Grind 431™ LCG OD Transmission
Key Features
- Super light & super low LCG design
- 31% sweet spot overdrive
- Lightened & hardened custom chromoly gears
- 2.5mm Toray® premium high-grade graphite motorplate
- Ultra light high-tech nylon polymer housing
- Custom stainless steel shafts
- High-performance & durable bearings
- Carefully engineered gear ratios
- Dedicated C23 V1/V2/V2R, 6º re-angled and straight skid options
- All-made in Europe
Champion Proven Performance
The amazing performance of the Grind 431™ LCG OD Transmission has been tested and proven for 6 months by PROCRAWLER® Factory Driver Massimo “Max” Bonvini.
Max’s Featured Track Records:
- 2019 European Scaler Extreme Champion
- 3x Italian Scaler Extreme Champion
- Moab Extreme Challenge Champion
- 4x Lombardy Regional SORRCA Champion
- 5x Piemonte Regional SORRCA Champion
Super Light & Super Low LCG Design
The primary goal with the Grind 431™ LCG OD Transmission was to create the lightest and lowest LCG transmission in its class.
| Net weight | 64g |
| Net weight /w skid | 95g |
| Housing height /wo insert hub | 31mm |
| Motorplate height | 35mm |
31% Sweet Spot Overdrive
We at Team PROCRAWLER® spent tons of wheel hours on the rocks putting our Flatgekko™ rigs in work and found 31% as the sweet spot when it comes to overdrive rate.
That’s why we designed the Grind 431™ LCG OD Transmission around this magical value and implemented 31% overdrive in it.
Lightened & Hardened Custom Chromoly Gears
After long months of research we haven’t found the proper gears for the Grind 431™ LCG OD Transmission so we decided to design and manufacture the perfect gearing on our own.
The all-new lightened gear design and the hardened chromoly material together make the Grind 431™ gearing super light, strong and durable while the M0.5 modulus teeth ensure ultra smooth running.
2.5mm Toray® Premium High-Grade Graphite Motorplate
When we compiled the product features list of the Grind 431™ LCG OD Transmission it was not a question to use the ultimate Toray® premium high-grade graphite material for the motormount plate.
Toray® premium high-grade graphite, this high-end quality carbon is ultra light but still super strong as we already experienced at the C23 V2/V2R chassis rails, all in all the perfect motorplate material.
Ultra Light High-Tech Nylon Polymer Housing
Crafting the lightest but still powerful LCG OD transmission in its class requires careful engineering when it comes to materials.
That’s why we decided to use the super light and rock solid PA12 high-tech nylon polymer paired with the high-end SLS (Selective Laser Sintering) 3D printing technology for the housing of the Grind 431™ LCG OD Transmission with metal inserts for long lasting threads.
Custom Stainless Steel Shafts
Smooth running depends on several elements of a competition level LCG transmission. One of them are the properly designed and manufactured shafts.
We engineered the perfect custom stainless steel shafts for the Grind 431™ LCG OD Transmission to support its butter smooth running on a long term basis.
High-Performance & Durable Bearings
We have looked into and tested dozens of bearings until we found the perfect ones for the Grind 431™ LCG OD Transmission.
The high-performance and durable oiled Grind 431™ stainless steel bearings run smooth like a breath of fresh air but are resistant to dust and mud.
Carefully Engineered Gear Ratios
Gear ratios must be carefully engineered fitting the purpose of use.
We have spent months doing the maths homework and defined the gearing of the Grind 431™ LCG OD Transmission to fit the needs of pro scale rock crawling perfectly.
| Front Transmission Output Ratio | 1.83:1 |
| Rear Transmission Output Ratio | 2.50:1 |
Dedicated C23 V1/V2/V2R, 6º Re-Angled & Straight Skid Options
The Grind 431™ LCG OD Transmission is a seamless fit for the C23 V2R LCG Chassis System for sure but was designed to also fit any chassis rails no matter if having angled or straight skid.
That’s why the Grind 431™ is available with C23 V2R, 6º re-angled and straight skid options. Feel free to take your choice!
Made In Europe
The Grind 431™ LCG OD Transmission is designed in-house by the engineering artists of Team PROCRAWLER® in Hungary/Europe.
High-quality production is processed on state-of-the-art Hungarian and Italian 3D printers and CNC machines so the Grind 431™ is crafted of the finest that the EU has.
Tech Specs
| Grind 431™ Dimensions |
|---|
| Length: 18mm |
| Width: 87mm |
| Housing height /wo insert hub: 31mm |
| Motorplate height: 35mm |
| Bearings size: 5x10x4mm flanged |
| Shaft diameter: 5mm |
| Grind 431™ Weight |
|---|
| Net weight: 64g |
| Net weight /w skid: 95g |
| Grind 431™ Overdrive |
|---|
| 31% Front Overdrive |
| Grind 431™ Front Transmission Output Ratio |
|---|
| 1.83:1 |
| Grind 431™ Rear Transmission Output Ratio |
|---|
| 2.50:1 |
| Grind 431™ Front Transmission Output Ratio /w Final Drive |
|---|
| 11.40:1 /w 9T/56T Pinion/Spur |
| 7.90:1 /w 13T/56T Pinion/Spur |
| 6.04:1 /w 17T/56T Pinion/Spur |
| Grind 431™ Rear Transmission Output Ratio /w Final Drive |
|---|
| 15.55:1 /w 9T/56T Pinion/Spur |
| 10.77:1 /w 13T/56T Pinion/Spur |
| 8.24:1 /w 17T/56T Pinion/Spur |
| Grind 431™ Front Drive Ratio |
|---|
| 42.78:1 /w 9T/56T Pinion/Spur + AR44/AR45/Enduro Axles Or Clone |
| 46.79:1 /w 13T/56T Pinion/Spur + AR45P/Capra/F10 Axles Or Clone |
| 42.93:1 /w 17T/56T Pinion/Spur + TRX-4 Axles Or Clone |
| Grind 431™ Rear Drive Ratio |
|---|
| 58.33:1 /w 9T/56T Pinion/Spur + AR44/AR45/Enduro Axles Or Clone |
| 63.80:1 /w 13T/56T Pinion/Spur + AR45P/Capra/F10 Axles Or Clone |
| 58.55:1 /w 17T/56T Pinion/Spur + TRX-4 Axles Or Clone |
| Grind 431™ Materials |
|---|
| PA12 housing 3D printed by SLS (Selective Laser Sintering) |
| 2.5mm Toray® premium high-grade graphite motorplate |
| Hardened chromoly gears |
| Stainless steel shafts |
| Stainless steel oiled bearings |
| Stainless steel hardware |
Grind 431™
The ultimate LCG OD transmission for taking your scale rock crawling to the highest level.
169.95€Select options
Grind 431™ Spare Parts
Pro scale rock crawling may eat your stuff. We are here for you.
Frequently Asked Questions
What is an LCG OD transmission?
To understand the essence of an LCG OD transmission for scale rock crawling first we have to define what LCG and OD are.
What is LCG?
The LCG stands for “low center gravity”. This is a build style, a way of thinking in the scale rock crawler scene. The key focus in LCG is on getting the center of gravity as low as possible which makes your rig more capable when it comes to climbing upwards, sidehilling or downwards.
Based on these the optimal LCG transmission is as light and as low as possible. Recent stage the Grind 431™ LCG OD Transmission is the lightest and lowest LCG transmission in its class with 31mm housing height and 64g net weight.
What is OD?
The OD stands for “overdrive”. Overdrive is a solution to drive one of the axles faster than the other. In scale rock crawling the basic goal is having the proper front overdrive which means that the front wheels are rotating faster than the rear ones.
We at Team PROCRAWLER® spent tons of wheel hours on the rocks putting our Flatgekko™ rigs in work and found 31% as the sweet spot when it comes to overdrive rate.
That’s why we designed the Grind 431™ LCG OD Transmission around this magical value and implemented 31% overdrive in it.
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Why are weight and height so important?
If you want to keep the COG (center of gravity) of your scale crawler rig as low as possible it is critical how much weight you add above the chassis rail lines.
As center positioned transmissions are mounted on the skid of your rig, it is very important to have it as light and as low as possible to minimize the weight above the chassis rails.
Recent stage the Grind 431™ LCG OD Transmission is the lightest and lowest LCG transmission in its class with 31mm housing height and 64g net weight.
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What chassis rails is the Grind 431™ compatible with?
We designed and engineered the Grind 431™ LCG OD Transmission to be compatible with all major performance chassis rails available on the market. As it comes with its dedicated skid the only requirement is having the market standard skid mounting hole pattern on your rails.
Of course, the most seamless fit is the geometry of the Flatgekko™ C23 V2R LCG Crawler Chassis System. If high-performance is a key focus for you, this pro level pairing will be a blast for you and your scale rock crawling experience.
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Grind 431™ LCG OD Transmission ➝
Flatgekko™ C23 V2R LCG Chassis Kits ➝
What axles to choose for the Grind 431™?
We designed and engineered the Grind 431™ LCG OD Transmission to be compatible with all major capable axles available on the market:
- AR44 axles and their clones
- AR45 straight axles and their clones
- Enduro axles and their clones
- AR45P portal axles and their clones
- Capra portal axles and their clones
- F10 Phoenix portal axles and their clones
- TRX-4 portal axles and their clones
IMPORTANT!
The different axles may require different motor gearing (pinion and spur gears) to get the proper performance on the rocks. You can find detailed informations about motor gearing and recommended pinion/spur pairings in the What size pinion and spur to use for the Grind 431™? section.
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What size pinion and spur to use for the Grind 431™?
The different axles may require different motor gearing (pinion and spur gears) to get the proper performance on the rocks.
We collected the recommended motor gear pairings and gear ratios for all major capable axles available on the market below.
IMPORTANT!
As all scale crawler setups differ, these are only recommendations which doesn’t mean that you can’t follow your own ideas and experience. You want to test out the best setup for you and your driving style.
| Grind 431™ Front Drive Ratio |
|---|
| 42.78:1 /w 9T/56T Pinion/Spur + AR44/AR45/Enduro Axles Or Clone |
| 46.79:1 /w 13T/56T Pinion/Spur + AR45P/Capra/F10 Axles Or Clone |
| 42.93:1 /w 17T/56T Pinion/Spur + TRX-4 Axles Or Clone |
| Grind 431™ Rear Drive Ratio |
|---|
| 58.33:1 /w 9T/56T Pinion/Spur + AR44/AR45/Enduro Axles Or Clone |
| 63.80:1 /w 13T/56T Pinion/Spur + AR45P/Capra/F10 Axles Or Clone |
| 58.55:1 /w 17T/56T Pinion/Spur + TRX-4 Axles Or Clone |
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Which skid option to choose for the Grind 431™?
You can pick your Grind 431™ LCG OD Transmission with 2 skid options.
C23 V1/V2/V2R Skid
This is basically the dedicated skid for the Flatgekko™ C23 V2R LCG Crawler Chassis System chassis kits. This option is your choice if you plan to place the Grind 431™ transmission on a C23 V1/V2/V2R platform.
6º Re-Angled Skid
The 6º Re-Angled Skid can be used for any chassis rails that has the market standard skid mounting hole pattern and an angled skid line. The final positioning of the Grind 431™ transmission will be horizontal if the skid angle is 6º.
Straight Skid
The Straight Skid is your choice if you plan to use the Grind 431™ with a straight skid chassis.
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Grind 431™ LCG OD Transmission ➝
Flatgekko™ C23 V2R LCG Chassis Kits ➝
What is included in the box?
We designed the Grind 431™ LCG OD Transmission as a plug’n play product. That’s why we ship them fully assembled, waterproof greased with G2 Waterproof Premium Graphite Silicone Grease, mounted on the skid and placed on a foam insert in its badass black laser engraved box.
IMPORTANT!
At recent stage motor gears like pinion and spur are not included.
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