Triumph Bonneville T4

Overview

Performance And Engine

The Bonneville T4 has a liquid-cooled, single-cylinder, four-stroke engine with four valves and double overhead camshafts. It has a 350cc capacity, with an 89 mm bore and a 56.1 mm stroke. Fuel is supplied by Bosch electronic fuel injection and electronic throttle control.

Some sources list the engine as 349cc, but it is usually called 350cc. The T4 gets a new cylinder head and a special Bonneville tune. It reaches maximum torque at 5,500 rpm and peak power at 7,000 rpm. The engine delivers strong torque, quick throttle response, and more torque at lower revs.

These details explain the engine’s intended feel. The Bosch fuel-injection system uses electronic throttle control, which is different from a traditional mechanical throttle.

The T4 has a stainless-steel twin-skin header and a stainless-steel silencer. The engine uses a peashooter-style silencer, designed to give clear firing pulses and a unique exhaust sound.

There are no official 0–60 km/h or 0–100 km/h acceleration times for the Bonneville T4.

The Bonneville T4 comes with a six-speed manual gearbox and an X-ring chain final drive. The rider uses the clutch and shifts gears in the usual way. It is not an automatic or clutchless system.

Individual gear ratios or road speed per 1,000 rpm are not available.

The T4 uses a wet, multi-plate slip-and-assist clutch, which means it has both assist and slipper features.

A claimed top speed for the Bonneville T4 is 132 km/h.

Mileage And Fuel Efficiency

There is no official fuel economy figure for the Bonneville T4 yet, and no ARAI-certified mileage is available. An estimated mileage of 27.02 km/l is listed, but this is only an estimate and not an official or tested result.

The precise number does not show how it was measured. The 27.02 km/l figure is still just an estimate, not a confirmed result.

An estimated mileage of 32–32.5 km/l is reported for the Bonneville T40 range, which includes the T4. The Speed T4 is said to get about 30 km/l. Even though both have the “T4” name and similar engines, the Speed T4 is a different model from the Bonneville T4.

Features And Technology

The Triumph Bonneville T4 mixes classic looks with modern features like a round colour LCD display, full LED lighting, ABS, and traction control. It also has navigation, phone, and music controls for added connectivity. A slip-and-assist clutch and adjustable twin rear shocks come standard. You can also choose optional seats, protection bars, and panniers to personalise your bike.

1. Circular Colour LCD Display: The Bonneville T4 has a 4-inch round colour LCD screen. Its shape keeps the classic look of the instrument panel but adds a digital interface. The display is LCD only, not a touchscreen.
2. Turn-by-Turn Navigation: The technical specification confirms turn-by-turn navigation on the instrument display.
3. Standard Phone and Music Controls: Phone and music controls are included as standard. These functions are operated through the left-hand switch cube and the display’s user interface.
4. Backlit Handlebar Controls: The left-hand switch cube is backlit, making it easier to find and use the controls in low light. It gives access to the bike’s connected features and instrument interface.
5. Riding Modes: Selectable riding modes are available.
6. Electronic Throttle Control: The Bosch electronic fuel-injection system incorporates electronic throttle control.
7. Traction Control: Traction control is included as part of the standard rider-technology package.
8. Anti-Lock Braking System: ABS is included with the front and rear brakes.
9. Full LED Lighting: The Bonneville T4 comes with full LED lighting, including its signature round headlight and Daytime Running Light. This means the whole lighting system is LED, not just the headlamp.
10. Automatic Headlight Activation: The headlight turns on by itself in low light, showing it responds to lighting conditions. There is no information about automatic high-beam or adaptive cornering lights.
11. Self-Cancelling Indicators: The indicators turn off automatically, but there are no details about how or when this happens.
12. Emergency Deceleration Warning: The bike includes an emergency deceleration warning, but it’s not clear which lights flash or when it activates.
13. Slip-and-Assist Clutch: The T4 has a wet, multi-plate slip-and-assist clutch, giving both assist and slipper features in a regular manual clutch. It is not automatic, and there is no quickshifter.
14. Front Disc Brake: The front brake has a single 310 mm fixed disc, a twin-piston axial caliper, and ABS.
15. Rear Disc Brake: The rear brake uses a single 255 mm fixed disc, a single-piston floating caliper, and ABS.
16. Forty-Three-Millimetre Front Forks: The front suspension has 43 mm forks and 130 mm of wheel travel.
17. Preload-Adjustable Twin Rear Shocks: The rear suspension has twin shock absorbers with spring-preload adjustment and 130 mm of wheel travel.
18. Spoked Wheels with Aluminium Rims: The T4 comes with an 18-inch front wheel and a 17-inch rear wheel, both with spokes and aluminium rims.
19. Published Tyre Sizes: The front tyre is 100/90-18 and the rear is 150/70 R17. These sizes are standard for the T4.
20. Standard and Accessory Seat Options: The standard seat height is 790 mm. An accessory low seat reduces this to 770 mm and comfort seats are also available within the accessory range.
21. Fourteen-and-a-Half-Litre Fuel Tank: The T4 has a 14.5-litre fuel tank. Its teardrop shape forms part of the classic Bonneville design.
22. Stainless-Steel Exhaust Construction: The exhaust has a stainless-steel twin-skin header and a stainless-steel peashooter-style silencer, keeping the Bonneville’s traditional look.
23. Tubular Steel Frame and Steel Swingarm: The chassis uses a hybrid spine and perimeter tubular steel frame with a twin-sided steel swingarm.
24. Classic Engine Detailing: Machined cooling fins and large finned header roses give the engine a traditional appearance. The engine is liquid-cooled.
25. Optional Protection and Luggage Accessories: Protection bars and classic panniers are available within the accessory range, alongside alternative seats. These allow additional protection, carrying capacity and seating configurations.

Build Quality

The Bonneville T4 has a hybrid spine and perimeter tubular-steel frame with a twin-sided steel swingarm. Its spoked wheels use aluminium rims, and the exhaust has a stainless-steel twin-skin header and silencer. These materials are confirmed in Triumph’s Indian technical specification.

The T4 combines classic Bonneville design with clearly listed metal parts. It is said to have rich paint, hand-finished details, and carefully chosen materials. The finishes are made to last.

The T4’s details include machined cooling fins, finned exhaust-header roses, and a peashooter-style silencer. Its aluminium-rimmed wire-spoke wheels, long mudguards, and classic body shape define its look.

It is not known how well the T4 will resist monsoon weather, coastal corrosion, paint fading, or rattles from rough roads over time. Claims about durability come from the manufacturer.

Handling

Triumph lists the T4’s wheelbase as 1,418 mm, rake angle as 25.4 degrees, and wet weight as 195 kg. The handlebar is 818 mm wide. These numbers show the bike’s size and shape. The T4 is said to handle well, making it good for both city streets and open roads.

The T4 has an 18-inch front wheel and a 17-inch rear wheel. The specified tyres are 100/90-18 at the front and 150/70 R17 at the rear. Both wheels use tubed construction with aluminium rims. This wheel setup stands out compared to the Royal Enfield Classic 350. The wheel sizes are confirmed specs.

The front suspension has 43 mm forks with 130 mm of wheel travel. The rear uses twin shock absorbers with the same travel and spring-preload adjustment. The T4’s rear suspension travel is longer than the Classic 350’s 90 mm. However, travel alone does not show how the T4 handles potholes, bumps, or rough roads.

The front brake uses a 310 mm disc with a twin-piston axial caliper. The rear has a 255 mm disc with a single-piston floating caliper, and ABS is specified at both ends. There are no measured stopping distances or detailed assessments of brake-lever feedback.

Comfort

The T4 has a relaxed riding position and a seat that works well for both the rider and passenger. Its bench-style seat matches the classic Bonneville design. The handlebar is 818 mm wide, giving a sense of the bike’s size.

The standard seat height is 790 mm, but you can get an optional low seat that brings it down to 770 mm. The T4’s standard seat is lower than the Classic 350’s 805 mm seat. The low seat is an extra, not included as standard. Still, these heights don’t mean every rider will be able to put both feet flat on the ground.

The T4’s suspension gives 130 mm of wheel travel at the front and back, and you can adjust the rear spring preload. This shows what’s available, but more rear travel doesn’t always mean better comfort. The seat and relaxed riding position are meant to make things comfortable for both rider and passenger. The bench seat is a key feature.

Overall, the T4 is clearly made for both rider and passenger. Triumph offers low and comfort seats as accessories, with the low seat at 770 mm. When talking about the India-spec T4, these accessories should be kept separate from the standard seat.

Styling

The Bonneville T4 has a classic roadster look. Its teardrop tank, smooth lines, twin rear shocks, and peashooter silencer all match the main features of the Bonneville family. Triumph says this design is inspired by its 1960s motorcycles.

The T4 has the same design, size, and shape as the Bonneville T40. It comes in its own set of colours, so it stands out in the lineup even though the basic shape stays the same.

The teardrop-shaped tank is the main part of the T4’s design. The tank accents change with the paint colour, but the Triumph logo is always easy to see. Long mudguards and a bench seat finish off the classic roadster look.

Each T4 paint option uses just one main body colour, unlike the T40’s two-tone choices. Even with different logos and accents, these are still single-colour options.

A round LED headlight keeps the Bonneville’s familiar front look. Triumph adds its signature daytime running light to this round headlamp, so it keeps the classic shape but uses modern lighting.

The instrument display is also in a round housing. This matches the other round shapes at the front of the bike, instead of using a rectangular cluster. Triumph says the round design helps keep the Bonneville’s classic look.

The engine has visible details like machined cooling fins and large finned exhaust-header roses. Triumph says these parts are meant to give the engine a classic look, connecting it to older Bonneville models instead of making it look plain and modern.

The engine is designed to look clean and simple. It stands out under the fuel tank as a main feature of the bike.

Wire-spoked wheels with aluminium rims add to the T4’s classic look. Along with the visible twin rear shocks, they help keep the style of old British roadsters. Triumph points out that both are key parts of the Bonneville design.

The peashooter-style silencer is another key design feature. Its long shape matches the tank, seat, and mudguards, and Triumph lists it as part of what makes the T4 a Bonneville. The specs confirm it uses a stainless-steel silencer and a stainless twin-skin header system.

Color Options And Variants

The India-spec Bonneville T4 comes in Phantom Black, Carnival Red, and Competition Green. Each colour has its own tank accents and branding details.

The Bonneville T4 is part of the larger Bonneville T40 lineup. For the T4, Phantom Black, Carnival Red, and Competition Green are just colour choices, not different equipment versions.

The T4’s three colours should therefore not be described as three different mechanical or equipment variants. They are distinguished by paint treatment and decorative details.

The full range includes the Bonneville T4, Bonneville T40, and Bonneville T40 Black. That’s why some sources list more colour options than the three for the T4 alone.

All three T4 colours keep the same main design features: the teardrop tank, round headlight, spoked wheels, twin rear shocks, and peashooter silencer. Choosing Phantom Black, Carnival Red, or Competition Green only changes the paint, accents, and branding, not the body design.

Value For Money And Pricing

The Triumph Bonneville T4 starts at ₹ 2,85,039 ex-showroom. At this price, the T4 sits above lower-priced retro motorcycles such as the Royal Enfield Classic 350 and Meteor 350, while also competing for buyers considering the less expensive Speed T4 and Speed 400.

The on-road price covers registration and insurance on top of the ex-showroom price. In Ahmedabad, the T4’s on-road price is ₹2,85,039. This is just an estimate for that city, not for all of India.

There’s a ₹30,040 gap between the ex-showroom and on-road prices. So, if you only budget for the ₹2,54,999 starting price, you won’t cover the Ahmedabad registration and insurance costs. Optional accessories aren’t included in this total.

Triumph offers accessories like low seats, comfort seats, protection bars, and panniers. The official page doesn’t list their prices, so they shouldn’t be counted as part of the standard bike’s value or assumed to be free.

The T4’s value comes from its Bonneville style and its standard features, like a round colour LCD display, turn-by-turn navigation, phone and music controls, ABS, and traction control. It also has full LED lighting and a slip-and-assist clutch. These features help show what you get for the price, not just the brand name.

This doesn’t mean the T4 has the best features for the price in India. It does offer a connected instrument display and electronic rider aids in a classic Bonneville package, but whether that’s worth the extra cost depends on what other bikes you’re looking at.

At the ₹2,54,999 starting price, the T4 is ₹66,065 more than the Classic 350 and ₹53,948 more than the Meteor 350. It’s also ₹44,721 more than the Speed T4 and ₹19,515 more than the Speed 400. These numbers compare starting prices, not fully equipped versions.

The higher price is a big deal for buyers who mainly want the cheapest retro bike. The T4’s value is more about its Bonneville style and features. A lower price doesn’t mean a rival is the same kind of bike, but it does mean it’s cheaper to buy.

The T4 comes with a two-year, unlimited-distance warranty and needs servicing every 12 months or 16,000 km, whichever comes first. These are important things to consider when looking at the full package.

The time limit is important: even if you ride less than 16,000 km a year, you’ll still need a service after 12 months. The schedule doesn’t say how much servicing, parts, or consumables cost. Without those numbers, you can’t say the T4 is cheaper to maintain than its Indian rivals.

The official page doesn’t give a full list of maintenance costs, resale value, or total ownership costs. So, you can’t claim the T4 is the cheapest to own or has the best resale value in its class. It’s easier to judge its value based on the purchase price than on long-term costs.

The following models provide relevant comparisons across retro motorcycles and Triumph’s own lower-priced roadsters.

1. Royal Enfield Classic 350
2. Royal Enfield Meteor 350
3. Royal Enfield Goan Classic 350
4. Royal Enfield Guerrilla 450
5. Jawa Perak

Other bikes like the Royal Enfield Goan Classic 350, Royal Enfield Guerrilla 450, and Jawa Perak are also alternatives to the wider Bonneville T40 range. These options go beyond just the cheaper models and matter for buyers looking at different types of bikes in this price range.
You should compare these models using up-to-date, local prices for each version. Just being on an alternatives list doesn’t mean they’re direct replacements for the T4 or that there’s one set price difference across India.