Lewis
Lewis R2 (2026) 63g Ultra-light Flat Mount Monoblock Brake Caliper
Lewis R2 (2026) 63g Ultra-light Flat Mount Monoblock Brake Caliper
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Lewis R2 Ultra-light Flat Mount Monoblock Brake Caliper
The Lewis R2 is an ultra-light flat mount hydraulic disc brake caliper designed for riders who want lower weight, a cleaner setup, and a more refined braking feel.
Machined from 7075-T6 aluminum bar stock, the R2 uses a one-piece monoblock CNC caliper body to improve structural rigidity while reducing unnecessary material and hardware. Compared with traditional split-body calipers, the monoblock construction uses fewer body bolts, allowing the caliper to be made lighter, smaller, and stronger.
At only approximately 63g per caliper, excluding brake pads and fittings, the R2 is a strong upgrade choice for lightweight road bikes, climbing builds, premium gravel bikes, and custom performance builds.
Key Features
One-piece Monoblock CNC Construction
The R2 caliper is CNC-machined from a single piece of 7075-T6 aluminum. This monoblock design creates a stronger and more rigid caliper body compared with conventional two-piece calipers.
By reducing the number of body bolts and connection points, Lewis is able to remove more unnecessary material from the caliper body while maintaining excellent structural strength. The result is a lighter, more compact, and cleaner-looking brake caliper.
Stronger Caliper Body with Fewer Bolts
A traditional split caliper relies on multiple bolts to hold the two caliper halves together. The R2’s one-piece body reduces the need for extra fastening hardware, helping to save weight and improve overall stiffness.
This also gives the caliper a more premium CNC-machined appearance, making it a suitable choice for high-end custom road and gravel builds.
Reinforced Brake Pad Retaining Pin Area
The R2 features a reinforced brake pad retaining pin interface to improve durability around the pad retention area.
On some ultra-light calipers, the brake pad retaining pin can experience additional stress when the brake lever is held while the bike is pushed backward. Over time, this reverse loading can increase the risk of damage around the retaining pin area.
Lewis has strengthened this section of the R2 caliper to better support the brake pad retaining pin and reduce the risk of pin-related failure under reverse braking loads, workshop handling, and demanding riding conditions.
2 × 21mm Titanium Pistons
The R2 is equipped with two large 21mm titanium pistons for strong and consistent braking performance. The larger piston diameter helps deliver reliable braking force, while the titanium piston material helps reduce weight and improve the overall premium specification of the caliper.
7075-T6 Aluminum Body
The caliper body is machined from high-strength 7075-T6 aluminum, a material commonly used in high-performance cycling components where strength, stiffness, and weight reduction are important.
DOT 5.1 and Mineral Oil Versions Available
The Lewis R2 is available in both DOT 5.1 and mineral oil versions, making it compatible with different hydraulic brake systems.
Please select the correct version based on your existing brake lever and hydraulic system. DOT fluid and mineral oil systems are not interchangeable.
Who Is It For?
The Lewis R2 is suitable for:
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Riders building a lightweight road bike
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Climbers looking to reduce total bike weight
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Gravel riders who want a compact and strong flat mount caliper
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Custom bike builders seeking a premium CNC-machined brake upgrade
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Riders who want a cleaner, smaller, and lighter caliper body
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Users who understand their brake system’s fluid type and compatibility requirements
Specifications
| Item | Specification |
|---|---|
| Brand | Lewis |
| Model | R2 |
| Brake Type | Hydraulic disc brake caliper |
| Mount Type | Flat Mount |
| Flat Mount Size | 34mm |
| Caliper Body | One-piece monoblock CNC construction |
| Material | 7075-T6 aluminum |
| Pistons | 2 × 21mm titanium pistons |
| Fluid Options | DOT 5.1 / Mineral Oil |
| Weight | Approx. 63g |
| Weight Note | Excluding brake pads and fittings |
Compatibility Notes
Please confirm your brake lever, hose, and hydraulic system before ordering.
DOT 5.1 and mineral oil versions are not cross-compatible. Using the wrong fluid type may damage seals and affect braking performance.
This caliper is designed for flat mount frames and forks. Please check your frame, fork, rotor size, and adapter requirements before installation.
User Manual
User Manual
Warranty Information
Warranty Information
Lewis stands by their products and offers a 3-Year Warranty.
What Is Covered By Warranty
Mechanical failures under normal intended use, caused by errors in manufacturing or by early wear and tear of individual components. Mechanical items include lever body, lever, fixings, bolts, caliper, pistons and hoses.
What is NOT Covered By Warranty
- Any failure or damage caused by unintended use of our products, such as an accident, crash or mistreatment of the product.
- Normal servicing/wear and tear parts, for example, bearings and oil seals.
- Incorrect installation, leading to premature wear, damage or corrosion.
How to Claim
Make sure you have the original purchase invoice with date, customer name and order number. Only original owners are eligible for warranty.
Contact our customer service team tipartssg@gmail.com with:
1. Order number
2. Detailed explanation of the problem.
3. Pictures and video to support the claim.
We will contact you within 48 hours.
If not accepted, we will give a clear reason why. We will give you a solution or an alternative method.
If accepted, according to the issue or fault, we will determine whether we send you a replacement part/s or a complete new brake system.
Returns & Refund Information
Returns & Refund Information
We want you to be fully satisfied with your purchase. However, please note that returns and refunds are only accepted for genuine product quality issues, such as cracks or structural breaks.
Issues such as creaking or noise are generally the result of improper installation and are not considered product defects.
Not Eligible for Return or Refund
Returns will not be accepted under the following conditions:
- Improper installation or use
- Normal wear, surface marks, or cosmetic blemishes
- Damage caused by misuse, over-torque, or accidents
- Any modification or alteration of the product
- Products showing signs of use (including clamp or installation marks)
Returns Due to Wrong Model Ordered
If the incorrect model was ordered by you:
- You are responsible for all return shipping costs.
- Once we've received your return, we will refund you the purchase amount less:
- a) Payment gateway fee of 7% (this is what our credit card company charges us)
- b) Shipping costs, even if you received "free shipping", as we subsidise shipping at our own expense.
Additional Notes
- Returned items must be in unused, original condition and complete with all packaging.
- Products showing any signs of installation or use will not be eligible for return.
- If reshipping is required, the reshipping fee will be borne by the buyer.
