Upside down forks

Types of Upside Down Forks

Upside-down forks are often used in motorcycles and bicycles for suspension. As the name suggests, the tubes of the forks are turned upside down. This modification helps improve the motorcycle's stability and gives the rider better control of the motorcycle.

There are three main types of upside-down forks. They include:

• Conventional Forks

  Conventional forks are one of the most popular types of forks used in bicycles and motorcycles. The design of this fork is simple, which makes it easy to use and maintain. Since the fork blades are parallel, it is easy to insert wheels and remove them when changing flat tires. However, the conventional fork suffers from one drawback. The blades tend to flex and bend sideways, affecting the rider's balance and stability when riding the bicycle.

• Triple Tree Forks

  They are also known as triple clamp forks. They are more common in motorcycles than bicycles. The triple tree fork connects the front fork tubes of the bicycle or motorcycle to the frame. The triple tree fork has two clamps. One clamp holds the fork tube, while the second clamp holds the handlebar. The triple tree fork provides riders with better control of the bicycle or motorcycle, especially during sharp turns.

• Single-Sided Forks

  Single-sided forks are another type of upside-down fork. However, they are less common in bicycles and motorcycles. As the name suggests, the front wheel of the bicycle or motorcycle is attached to the fork with one side. This design helps improve the rider's balance and stability, especially when the rider is accelerating. However, the single-sided fork can make changing the tire more complicated since the brake disc and caliper are mounted on the same side as the fork.

Specifications and Maintenance of Upside Down Forks

Any serious buyer of upside down forks needs to know the specifications and how to maintain them. Below is a detailed look at both components:

Specifications

• Diameter:

  The tubes of the forks usually have a diameter ranging from 38 mm to 60 mm (1.5 to 2.4 in). The exact measurement depends on the size of the motorcycle and the riding style.

• Material:

  It is the same as the regular forks. The forks tubes and the legs are usually made of steel or aluminum alloy. The springs and dampeners are made of steel.

• Travel:

  The distance the fork tubes slide up and down is referred to as travel. This measurement can be anything between 120 mm and 300 mm (4.7 to 11.8 in). The travel distance depends on the motorcycle's size and the type of riding.

• Preload adjustment:

  Some models have preload adjusters at the top of the fork tubes. These adjusters allow riders to change the preload on the springs. This ensures the motorcycle handles well, regardless of load.

• Rebound adjustment:

  Some upside-down forks come with rebound adjusters located at the bottom of the fork legs. This feature enables the rider to change the rebound damping of the fork.

• Compression damping:

  The compression dampening system controls the amount of force needed to compress the fork during bumps and obstacles. The compression dampening system is found inside the fork legs.

• Spring rate:

  Spring rates typically range from 0.6 to 1.2 kg/mm. The spring rate determines the stiffness of the springs inside the fork tubes. Stiffer springs are ideal for heavy riders or those who ride with a load.

• Oil weight:

  The oil used in the forks plays a significant role in lubrication and damping. The oil weight ranges from 5 to 20 cSt (centistokes), depending on the motorcycle's size and the rider's preference.

Maintenance

• 1. Cleaning the forks:

  After every ride, especially in muddy or wet conditions, the forks should be cleaned. This prevents the build-up of dirt, which can damage the seals and cause the forks to malfunction.

• 2. Checking the oil level:

  Every month, the oil level in the fork tubes should be checked. This should be done while the motorcycle is standing upright. Topped up if the oil level is below the recommended level.

• 3. Oil change:

  After every 5,000 km (3,100 miles), an oil change should be done. The oil should be drained from the fork tubes, and the new oil should be poured in. This ensures smooth operation of the forks.

• 4. Replace seals:

  Once in a while, the seals on the fork tubes should be inspected. If any signs of wear or damage are detected, the seals should be replaced. This prevents oil leaks and ensures the forks function optimally.

• 5. Preload adjustment:

  Before every ride, the preload on the springs should be checked. Depending on the load, the preload should be adjusted to suit the riding conditions.

• 6. Inspect the forks:

  Every 10,000 km (6,200 miles), the forks should be removed from the motorcycle. A visual inspection should be done to detect any signs of damage or wear. If any parts are damaged, the forks should be serviced by a qualified mechanic.

How to choose upside down forks

When buying upside-down forks for sale, customers should consider the following factors:

• Rider's Weight and Riding Style

  The rider's weight and riding habits affect the fork's spring and damping settings. Heavier riders may select forks with stronger springs. Buyers should select forks that complement their riding style, whether focused on performance or comfort.

• Motorcycle Type and Usage

  Different types of motorcycles, such as sportbikes, cruisers, or adventure bikes, have varied suspension needs. For example, sportbikes require firmer forks for high-speed stability, while cruisers prioritize a comfortable ride. Additionally, the intended use of the motorcycle, such as street riding, off-road riding, or track performance, influences the fork selection.

• Riding Conditions

  Consider the typical riding conditions, such as urban, rural, or track conditions. Urban riders may prioritize quick adjustments for varied road conditions, while track riders need precision and stability at high speeds.

• Brand Reputation and Reviews

  Research well-known fork brands with positive reviews. Experienced riders give honest feedback about the performance, durability, and support of different fork brands and models.

• Budget

  Set a budget for the fork purchase and consider the long-term benefits of each option. While budget-friendly forks may have lower initial costs, premium forks offer better performance and durability, saving money over time.

• Weight

  Some buyers may prefer lighter forks for better handling and acceleration. However, stability and durability may suffer in lightweight forks with low weight.

• Adjustability

  If riders need to change the suspension settings for different conditions or prefer more control over the fork's performance, consider forks with adjustable preload, compression, and rebound settings.

• Spring Type

  Buyers can choose between coil springs and air springs. Coil springs are more common and provide consistent performance. Air springs are lighter and offer adjustability but need more maintenance.

How to diy and replace upside down forks

Replacing and repairing the forks of a bicycle can be a daunting task. However, with the right tools and some mechanical knowledge, this can be done. The following are the steps to follow when replacing or repairing a bicycle fork:

First and foremost, before any repairs or replacements are made, it is important to ensure that the bicycle is clean.

• 1. To replace an upside-down fork, disassemble the front wheel and brake system.
• 2. Remove the handlebar stem and loosen the headset to take out the old fork.
• 3. Once the old fork is removed, install the new fork by putting together the headset and tightening it.
• 4. Reassemble the handlebar stem, brake system, and front wheel once the new fork is installed.
• 5. Finally, ensure that all components are well adjusted and tightened before riding the bicycle.

It is important to note that different bicycles may have different upside-down fork sizes and installation procedures. Always refer to the manufacturer's manual for specific instructions.

Q and A

Q1: Why do people use upside down forks?

A1: The main advantage of using inverted forks is that they offer better suspension performance and a smaller profile, which improves the bike's handling. The downside of inverted forks is that they are more expensive than conventional forks. They also require more maintenance and are more difficult to repair when damaged.

Q2: Are upside down forks better?

A2: Many people believe that upside-down forks are better than conventional forks. However, this is not true. Both types of forks have their advantages and disadvantages. As mentioned earlier, upside-down forks offer better suspension performance. They also provide a more stable front wheel, which improves the bike's handling. On the other hand, conventional forks are cheaper and easier to maintain.

Q3: Can any bike be converted to upside-down forks?

A3: Inverted forks can be fitted to most bicycles. However, this will require some modifications to be done. The modifications will increase the cost of converting a conventional fork to an upside-down fork.

Q4: Do upside-down forks need to be bled?

A4: Yes. Like any other type of fork, upside-down forks need to be bled when air becomes trapped in the oil. Failing to bleed the forks can affect the performance of the bike.