732 or 4542788 ×2
  • Technic Beam 2 x 4 L-Shape Thick Black Part 32140 Element 6271825 or 4120017 ×2
  • Technic Beam 3 x 3 L-Shape Thin Black Part 32056 Element 6271810 or 4112287 ×3
  • Technic Beam 1 x 11.5 Double Bent Thick Light Bluish Gray Part 32009 Element 6271156 or 4234240 ×4
  • Technic Beam 1 x 3 Thin Light Bluish Gray Part 6632 Element 6360043 or 4211566 ×13
  • Technic Beam 1 x 5 Thick Light Bluish Gray Part 32316 Element 4211651 ×2
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Light Bluish Gray Part 6629 Element 6279885 or 4255613 ×2
  • Technic Beam 3 x 3 L-Shape with Quarter Ellipse Thin Light Bluish Gray Part 32249 Element 6590052 or 6336743 ×2
  • Technic Beam 3 x 5 L-Shape with Quarter Ellipse Thin Light Bluish Gray Part 32250 Element 4234247 ×2
  • Technic Beam Triangle Thin [Type I] Light Bluish Gray Part 2905 Element 4211653 ×4
  • Technic Beam 1 x 3 Thick Red Part 32523 Element 4153718 ×3
  • Technic Beam 1 x 3 Thin Red Part 6632 Element 6364451 or 4107824 ×15
  • Technic Beam 1 x 4 Thin with Stud Connector Red Part 2825 Element 6392956 or 4227649 ×2
  • Technic Beam 1 x 5 Thick Red Part 32316 Element 4142132 or 4128589 ×1
  • Technic Beam 1 x 5 Thin Red Part 32017 Element 4503419 or 4163978 ×4
  • Technic Beam 1 x 7 Bent (4 - 4) Thick Red Part 32348 Element 6332236 or 6278130 ×4
  • Technic Beam 1 x 7 Thick Red Part 32524 Element 4495933 or 4162098 ×4
  • Technic Beam 1 x 9 Bent (7 - 3) Thick Red Part 32271 Element 6276845 or 6188299 ×5
  • Technic Beam 1 x 9 Thick Red Part 40490 Element 4645733 or 4192225 ×2
  • Technic Beam 3 x 3 L-Shape with Quarter Ellipse Thin Red Part 32249 Element 6403900 or 4566064 ×4
  • Technic Beam 1 x 3 Thin Yellow Part 6632 Element 6344174 or 4107823 ×1

Technic Pins 106 pieces

  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Black Part 6558 Element 655826 ×22
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 2 spares in the box ×41
  • Technic Pin with Friction Ridges Lengthwise and Towball Black Part 6628 Element 4184169 or 662826 ×6
  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×19
  • Technic Pin 3/4 Dark Bluish Gray Part 32002 Element 32002199 or 4211050 2 spares in the box ×10
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Light Bluish Gray Part 32054 Element 4211865 ×3
  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×5

Technic Axles 86 pieces

  • Technic Axle 2 Notched Black Part 32062 Element 4109810 or 3206226 ×20
  • Technic Axle 4 Black Part 3705 Element 370526 ×14
  • Technic Axle 6 Black Part 3706 Element 370626 ×4
  • Technic Axle 8 Black Part 3707 Element 370726 ×1
  • Technic Axle 3 with Stud Dark Bluish Gray Part 6587 Element 6587199 or 6129590 ×2
  • Technic Axle 5.5 with Stop [Flat Short End] Dark Bluish Gray Part 32209 Element 4263624 ×1
  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×23
  • Technic Axle 5 Light Bluish Gray Part 32073 Element 32073194 or 4211639 ×14
  • Technic Axle 7 Light Bluish Gray Part 44294 Element 44294194 or 4211805 ×7

Technic Connectors 72 pieces

  • Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle) Black Part 6553 Element 4107765 or 655326 ×3
  • Technic Axle Connector Ridged [with x Hole x Orientation] Black Part 6538b Element 4113805 or 4107083 ×3
  • Technic Axle Connector with Axle Hole Black Part 32039 Element 4107081 or 3203926 ×5
  • Technic Axle and Pin Connector Angled #4 - 135° Black Part 32192 Element 6262897 or 4121610 ×3
  • Technic Axle and Pin Connector Perpendicular Black Part 6536 Element 6261371 or 4173668 ×13
  • Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Black Part 32184 Element 6276951 or 4121667 ×6
  • Technic Axle Connector Ridged [with x Hole x Orientation] Light Bluish Gray Part 6538b Element 4211543 ×5
  • Technic Axle and Pin Connector Angled #1 Light Bluish Gray Part 32013 Element 6296859 or 4211550 ×1
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Light Bluish Gray Part 42003 Element 6273724 or 4211779 ×17
  • Technic Pin Connector Perpendicular 2 x 2 Bent Light Bluish Gray Part 44809 Element 4211880 ×1
  • Technic Pin Connector Toggle Joint Smooth Double with 2 Pins Light Bluish Gray Part 48496 Element 4255618 ×1
  • Technic Axle and Pin Connector Perpendicular Red Part 6536 Element 6261373 or 4188298 ×2
  • Technic Axle and Pin Connector Perpendicular Double Red Part 32291 Element 6280393 or 4241474 ×6
  • Technic Axle and Pin Connector Toggle Joint Smooth Red Part 32126 Element 6598914 or 4614799 ×2
  • Technic Pin Connector Round [No Slot] Red Part 75535 Element 75854 ×2
  • Technic Axle and Pin Connector Angled #5 - 112.5° Yellow Part 32015 Element 4521998 or 4107068 ×2

Technic Special 41 pieces

  • Technic Link Black Part 3711a Element 371126 1 spare in the box ×30
  • Technic Disc 5 x 5 Notched with Pin [Plain] Light Bluish Gray Part 32439b Element 4261817 ×2
  • Technic Tooth 1 x 3 with Axle Hole [Rounded Underside] Red Part 41669 Element 4185661 Also in Trans-Red ×2
  • Technic Tooth 1 x 3 with Axle Hole [Rounded Underside] Trans-Brown Part 41669 Element 6052989 or 4543608 ×5
  • Technic Tooth 1 x 3 with Axle Hole [Rounded Underside] Trans-Red Part 41669 Element 4163567 Also in Red ×2

Technic Bushes 28 pieces

  • Technic Bush Black Part 3713 Element 6332148 or 6210506 2 spares in the box ×9
  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 1 spare in the box ×4
  • Technic Bush 1/2 Smooth with Axle Hole Reduced Light Bluish Gray Part 32123a 2 spares in the box ×13
  • Technic Bush Yellow Part 3713 Element 4238814 or 659024 1 spare in the box ×2

Technic Steering, Suspension and Engine 17 pieces

  • Technic Engine Crankshaft Center Dark Bluish Gray Part 2854 Element 6007058 or 4210987 ×1
  • Technic Engine Connecting Rod Light Bluish Gray Part 2852 Element 6000018 or 4655728 ×4
  • Technic Engine Crankshaft Light Bluish Gray Part 2853 Element 6640384 or 4211609 ×2
  • Technic Engine Cylinder with Side Slots Light Bluish Gray Part 2850a ×4
  • Technic Universal Joint 4L [Complete Assembly] Light Bluish Gray Part 9244 Element 9244194 or 4240416 ×1
  • Technic Engine Piston Round Yellow Part 2851 Element 4112203 or 285124 ×4
  • Technic Shock Absorber 11.5L [Complete Assembly] Yellow Part 48912c01 Element 4262815 ×1

Technic Gears 8 pieces

  • Technic Gear 12 Tooth Bevel Light Bluish Gray Part 6589 Element 6589194 or 4565450 ×4
  • Technic Gear 12 Tooth Double Bevel Light Bluish Gray Part 32270 Element 32270194 or 4211634 ×1
  • Technic Gear 16 Tooth with Round Holes [Old Style] Light Bluish Gray Part 4019 Element 4562487 or 4211563 ×1
  • Technic Gear 20 Tooth Double Bevel with Axle Hole Type 2 [X Opening] Light Bluish Gray Part 32269 Element 32269194 or 4211635 ×1
  • Technic Gear 24 Tooth [New Style with Single Axle Hole] Light Bluish Gray Part 3648b Element 4211565 ×1

Technic Panels 8 pieces

  • Technic Panel Fairing #20 Large Long, Small Hole, Side A Red Part 44350 Element 4277117 or 4205036 ×1
  • Technic Panel Fairing #21 Large Long, Small Hole, Side B Red Part 44351 Element 4277095 or 4205039 ×1
  • Technic Panel Fairing #22 Large Short, Small Hole, Side A Red Part 44352 Element 4276978 or 4205040 ×1
  • Technic Panel Fairing #23 Large Short, Small Hole, Side B Red Part 44353 Element 4277113 or 4205041 ×1
  • Technic Panel Fairing #24 Small Short, Small Hole, Side B Red Part 47712 Element 4218893 ×2
  • Technic Panel Fairing #25 Small Short, Small Hole, Side A Red Part 47713 Element 4218894 ×2

Wheels and Tyres 4 pieces

  • Tyre Technic Street Bike Narrow, Front Black Part 51380 Element 4259498 ×1
  • Tyre Technic Street Bike Wide, Rear Black Part 51379 Element 4259497 ×1
  • Wheel Technic Street Bike Light Bluish Gray Part 51378 Element 4263437 ×2

Minifig Accessories 2 pieces

  • Equipment Signal Paddle Light Bluish Gray Part 3900 Element 4211753 ×2

Technic Bricks 2 pieces

  • Technic Brick 1 x 6 [5 Pin Holes] Black Part 3894 Element 389426 ×2

Transportation - Sea and Air 2 pieces

  • Engine Smooth Large [2 x 2 Thin Top Plate] Light Bluish Gray Part 4868b Element 4263610 ×2

Windscreens and Fuselage 2 pieces

  • Windscreen 9 x 3 x 1 2/3 Bubble Canopy Red Part 47844 Element 4566264 or 4263632 ×1
  • Windscreen 8 x 6 x 2 Curved with Red and Silver Racing Stripes Print Trans-Brown Part 41751pr0005 Element 4263436 ×1

Hinges, Arms and Turntables 1 piece

  • Hinge Cylinder 1 x 2 Locking with 1 Finger and Axle Hole On Ends Red Part 30552 Element 4263607 ×1

Large Buildable Figures 1 piece

  • Large Figure Skeletal, Torso, Lower Section (Rahkshi) Light Bluish Gray Part 44135 Element 4192686 ×1

Plates 1 piece

  • Plate 2 x 2 Red Part 3022 Element 4613974 or 302221 ×1

Tiles Special 1 piece

  • Tile Special 1 x 2 Grille with Bottom Groove Red Part 2412b Element 241221 ×1

Tick each piece as you find it, or mark it missing.

When a piece really is missing

Ask LEGO

LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for the set number and each piece's element ID, the number printed beside the piece in the parts list at the back of the instructions. This checker lists both.

Request a replacement from LEGO

Buy the piece

Mark a piece missing and your list links it to an eBay search for that part, which also covers pieces from older or second-hand sets.

Keep a record

Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.

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