16/08/2010
Shimano RS505: A Closer Look at Shimano's Hydraulic Disc Brake Offering
The world of cycling is constantly evolving, and one of the most significant advancements in recent years has been the widespread adoption of hydraulic disc brakes on road bikes. These systems offer superior stopping power, modulation, and all-weather performance compared to traditional rim brakes. Shimano, a leading name in bicycle components, introduced the RS505 groupset to bring hydraulic disc braking to a more accessible price point. This article delves into what you can expect from a Shimano RS505 hydraulic disc brake kit, its features, and how it stacks up against its higher-tier counterparts.
What's Included in a Shimano RS505 Kit?
When you purchase a Shimano RS505 hydraulic disc brake kit, you're typically acquiring the core components needed to upgrade your road bike to hydraulic disc braking. While exact configurations can vary slightly depending on the retailer and specific package, a standard kit will generally include:
- STI Levers (Shifters/Brake Levers): Two RS505 STI levers, one for the front and one for the rear. These combine the gear shifting mechanism with the hydraulic brake lever.
- Hydraulic Disc Brake Calipers: Two hydraulic disc brake calipers, designed to mount onto your frame and fork. These are often available in either Flat Mount or Post Mount configurations, with adaptors sometimes included.
- Hydraulic Hoses: Pre-bled or un-bled hydraulic hoses of sufficient length to connect the levers to the calipers.
- Brake Pads: A set of brake pads, typically resin compound, designed for the RS505 calipers.
- Adaptors: Depending on the specific kit and intended mounting, adaptors for different rotor sizes or frame/fork mounts (e.g., post-mount adaptors for flat-mount calipers) may be included.
It's important to note that rotors are often sold separately, so you'll need to ensure you purchase the correct size and type (e.g., Centerlock or 6-bolt) to match your wheels and intended use.
Key Features and Design of the RS505 Levers
Shimano's RS505 STI levers represent an entry into hydraulic road disc braking. Compared to their higher-end Ultegra R685 counterparts, the RS505 levers have a distinct design:
- Ergonomics: The RS505 levers are generally described as being longer and lower, with a shape that more closely resembles Shimano's traditional cable-actuated levers. This can provide a familiar feel for riders transitioning from cable systems.
- Palming Comfort: A key point of discussion with the RS505 levers is the ergonomic feel in the hand. While some riders find the shape comfortable, others have noted a prominent, square-edged bulge near the bleed port where the base of the palm rests. This can be a divisive feature, and rider comfort can be subjective, heavily influenced by hand size and shape.
- Bleed Port Accessibility: The more accessible bleed port is a practical advantage, making maintenance easier. However, this is also the source of the aforementioned ergonomic bulge.
- Lever Pivot: The lever pivot is positioned slightly further away from the handlebar compared to Ultegra levers.
- Adjustability: Crucially, the RS505 levers still offer essential adjustability, allowing for both reach adjustment (how close the lever is to the bar) and bite point adjustment (when the brakes engage).
Performance and Comparison
When it comes to performance, the Shimano RS505 groupset aims to deliver the benefits of hydraulic disc braking at a more affordable price point. Here's how it compares:
RS505 vs. Ultegra R685
The RS505 shares many performance characteristics with the higher-tier Ultegra R685 system, but with some key differences:
| Feature | Shimano RS505 | Shimano Ultegra R685 |
|---|---|---|
| Lever Material | Alloy | Carbon fibre (levers) |
| Ergonomics | Longer, lower, potential bulge near bleed port | More refined, generally considered more comfortable by many |
| Brake Pad Size | Slightly smaller | Standard |
| Braking Power & Modulation | Very similar to Ultegra R685 | Excellent |
| Heat Dissipation | Includes heat-dumping fins | Includes heat-dumping fins |
| Mounting Options | Flat Mount standard (Post-mount adaptor available) | Post Mount standard (Flat Mount adaptors may be available) |
| Shifting Performance | Precise, smooth, light action (same lever throw as Ultegra) | Precise, smooth, light action |
| Weight (approx. without hoses/pads) | 913g | 886g |
| Price Difference (approx.) | £100 cheaper than Ultegra R685 | Higher |
The RS505 levers are approximately 27g heavier than the Ultegra R685/785 pairing. However, they offer a significant cost saving of around £100, making them a more cost-effective option for those wanting to upgrade to hydraulic disc brakes without the premium price tag of Ultegra.
RS505 vs. 105 Cable Disc Setup
The jump from a 105 cable disc setup to the RS505 hydraulic system is also noteworthy. While cable-actuated disc brakes offer an improvement over rim brakes, hydraulic systems provide a distinct advantage in terms of power and modulation. The RS505 hydraulic system is generally considered worth the additional investment (around £120 more) for its improved control and adjustment-free performance, especially for those who frequently ride in varied weather conditions or tackle long descents.
Mounting Standards: Flat Mount vs. Post Mount
The RS505 levers come with the new road-specific Flat Mount standard as standard. Flat Mount calipers are designed to be more aesthetically integrated with modern road bike frames and forks, offering a cleaner look and often being lighter. However, the kit usually includes a post-mount front adaptor, allowing compatibility with frames and forks that utilize the more traditional post-mount design. It's crucial to identify your frame and fork's mounting standards before purchasing to ensure compatibility.
Important Considerations for Buyers
Given the subjective nature of the RS505 lever ergonomics, it is highly recommended to try before you buy if possible. See if you can test ride a bike equipped with RS505 brakes or try them out at a local bike shop. This will help you determine if the shape suits your hand and riding style. If you're unsure, consulting with a professional bike mechanic can also provide valuable insight into compatibility and fit.
Frequently Asked Questions (FAQ)
Q1: Do I need to buy rotors separately?
Yes, rotors are typically sold separately. Ensure you purchase the correct size and mounting type (Centerlock or 6-bolt) for your wheels.
Q2: Are Shimano RS505 levers compatible with all Shimano drivetrains?
The RS505 levers are designed to work with Shimano 10-speed and 11-speed drivetrains, offering precise gear shifting. However, always check the specific compatibility chart for your exact drivetrain components.
Q3: Can I bleed the RS505 brakes myself?
Yes, the bleed port is designed for easier access, making self-bleeding achievable with the correct Shimano hydraulic mineral oil and bleeding kit. However, if you're not comfortable with the process, it's best to have a qualified mechanic perform the bleeding.
Q4: What is the difference between Flat Mount and Post Mount?
Flat Mount is a newer, more integrated standard for road bikes, often resulting in a cleaner aesthetic and lighter weight. Post Mount is a more established standard, commonly found on mountain bikes and older road bikes.
Q5: Will the RS505 brakes work in all weather conditions?
Yes, hydraulic disc brakes, including the RS505, offer significantly improved performance in wet and muddy conditions compared to rim brakes due to their consistent power and modulation.
In conclusion, the Shimano RS505 hydraulic disc brake system offers a compelling entry point into the world of hydraulic braking for road cyclists. While the ergonomics might be a point of contention for some, the performance benefits, ease of maintenance, and cost-effectiveness make it a strong contender for those looking to upgrade their stopping power and all-weather capability.
If you want to read more articles similar to Shimano RS505: Your Guide to Hydraulic Road Disc Brakes, you can visit the Brakes category.