How many pieces does the LEGO Combat Crawler X2 (7721-1) have?

The LEGO Combat Crawler X2 set (7721-1) contains 581 pieces. It was released in 2007 as part of the LEGO Exo-Force theme.

How can I find missing parts for LEGO set 7721-1?

On BrickMissing you can check which parts from the LEGO Combat Crawler X2 (7721-1) you already own. Add your LEGO collection and we'll show exactly which of the 581 pieces you're missing and which you already have.

Can I build the LEGO Combat Crawler X2 with parts I already have?

Use BrickMissing's free parts checker to find out. Add LEGO sets you own to your collection and we'll cross-reference all 581 parts to show your buildability percentage and which specific pieces you still need.

What theme is the LEGO Combat Crawler X2 from?

The LEGO Combat Crawler X2 (7721-1) belongs to the LEGO Exo-Force theme. You can browse all Exo-Force sets on BrickMissing to find more sets from this theme.

Combat Crawler X2

🏷️ 7721-1•🎨 Exo-Force•📅 2007•🧱 581 parts•Intermediate

Combat Crawler X2 (7721-1) is a LEGO Exo-Force from 2007. This page uses the available set and theme data until a fuller product description is available.

Parts Inventory

🧱 581 parts

Part	Color	Qty
Tile Special 1 x 2 Grille with Bottom Groove 2412b	Light Bluish Gray	2×
Tile Special 1 x 2 Grille with Bottom Groove 2412b	Black	3×
Plate Special 2 x 2 with 1 Pin Hole [Split Underside Ribs] 2444	Dark Bluish Gray	7×
Plate Special 2 x 2 with 1 Pin Hole [Split Underside Ribs] 2444	Black	1×
Plate 2 x 12 2445	Dark Bluish Gray	2×
Brick 2 x 6 2456	Black	2×
Brick Special 1 x 2 with Pin 2458	Dark Bluish Gray	8×
Plate Special 1 x 2 Side Handle [Free Ends] 2540	Yellow	3×
Plate Special 1 x 2 Side Handle [Free Ends] 2540	Black	4×
Technic Disc 3 x 3 2723	Black	2×

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Brick 2 x 6	2456	Black	2×
Brick Special 1 x 2 with Pin	2458	Dark Bluish Gray	8×
Plate Special 1 x 2 Side Handle [Free Ends]	2540	Yellow	3×
Plate Special 1 x 2 Side Handle [Free Ends]	2540	Black	4×
Technic Disc 3 x 3	2723	Black	2×
Technic Pin with Friction Ridges Lengthwise and Center Slots	2780	Black	33×
Technic Beam 1 x 4 Thin with Stud Connector	2825	Black	4×
Lever Small Base with Black Lever	298c02	Yellow	2×
Technic Brick 1 x 2 - 1 x 2 Angled with Bumper Holder [Closed Front]	2991	Black	4×
Brick 2 x 4	3001	Black	2×
Handlebars	30031	Light Bluish Gray	1×
Brick 1 x 2	3004	Dark Bluish Gray	1×
Brick 1 x 2	3004	Black	3×
Brick 1 x 1	3005	Black	4×
Fence Spindled 1 x 4 x 2 [2 Top Studs]	30055	Dark Bluish Gray	3×
Brick 1 x 6	3009	Light Bluish Gray	1×
Plate 2 x 4	3020	Light Bluish Gray	2×
Plate 2 x 3	3021	Red	2×
Plate 2 x 2	3022	Dark Bluish Gray	6×
Plate 2 x 2	3022	Red	1×
Plate 2 x 2	3022	Light Bluish Gray	4×
Plate 2 x 2	3022	Black	2×
Plate 1 x 2	3023	Black	2×
Plate 1 x 2	3023	Yellow	7×
Plate 1 x 2	3023	Light Bluish Gray	9×
Plate 1 x 1	3024	Trans-Red	2×
Plate 4 x 4	3031	Dark Bluish Gray	2×
Plate 4 x 4	3031	Black	1×
Plate 2 x 8	3034	Dark Bluish Gray	4×
Plate 4 x 8	3035	Black	4×
Arm Mechanical with 2 Clips [Battle Droid]	30377	Light Bluish Gray	1×
Slope 45° 2 x 3	3038	Black	2×
Slope 45? 2 x 2	3039	Yellow	1×
Slope 45? 2 x 2	3039	Dark Bluish Gray	1×
Technic Link 1 x 5	30397	Black	4×
Hinge Plate 1 x 8 Locking with Angled Side Extensions, Rounded Plate Underside, 9 Teeth	30407	Yellow	2×
Brick Special 1 x 4 with 4 Studs on One Side	30414	Black	2×
Slope 45° 2 x 1 Triple Smooth	3048b	Black	2×
Turntable 4 x 4 Locking Grooved Base	30516	Light Bluish Gray	1×
Brick Special 1 x 2 with 2 Pins, Round Pin Holes	30526	Light Bluish Gray	5×
Brick Round 1 x 1 Open Stud	3062b	Light Bluish Gray	2×
Turntable 4 x 4 Top, Locking	30658	Black	1×
Tile 2 x 2 with Groove	3068b	Black	1×
Tile 2 x 2 with Groove	3068b	Dark Bluish Gray	1×
Tile 1 x 2 with Engraved Code for Exo-Force	3069bpr0073	Yellow	1×
Technic Brick 1 x 2 [2 Pin Holes]	32000	Red	1×
Technic Plate 2 x 6 [5 Holes]	32001	Yellow	2×
Technic Beam 1 x 11.5 Double Bent Thick	32009	Dark Bluish Gray	2×
Technic Beam 1 x 11.5 Double Bent Thick	32009	Light Bluish Gray	4×
Technic Axle and Pin Connector Angled #1	32013	Dark Bluish Gray	16×
Technic Axle and Pin Connector Angled #5 - 112.5°	32015	Black	4×
Technic Brick 1 x 14 [13 Pin Holes]	32018	Black	6×
Technic Axle Connector with Axle Hole	32039	Black	2×
Technic Axle Connector with Axle Hole	32039	Light Bluish Gray	1×
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole]	32054	Red	6×
Technic Axle 2 Notched	32062	Red	8×
Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening]	32064b	Black	8×
Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening]	32064b	Yellow	1×
Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening]	32064b	Dark Bluish Gray	7×
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced	32123b	Light Bluish Gray	5×
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole	32184	Black	1×
Technic Driving Ring Extension, 4 Ridges	32187	Light Bluish Gray	8×
Technic Beam 1 x 9 Bent (7 - 3) Thick	32271	Red	2×
Technic Axle and Pin Connector Perpendicular Double	32291	Black	1×
Technic Beam 1 x 5 Thick	32316	Black	6×
Technic Beam 1 x 7 Bent (4 - 4) Thick	32348	Light Bluish Gray	1×
Brick 1 x 2 x 2 with Inside Axle Holder	3245b	Dark Gray	2×
Technic Beam 1 x 3 Thick	32523	Yellow	3×
Technic Beam 1 x 7 Thick	32524	Black	2×
Technic Beam 1 x 11 Thick	32525	Light Bluish Gray	6×
Technic Beam 3 x 5 L-Shape Thick	32526	Light Bluish Gray	2×
Technic Pin Connector Plate 1 x 2 x 1 2/3 [Two Holes On Top]	32530	Dark Bluish Gray	4×
Technic Brick 6 x 8 with 4 x 6 Opening	32532	Black	2×
Large Figure Weapon, Claw Hook with Axle	32551	Light Bluish Gray	12×
Brick Arch 1 x 6 x 2 - Thick Top with Reinforced Underside	3307	Black	2×
Plate 1 x 8	3460	Dark Bluish Gray	2×
Brick 1 x 3	3622	Light Bluish Gray	4×
Plate 1 x 3	3623	Red	4×
Slope Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes]	3660	Dark Bluish Gray	1×
Slope Inverted 45° 2 x 1	3665	Dark Bluish Gray	2×
Slope 75° 2 x 2 x 3 [Hollow Studs]	3684	Black	1×
Technic Brick 1 x 2 [1 Pin Hole]	3700	Light Bluish Gray	8×
Technic Brick 1 x 4 [3 Pin Holes]	3701	Dark Bluish Gray	2×
Technic Axle 4	3705	Black	5×
Technic Axle 6	3706	Black	1×
Technic Plate 2 x 4 [3 Holes]	3709	Dark Bluish Gray	8×
Technic Plate 2 x 4 [3 Holes]	3709	Black	6×
Plate 1 x 4	3710	Black	2×
Plate 1 x 4	3710	White	1×
Technic Bush	3713	Red	10×
Technic Axle 10	3737	Black	2×
Technic Plate 2 x 8 [7 Holes]	3738	Black	2×
Technic Axle Pin without Friction Ridges Lengthwise	3749	Tan	4×
Plate 2 x 6	3795	Dark Bluish Gray	1×
Plate 2 x 6	3795	Light Bluish Gray	1×
Plate 2 x 10	3832	Light Bluish Gray	2×
Plate Special 1 x 2 with Handles [Flat Ends / Low Attachment]	3839b	Black	2×
Technic Brick 1 x 6 [5 Pin Holes]	3894	Black	2×
Brick Round 2 x 2 with Axle Hole	3941	Yellow	2×
Antenna 1 x 4 with Rounded Top	3957a	Black	2×
Plate 6 x 6	3958	Dark Bluish Gray	1×
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)	4032a	Red	1×
Brick Special 1 x 1 with Headlight	4070	Red	2×
Wedge Curved 6 x 2 Right, Inner Ridges	41747	White	1×
Wedge Curved 6 x 2 Left, Inner Ridges	41748	White	1×
Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes	42003	Dark Bluish Gray	4×
Technic Pin 1/2	4274	Light Bluish Gray	2×
Technic Axle Pin with Friction Ridges Lengthwise	43093	Black	9×
Technic Rotation Joint Disk with Pin Hole and 3L Beam Thick	44224	Dark Bluish Gray	2×
Technic Rotation Joint Disk with Pin and 3L Beam Thick	44225	Light Bluish Gray	2×
Slope 45° 2 x 8	4445	Black	2×
Hinge Plate 1 x 4 Locking Dual 1 Finger	44568	Light Bluish Gray	4×
Hinge Panel 2 x 4 x 3 1/3 Locking Dual 2 Fingers	44572	Black	4×
Plate 1 x 10	4477	Black	2×
Technic Axle 3	4519	Light Bluish Gray	4×
Tool Hammer / Mallet Large	4522	Black	1×
Wedge Curved 16 x 4 Triple	45301	Black	6×
Brick Round 1 x 1 with Fins, Open Stud	4588	Dark Bluish Gray	6×
Cone 1 x 1 [No Top Groove]	4589	Trans-Neon Green	6×
Plate Special 1 x 4 Offset with Bar Holes	4590	Dark Bluish Gray	1×
Tap 1 x 1 with Hole in Spout	4599a	Light Bluish Gray	4×
Technic Rotation Joint Ball Loop with Two Perpendicular Pins with Friction	47455	Black	4×
Wedge Curved 4 x 4 No Top Studs	47753	Yellow	6×
Technic Brick Special 2 x 2 with Pin Hole, Rotation Joint Socket	48169	Dark Bluish Gray	2×
Technic Brick Special 2 x 2 with Pin Hole, Rotation Joint Ball Half [Vertical Side]	48171	Dark Bluish Gray	4×
Technic Brick Special 2 x 2 with Pin Hole, with 2 Rotation Joint Sockets	48172	Black	1×
Plate Special 1 x 2 [Side Handle Closed Ends]	48336	Black	1×
Crane Section 4 x 12 x 3 with 8 Pin Holes	52041	Black	1×
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small	53451	Red	10×
Technic Axle and Pin Connector, Perpendicular with Extension	53586	Pearl Light Gray	1×
Arm Mechanical with Clip [Thin Support]	53989	Pearl Light Gray	6×
Technic Axle 8 with Stop	55013	Black	2×
Projectile, Technic Competition Arrow, Liftarm Shaft with Hollow Black Rubber End	57028c01	Red	3×
Large Figure Weapon Claw Blade, Small	57528	Red	2×
Launcher, Technic Competition Cannon Flat Bottom [Complete Assembly]	57796	Dark Bluish Gray	2×
Technic Brick Special 2 x 2 with 10.2mm Balls [Center Mold Indention]	57908	Dark Bluish Gray	1×
Technic Brick Modified 2 x 2 with Solid Ball and Axle Hole	57909a	Dark Bluish Gray	2×
Technic Axle 5.5 with Stop [Rounded Short End]	59426	Dark Bluish Gray	2×
Plate Special 1 x 1 with Clip Horizontal [Thick U Clip]	6019	Light Bluish Gray	2×
Sticker Sheet for Set 7721-1	60491	Unknown	1×
Windscreen 5 x 2 x 1 2/3	6070	Trans-Brown	1×
Windscreen 5 x 2 x 1 2/3	6070	Black	1×
Wave / Flame Rounded with Base Pegs	6126a	Trans-Neon Green	2×
Plate Round 1 x 1 with Solid Stud	6141	Trans-Red	2×
Technic Brick Special 2 x 2 with Ball Socket Reinforced and Axle Hole	62712	Dark Bluish Gray	4×
Technic Axle and Pin Connector Perpendicular	6536	Black	3×
Technic Axle Connector Ridged [with x Hole x Orientation]	6538b	Red	2×
Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots	6558	Black	46×
Technic Axle 3 with Stud	6587	Dark Bluish Gray	8×
Tile 1 x 6 with Groove	6636	Red	1×
Hose, Ribbed 7mm D. 11L / 8.8cm	78c11	Pearl Light Gray	2×

Build DNA

Parts inventory insights for Combat Crawler X2

581 pieces puts this build +87% against the average Exo-Force set and +39% against the average 2007 release.

LEGOEXO-FORCE

Vs average Exo-Force set

+87%+270 parts

This set581

Average set311

Average Exo-Force set: 311 pieces across 30 other sets.

Vs average 2007 set

+39%+163 parts

This set581

Average set418

Average 2007 set: 418 pieces across 165 other sets.

Color profile

14different colors

Dominant color

Black

Black225x

40%

Dark Bluish Gray119x

21%

Light Bluish Gray100x

18%

Red55x

10%

Unique parts

4.1 pieces per unique type

136

Repeat factor

Average pieces per unique type.

Most used part

Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots

46x

Results are based on official LEGO part inventories. Accuracy improves as you confirm set completeness.

This site is not affiliated with or endorsed by the LEGO Group.

Build Insights🧩136unique parts🎨14different colors📊41.5avg. parts per color🏆46×Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots

🎨 All Exo-Force sets 📅 All sets from 2007

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