320904
Steering Block & C-Hub - Aluminum Set
Maximizes steering precision under carpet's high cornering loads.
XRAY XB2 Option Parts
XB2 option & hop-up parts.
Performance upgrade parts for the XB2, with notes on why each one is worth running and under which track conditions it helps most.
Carpet
Most important for high-traction carpet.
The upgrades that matter most once cornering loads and traction levels are at their highest.
322516
Steering Arm - Aluminum
Improves steering response and feel with a more rigid connection.
322575
Steering Plate - Aluminum
Improves steering response with a more precise feel.
323356
Rear Upright - Aluminum, Low Position
Adds rear-end stability, suited to mid-to-high traction conditions.
368054
Shock Caps - Aluminum
Precise oil/bleed control for sensitive high-speed damping.
322316
Front Lower Arm Mount - Aluminum
Adds rigidity and front-end stability.
321255-G
Side Brace - Graphite
Adds stability and corner speed on high-traction surfaces (more corner speed, less generated mechanical traction).
325220
Rear Drive Shaft - Universal
A freer-moving drivetrain and smoother suspension movement, with reduced maintenance.
321128-N
Chassis - Steel
More corner speed and stability with a lower center of gravity and less traction roll.
Astro
Most important for astroturf.
Medium-high, fast-cornering traction that rewards a smoother, more tunable feel.
325003
Ball Differential
Adds traction on lower-traction astro surfaces.
322117/127-M
Short Front Arm - Medium
Better bump absorption and more traction.
363114/124-M
Rear Arm - Medium
Better bump absorption and more traction.
326181
Weight - Steel 35g
More stability at high speed and over bumps.
368054
Shock Caps - Aluminum
Precise oil/bleed control for sensitive high-speed damping.
322316
Front Lower Arm Mount - Aluminum
Adds rigidity and front-end stability.
325220
Rear Drive Shaft - Universal
A freer-moving drivetrain and smoother suspension movement, with reduced maintenance.
Dirt
Most important for loose dirt.
Low, bumpy traction where compliance and mechanical traction matter most.
322117/127-M
Short Front Arm - Medium
Better bump absorption and more traction.
323113/123-M
Rear Disengaged Arm - Medium
A shorter effective wheelbase that generates more rear traction.
323355
Rear Upright - High Position
A lower roll center for more rear traction; aluminum construction adds stability.
326181
Weight - Steel 35g
More stability at high speed and over bumps.
323525
Wing - Lush Wide
More rear downforce and rear traction.
368054
Shock Caps - Aluminum
Precise oil/bleed control for sensitive high-speed damping.
Full Reference
Complete XB2 option parts catalog.
Every hop-up part I consider for the XB2, with a note on the trade-off it makes.
| Part # | Part | Why / trade-off |
|---|---|---|
| 321124 / 321122 | Chassis - Aluminum (2.5mm Kit / 2.0mm Thin Option) | Thinner chassis adds flex for more mechanical traction; kit thickness is stiffer and more precise. |
| 321255 / 321255-G | Side Brace - Composite (Kit) / Graphite | Graphite stiffens the chassis side rail for sharper steering response; these are the only two material options available. |
| 322117-H / 322113-M/H/G | Front Arm - Short Hard (Kit) / Long Medium-Hard-Graphite | Arm length and hardness set steering feel and impact durability. |
| 363114-H/G / -M | Rear Arm - Hard/Graphite (Kit) / Medium Option | Softer arm flexes for more compliance and mechanical traction. |
| 323113-M/H/G / 323123-M/H/G | Rear Arm - Disengaged (Medium/Hard/Graphite) | Alternative rear-arm design (vs. the standard 3-hole arm above) that changes how the arm loads the diff pod, giving a different mechanical-traction character. |
| 322250-G / -M/-H | Steering Block - Graphite (Kit) / Medium-Hard Option | Stiffer block sharpens steering response, softer adds compliance. |
| 320904 | Steering Block & C-Hub - Aluminum Set | Removes all front-end steering flex for maximum precision on high-traction surfaces. |
| 322210-G/220-G / -M/-H | C-Hub - Graphite (Kit) / Medium-Hard Option | Sets front kingpin stiffness, affecting steering precision vs compliance. |
| 322315 / 322316 / 322317 / 322312 | Front Lower Arm Mount - Composite 0° (Kit) / Alu 0° / Alu +3°/-3° / Brass 0° | Aluminum removes flex for precision; the adjustable +3°/-3° version lets you change front kick-up angle; brass adds low, forward ballast weight. |
| 322515 / 322516 | Steering Arm - Composite (Kit) / Aluminum | Aluminum steering arm removes flex for more direct steering response. |
| 322574-G / 322575 | Steering Plate - Graphite (Kit) / Aluminum | Aluminum plate with shims fine-tunes Ackermann and removes flex. |
| 323357-G / 323354-M/H | Rear Upright - Graphite (Kit) / Medium-Hard Option | Sets rear toe/roll-center stiffness and impact durability. |
| 323356 / 323358 | Rear Holder - Aluminum High / Low | Adjusts rear roll-center height for tuning rotation and traction. |
| 324016-L / 324017 | Motor Plate - Aluminum (Kit) / Carbon LCG | Carbon low-CG plate lowers weight placement for better handling. |
| 324955 / 324955-G | Gear Diff Case - Composite (Kit) / Graphite | Graphite case is lighter and stiffer for gear-diff-equipped cars. |
| 930120 / 930220 | Diff Balls - Carbide (Kit) / Ceramic | Ceramic balls reduce friction for smoother ball-diff feel. |
| 325003 | Ball Diff Set - Adjustable LCG | Complete low-center-of-gravity ball-differential upgrade for a smoother, more tunable diff feel than the standard setup. |
| 323490 - 323496 | Anti-Roll Bar - 1.0mm to 1.6mm | Thinner bar softens rear roll stiffness for more rear traction; thicker firms it up. |
| 368021 - 368028 | Shock Spring Collar - Aluminum (Various Offsets) | Fine-tunes ride height and spring preload beyond the kit composite collar. |
| 368033 / 368034 | Shock Piston - Precision Blanks 2.0mm/2.5mm | Custom-drilled pistons let you fine-tune damping beyond the kit piston set. |
| 368054 | Shock Cap-Nut - Aluminum | Precise bleed/oil control for consistent high-speed damping. |
| 326178 | Battery Backstop - Carbon | Lighter, stiffer battery retention than the kit part. |
| 326181 | Battery Weight - Stainless Steel 35g | Ballast to fine-tune weight distribution/balance. |
Part numbers reference official XRAY option parts codes — always double-check current codes against XRAY's official parts list before ordering.