360901
Steering Block & C-Hub - Aluminum Set
Maximizes steering precision under carpet's high cornering loads.
XRAY XB4 Option Parts
XB4 option & hop-up parts.
Performance upgrade parts for the XB4, 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.
323358
Rear Upright - Aluminum, Extra Low Position
Adds rear-end stability, suited to high-traction conditions.
368054
Shock Caps - Aluminum
Precise oil/bleed control for sensitive high-speed damping.
325220
Rear Drive Shaft - Universal
A freer-moving drivetrain and smoother suspension movement, with reduced maintenance.
361117
Chassis - Steel
More corner speed and stability with a lower center of gravity and less traction roll.
362560
Steering System - Adjustable Multiflex
More steering tuning possibilities.
Astro
Most important for astroturf.
Medium-high, fast-cornering traction that rewards a smoother, more tunable feel.
368054
Shock Caps - Aluminum
Precise oil/bleed control for sensitive high-speed damping.
325220
Rear Drive Shaft - Universal
A freer-moving drivetrain and smoother suspension movement, with reduced maintenance.
361117
Chassis - Steel
More corner speed and stability with a lower center of gravity and less traction roll.
362560
Steering System - Adjustable Multiflex
More steering tuning possibilities.
364904-L
Center Differential
More traction and better bump absorption — must be used together with 364026, 365436, 941015 and 361177.
323525
Wing - Lush Wide
More rear downforce and rear traction.
362234 + 362244
Caster Blocks - Aluminum, 12°
Better bump absorption, more high-speed stability and more mid-corner steering.
Dirt
Most important for loose dirt.
Low, bumpy traction where compliance and mechanical traction matter most.
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.
323525
Wing - Lush Wide
More rear downforce and rear traction.
368054
Shock Caps - Aluminum
Precise oil/bleed control for sensitive high-speed damping.
362560
Steering System - Adjustable Multiflex
More steering tuning possibilities.
362234 + 362244
Caster Blocks - Aluminum, 12°
Better bump absorption, more high-speed stability and more mid-corner steering.
Full Reference
Complete XB4 option parts catalog.
Every hop-up part I consider for the XB4, with a note on the trade-off it makes.
| Part # | Part | Why / trade-off |
|---|---|---|
| 362112-M/H/G | Front Lower Arm - Medium/Hard/Graphite | Sets front-end flex for steering precision vs impact compliance. |
| 363113/114-M/H/G | Rear Lower Arm - Medium/Hard/Graphite | Sets rear-end flex for traction and durability balance. |
| 362251-M/G / 362261 / 360901 | Steering Block - Medium/Graphite (Kit) / Aluminum / Alu+C-Hub Set | Aluminum removes steering flex for maximum precision. |
| 362210-G/220-G / 360901 | C-Hub - Graphite (Kit) / Aluminum Set | Aluminum c-hub removes caster-block flex for sharper steering. |
| 323354/357-H/G/M / 323355/356 / 323358 | Rear Upright - Hard/Graphite/Medium / Aluminum High/Low / X-Low | Sets rear roll center and toe stiffness/durability. |
| 361287-M/H/G | Chassis Brace - Medium/Hard/Graphite | Sets central chassis torsional flex. |
| 361289 / 361192 / 361190 | Chassis Brace/T-Brace - Carbon | Carbon reinforcement replaces composite brace for max stiffness. |
| 361278-M/H/G | Side Guard - Medium/Hard/Graphite | Sets chassis side-rail torsional stiffness. |
| 362575 / 362571-G | Steering Plate - Aluminum / Graphite | Aluminum plate with shims fine-tunes Ackermann and removes flex. |
| 362512 / 362512-G | Servo Saver - Composite / Graphite | Graphite is stiffer for more direct steering force transfer. |
| 362581 | Steering Brace - Carbon | Reinforces the steering-plate/servo mount area. |
| 362091 | Front Shock Tower - Carbon | Sets front shock angle and wing mount position. |
| 363088 / 363089 | Rear Shock Tower - Carbon (3-Dot / 5-Dot) | More holes give finer shock angle adjustment. |
| 968045-T | Shock Standoff - Titanium | Lightweight, high-strength shock-tower post. |
| 365227 / 365241 / 365250 | Front Driveshaft - ECS (Coupling/Axle/Case) | Reinforced coupling for extra durability under hard acceleration. |
| 325341 | Rear Drive Axle - Adjustable | Lets you fine-tune rear driveshaft length/engagement. |
| 365353 - 365361 | Wheel Hub - Aluminum (Various Offsets) | Sets wheel offset/track width. |
| 362481 - 362489 | Anti-Roll Bar - 1.1mm to 2.0mm | Sets front/rear roll stiffness for handling balance. |
| 992380 / 990016/990018 | Turnbuckle / Ball Stud - Titanium | Lightweight, low-friction linkage hardware. |
| 326181 | Battery Weight - Stainless Steel 35g | Ballast for weight-distribution tuning. |
| 364160 | One-Way Adjustment Screw | Tunes slipper one-way clutch tightness for corner-exit bite. |
Part numbers reference official XRAY option parts codes — always double-check current codes against XRAY's official parts list before ordering.