01
520 Conversion Kits
WR155 / CRF150 packages with ratio options, chain sizing, and fleet-friendly replacement logic.
View focus lineSmall-batch off-road engineering / Dalat, Vietnam
Off-road performance parts engineered for real dirt.
Langbiang Gravity develops, tests, and supplies small-batch performance parts for motocross, enduro, rental fleets, and serious off-road riders.
- 428 to 520
- WR155 / CRF150 conversion focus
- SCM440 / 7075-T6 / Ti-6Al-4V
- Material-led product development
- Shop, fleet, dealer
- Wholesale and custom small-batch supply
Brand position
Not a generic spare-parts shop.
Langbiang Gravity is an engineering-first off-road brand. Product choices start with fitment, material behavior, tooth wear, chain line, heat treatment, and repeated dirt testing, then move into controlled small-batch manufacturing and selected official garage supply.
The goal is simple: parts that feel premium on the bench, survive rental-fleet abuse, and make mechanical sense for Vietnam riding while staying export-ready for Japan, Australia, New Zealand, and global off-road customers.
Product catalogue
Performance parts by system.
Built around drivetrain durability, lighter rotating mass, precise fitment, and parts programs that can scale from one bike to a rental fleet.
02
Front Sprockets
SCM440 steel front sprockets for hard wearing chain contact and controlled fitment.
03
Rear Sprockets
7075-T6 aluminum and steel options for traction, response, and fleet service intervals.
04
Chain Guides
Protection and chain control for mud, rocks, rental use, and aggressive gearing changes.
05
Titanium Bolt Kits
Grade 5 titanium kits for weight control, corrosion resistance, and premium race builds.
06
Brake Rotors
Selected rotor programs for braking bite, heat behavior, and predictable replacement cycles.
07
Garage Essentials
Bearings, fluids, workshop consumables, and official garage parts selected for off-road use.
520 conversion focus
WR155 / CRF150 drivetrain upgrade program.
The 520 conversion line is designed for riders, shops, and fleets that want stronger chain hardware, clearer ratio control, and more predictable drivetrain service in mud and hill-climb use.
WR155 trail
13 / 48
Technical climbs, slow terrain
WR155 mixed
14 / 49
Touring, rental, mixed enduro
CRF150 torque
13 / 50
Low-speed control, mud starts
Custom fleet
By use case
Batch planning by terrain and rider level
Engineering system
Material choice first, marketing second.
Every Langbiang Gravity product line is framed by a technical question: what failure mode are we solving, which material fits that load case, and how do we verify it on actual dirt bikes?
Selected for front sprockets and high-contact wear surfaces that need hard tooth behavior.
Used where reduced rotating mass and premium machining justify the material choice.
Ti-6Al-4V hardware for selected builds where weight, corrosion, and finish matter.
- Heat treatment
- Induction hardening
- CNC machining
- Real-world track testing
- Fitment verification
- Batch traceability
Custom / B2B orders
Build your own small-batch parts program with Langbiang Gravity.
Motorcycle shops
Curated fast-moving fitments, technical display parts, and repeatable wholesale supply.
Rental fleets
Ratio planning, stronger drivetrain packages, service interval logic, and bulk replacement sets.
Race teams
Ratio testing, lightweight hardware, fitment checks, and batch support for event calendars.
Dealers
Private fitments, dealer packs, sample programs, and export-ready product documentation.
Official store preview
Selected official products and garage supply.
The store is structured around fitment confidence, material transparency, and direct B2B quote paths for bulk or custom orders.
Test Lab
Field notes for serious off-road users.
Why convert WR155 from 428 to 520?
Chain strength, sprocket life, mud behavior, and fleet maintenance tradeoffs.
SCM440 vs standard sprocket steel
What alloy selection changes in tooth wear, heat treatment, and service intervals.
How sprocket ratio changes off-road performance
Low-speed control, hill starts, cruising rpm, and rider-level matching.
What makes a good rental-fleet sprocket?
Durability, easy stocking, predictable replacement, and damage tolerance.
Titanium bolts: when they make sense
Where titanium is useful, where steel remains better, and how to avoid bad upgrades.
Contact / quote form
Send a fitment, store, or B2B request.
Include bike model, target use, quantity, and any custom dimensions. For private fitments, attach a drawing, sample photo, or reference measurement.