Tambora A4

The Polygon Tambora A4 is a purpose-built gravel bicycle that bridges the gap between road speed and off-road capability. Engineered around an aluminium frame and equipped with Shimano GRX groupset and hydraulic disc brakes, it is designed as a complete, integrated system — not a collection of parts. At Rs. 1,52,490, it represents a serious commitment to versatile, performance-oriented cycling across India's varied terrain.

Use Cases

Daily training. Reliable use across Indian training conditions — heat, humidity, and rough tarmac.

Race day. Performance-grade construction for competitive efforts.

Long rides. Built for full-day rides across Western Ghats, Sahyadri, or Nilgiri climbs.

Our Take

For riders tackling everything from Pune's Sinhagad switchbacks to the gravel forest roads near Coorg or the dusty climbs above Ooty, the Tambora A4 makes a compelling case. The GRX groupset is gravel-specific — designed for mixed-surface riding where confident shifting under load matters. Aluminium keeps the build honest and durable without compromising stiffness. Disc brakes inspire confidence in wet monsoon descents and on loose surfaces where rim brakes would hesitate.

Sizing for Indian Riders

Polygon uses seat tube length or S/M/L sizing depending on the model year. Indian riders often run slightly shorter torso proportions relative to leg length compared to European sizing norms — when in doubt, consult the Polygon geometry chart and consider sizing down for a more aggressive gravel position. In the heat above 35°C, a slightly upright fit reduces fatigue on longer rides. Professional bike fit is strongly recommended.

Compatibility Notes

The Tambora A4 ships as a complete build with GRX groupset and hydraulic disc brakes. Pedals are not included — pair with SPD two-bolt cleats standard for gravel riding. Verify tyre clearance before upgrading tyres. First-service inspection recommended after 100km; annual service maintains component longevity and warranty validity.

Pairs Well With

Complete your Tambora A4 setup with gravel-specific clipless pedals and cycling shoes, a lightweight helmet suited to mixed-terrain riding, gravel or adventure cycling kit for long days in the saddle, and a quality mini pump plus tubeless repair kit for self-supported rides far from the city.

Explore the full Polygon collection at Cobbled Climbs

Specifications

Explore the full Polygon collection at Cobbled Climbs

Why buy from Cobbled Climbs

• 100% genuine — authorised Polygon retailer in India
• Free delivery on orders above Rs. 2,500
• Cash on delivery available nationwide
• 7-day easy returns
• Shipped from Mumbai
• Expert advice — built for Indian cycling conditions

Polygon Bikes is a leading Indonesian bicycle manufacturer with a global reputation for engineering value-driven, performance-oriented bicycles. With decades of design and manufacturing expertise, Polygon produces everything from entry-level trail bikes to race-ready gravel machines, backed by strong warranty support and a growing presence across the Indian cycling market.

Why pay full price when loyalty pays back?

Club House rewards you for every purchase — up to 5% cashback, 100 bonus points to start, birthday rewards, and early access to limited drops. It’s our way of saying thanks for riding with us.

Shipping:
We ship all orders within 48 hours, excluding Sundays and public holidays. Delivery typically takes 3 to 5 days depending on your location.

Returns:
If your item arrives damaged, incorrect, or doesn’t fit, you may request a return within 7 days of delivery. Email us at support@cobbledclimbs.com with your order details. Items must be unused and returned in original packaging with all tags and labels intact.

Sale Item Guidelines:
Products purchased on sale are final sale and not eligible for return or exchange. Please double-check sizing, fit, and product details before purchasing.

Please note:
We follow a no money refund policy. Eligible returns are offered store credit or exchange only.