An entry-level aluminum road bike that's a great deal as part of a limited stock sale! Introducing POLYGON's "STRATTOS S3"!
With Shimano SORA grade components, it offers great value at 87,945 yen!
Recently, major brands like GIANT and TREK have been reducing their rim brake model lineups, meaning there are fewer "just right price range" options for beginner-friendly complete bikes.
In this context, models like the STRATTOS S3, which have a solid build at a suppressed price, are incredibly valuable.
For anyone looking to start road biking, this might be the last chance to get this grade at this price!
POLYGON STRATTOS S3

【Manufacturer's Suggested Retail Price】¥135,300 (tax included) ⇒ SALE! ¥87,945 (tax included) *Limited stock
【Colors (2 total)】Orange, Charcoal
【Sizes (approx. height guide)】S (162-170cm), M (168-176cm), L (174-181cm)
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What is POLYGON BIKES?

Before introducing this road bike, many of you might not know what "Polygon Bikes" is, and you might even mistakenly think that the "STRATTOS S3" I'm about to introduce is a cheap, mass-produced bike 💦
POLYGON BIKES is a sports bicycle brand based in Indonesia.
Originally, it was a bicycle OEM company called Insera Sena (a company that manufactures for other brands), and it has supported many famous brands.

*This image is for illustrative purposes only.
While I can't reveal their specific achievements, which is a pity, they have worked with brands well-known to cycling enthusiasts and widely distributed in Japan.
Furthermore, it is Indonesia's largest manufacturer, boasting an annual production capacity of over 1 million units and advanced technical capabilities and facilities in every process, including welding, painting, assembly, and quality control.

POLYGON BIKES is the original brand of Insera Sena.
POLYGON BIKES is characterized by tough, high-quality frames, and is particularly highly regarded for its cost performance in bikes designed for hard riding, such as MTBs.
Lightweight & Comfortable! A Thorough Review of the STRATTOS S3 Frame Performance

The STRATTOS S3 is an entry-level aluminum road bike designed as a "first road bike."
The Charm of the Charcoal Color: Where Seriousness Meets Playfulness
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The Charcoal color of the STRATTOS S3 presented here features a subdued and calm gunmetal base, impressively adorned with a blue camouflage-like design on the inner side of the frame.
Frame Geometry

| Frame Size | 460(S) | 490(M) | 520(L) |
| HA | 70.5 | 71 | 72 |
| SA | 74.5 | 74 | 73.5 |
| TT | 525(S) | 540(M) | 555.7(L) |
| HT | 120 | 140 | 160 |
| FC | - | - | - |
| RC | 415 | 415 | 415 |
| BB | 75 | 75 | 75 |
| FO | - | - | - |
| WB | 994.3 | 1001.1 | 1003.1 |
| SH | 708 | 736 | 764 |
| SK | 520 | 540.5 | 563.1 |
| RH | 381 | 385 | 389 |
| Applicable Height | 162~170(S) | 168~176(M) | 174~181(L) |
The geometry features a low center of gravity and a slightly longer wheelbase, adopting a design that offers stability and is easy for beginners to handle.

While the head tube length is slightly shorter, there's ample room for the steerer tube, allowing for an upright riding position as well.
Tube shape designed for vibration absorption, gentle even for beginners
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The frame tubing is shaped with a "flat top, round bottom" design, reminiscent of a Kamm tail. This shaping is intended to reduce aero drag and absorb vibrations from the ground.
The thin wall thickness of the tubing is also a welcome feature, contributing to its lightweight design.

The cables are internally routed within the frame.
Excellent Handling! Lightweight Carbon Fork with Superior Vibration Absorption

The front fork features an aluminum-steerer carbon fork, balancing lightness with durability.
Surprising Perfection at this Price Point! Ideal Finish for an Entry-Level Road Bike
Considering the entire frame, given that Insera Sena established its original brand with full confidence, I believe it has achieved a cost-effective finish as an entry-level model!
Specs Beyond Its Price! Checking the STRATTOS S3 Component Configuration
Reliable Shimano SORA Equipped! Perfect for Your First Road Bike ◎

The main groupset is Shimano SORA (2x9 speed).
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With other brands in the same spec range, the crankset is often one grade lower, but the STRATTOS S3 consistently features SORA grade components.
Comfort-Oriented 700x28c Tires! Perfect for City Riding to Cycling
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It comes standard with 700x28c slick tires and popular aluminum wheels.
Uncompromising Stopping Power! Caliper Brakes for Easy Maintenance

The brakes are TEKTRO caliper brakes.
If you're thinking of challenging yourself with long-distance cycling or hill climbs in the future, we recommend upgrading the wheels and brakes!
Standard Pedals Included! Ready to Ride Immediately After Purchase

Aluminum flat pedals are included as standard equipment.
Specifications Table
| Tire Size | 700x25C | |
| Speeds | 2x9 speed | |
| Pedals | None | |
| Specs | Frame | ALX ALL-ROUND |
| Fork | LIGHT WEIGHT CARBON FORK | |
| Crankset | SHIMANO SORA FC-R3000 50/34T | |
| BB | SHIMANO BSA THREADED FOR 2-PIECE CRANKSET, 68MM | |
| F Derailleur | SHIMANO SORA FD-R3000 | |
| R Derailleur | SHIMANO SORA RD-R3000-SS DIRECT ATTACH | |
| Shifter | SHIMANO SORA ST-R3000, 2x9-SPEED DUAL CONTROL LEVER | |
| Cassette | SUNRACE CSM96.9AS 11-28T | |
| Brake Lever | INTEGRATED WITH SHIFTER | |
| Brakes | TEKTRO R315 | |
| Tires | PERFORMANCE TIRE 700x25C | |
| Wheelset | C04 ALLOY | |
| Handlebar | ENTITY SPORT ALLOY | |
| Stem | ENTITY OE ALLOY | |
| Headset | ZERO STACK (ZS) SEALED BEARING FOR TAPER HEAD TUBE | |
| Saddle | ENTITY | |
| Seatpost | ENTITY SPORT ALLOY | |
*Product specifications, colors, and other details are subject to change without notice.
Note
There are slight differences in specifications compared to the manufacturer's official website. (The red text in the spec table above indicates the differences.) Please be aware of these.
This Performance for Under 100,000 Yen! The STRATTOS S3 is Perfect for Your First Bike!
- High-quality aluminum frame for an entry-level grade!
- Features an aluminum-steerer carbon fork that balances lightness and durability!
- Equipped with reliable Shimano SORA (2x9 speed) road bike components!
- Already great value for money, but now even more affordable in the limited stock sale!

This model is recommended for anyone considering starting road cycling!
It's a road bike that perfectly balances stability, ease of handling, lightness, toughness, and vibration absorption.
While already a cost-effective model featuring Shimano SORA, we are now offering a special limited-stock sale!
With the money you save, you could upgrade the wheels or brakes and challenge yourself to a 100km ride – that would be great!
Please consider it!










