Seka Spear RDC Frame
Advanced engineering, elite materials, uncompromising performance
The Seka Spear RDC frame is born from the concept of “Sectionalized Design”, an advanced design approach that, combined with advanced materials, scientific analysis, and ultra-precise manufacturing processes, guarantees uncompromising performance in every aspect.
During development, 37 optimization iterations were carried out, with the constant integration of CFD (Computational Fluid Dynamics) analysis throughout the entire design process. Every detail was validated through repeated tests in the SILVERSTONE wind tunnel, ensuring that every design choice was supported by scientific data and engineering innovation.
The Spear RDC frame marks a turning point in materials science thanks to the pioneering introduction of ultra-high modulus Pitch-based carbon fiber, used for the first time in the road bike sector. However, exceptional materials alone are not enough: for this reason, Seka has developed an exclusive combination of manufacturing technologies.
The True-One-Piece Molding Technology, the use of PMI foam core, and the optimization of FAW69 (Fiber Area Weight) allow for maximum exploitation of carbon properties, improving stiffness, comfort, and lightness. The result is an extremely high-performance frame, designed for demanding cyclists and high-level racing use.
Product Highlights
Sectionalized Design for optimized performance in every area of the frame
Wind Eye Design, a distinctive aerodynamic element that defines the character of the Spear
23% increase in vertical compliance, for greater comfort and control
True-One-Piece Molding Technology for greater structural stiffness and significant weight reduction
Raw frame weight: 685 g ±35 g
Compatible with the new integrated Rapier handlebar, for maximum benefits in control and aerodynamics
Threaded BSA bottom bracket, for reliability, ease of maintenance, and compatibility
Integrated handlebar pairing by frame size
The Seka Spear RDC frame is configured with the Seka RDC integrated handlebar, optimized to ensure ideal position, control, and aerodynamics based on the frame size:
Size S: integrated handlebar Seka RDC 375 / 400 – 90 mm stem
Size MR: integrated handlebar Seka RDC 395 / 420 – 100 mm stem
Size LR: integrated handlebar Seka RDC 375 / 400 – 100 mm stem
Note
Technical specifications may change without notice depending on component availability.
Product images are for illustrative purposes only and may not exactly reflect the described features.
The Seka Spear RDC is the meeting point of science, speed, and absolute control.
Do you want to receive your bike ready for use? Don't forget to add the bike assembly service at the time of purchase! Discover all the details here: Francesconi bike assembly
A Complete Guide to Bike Sizes
Foreword: Not all bike sizes are the same
Each type of bike has a specific frame and often uses a different size scale. For example, a road bike with a 54cm frame might be considered a medium size by one brand, but a large by another.
Bicycle adjustment margins
Some types of bikes, like gravel bikes, offer a wide range of adjustments, adapting to different body types. Other models, however, have limitations in this regard. This is an important aspect to consider.
How to use size charts
We've created a simple guide to help you find the right bike size:
- Check out our size charts for each bike type.
- Learn more with specific tips to help you make the right choice.
Size Charts: Find Your Perfect Bike
Gravel and road bikes
Sizes are based on the length of the top tube (in cm), which determines the reach of the bike.
| Cut
|
Recommended height
|
Horizontal tube length
|
| XS |
Up to 157 cm |
48-50 cm |
| S |
157-167 cm |
50-53 cm |
| M |
168-178 cm |
53-56 cm |
| THE |
178-185 cm |
56-58 cm |
| XL |
Over 185cm |
58-62 cm |
For gravel, measurements may vary slightly due to different geometries, but remain similar.
Mountain bike
MTBs are measured in inches, based on the seat tube.
| Cut
|
Recommended height
|
Size (in inches)
|
| XS |
Up to 157 cm |
14"-16" |
| S |
157-167 cm |
15"-17" |
| M |
168-178 cm |
16"-19" |
| THE |
178-185 cm |
18"-20" |
| XL |
Over 185cm |
20"-23" |
Sizes also vary depending on the type of MTB: full-suspension , hardtail or fat bike .
Children's bikes
The size depends on the size of the wheels, often associated with age:
| Age
|
Wheel Size
|
| 1-3 years |
12" |
| 2-4 years |
14" |
| 4-6 years |
16" |
| 5-8 years |
20" |
| 8-10 years |
24" |
| Over 10 years |
26"/27.5" |
What to do with half measures?
If you are between two sizes:
-
Comfort : Choose the larger size.
-
Performance : Go for the smaller size.
Final tips for choosing
-
Consult the manufacturer's instructions : Always check the brand's guidelines.
-
Ask an expert : a specialized workshop can help you choose based on your height, ideal reach and goals.
-
Test the bike : If possible, test the model you intend to purchase.
