2021 · Retro Classic · Buyer's Guide
The Purist Bonneville Done Right
The T100 is the version of the Bonneville idea with nothing extra bolted on. Its 900 cc liquid-cooled parallel twin makes 64 hp at 7,400 rpm and 59 lb-ft at 3,750 rpm, which tells you where it lives: low, early, and unhurried. The cooling is there, but Triumph has kept it out of your eye line. What you see instead is the tank, the coach lines, the peashooter pipes, the wire wheels. ABS and traction control are standard and stay invisible until you need them. In a class where retro often means compromise, this one scores a flat 10 on design and doesn't apologize for it.
It rides the way it looks. Wide flat bars, low pegs, a 31.1 in seat, and a 57.1 in wheelbase give you a relaxed, roomy cockpit and a bike that holds a line at speed without fuss. Ownership is cheap by big-twin standards, reliability is solid, and the aftermarket is deep enough that no two T100s need look alike. This is a bike for the rider who wants classic shape and modern hardware in one package. The honest caveat: five gears, a 503 lb wet weight, and a non-adjustable fork mean it rewards a rhythm rather than an attack.
Spec sheets don't ride bikes, but they set the baseline.
| Power | 64 hp (48 kW) @ 7,400 rpm |
|---|---|
| Torque | 59 lb-ft (80 Nm) @ 3,750 rpm |
| Displacement | 900 cc |
| Engine | Parallel twin |
| Cooling | Liquid-cooled |
| Gearbox | 5-speed |
| Final drive | Chain |
| Fork | Telescopic |
| Front brake | 310 mm |
| Front tire | 100/90-18 |
| Rear tire | 150/70-17 |
| Wheelbase | 57.1 in (1450 mm) |
| Seat height | 31.1 in (790 mm) |
| Wet weight | 503 lb (228 kg) |
| Fuel capacity | 3.8 gal (14.5 L) |
Equipment check
Chassis
Comfort
Connectivity
Drivetrain
Safety
The 270-degree twin gives you an offbeat pulse that you feel through the pegs before you hear it, and the exhaust note stays low and round rather than loud. Vibration is present, not intrusive. It sits in the palms as texture. You sit in this bike, not on it: the bars fall wide and flat under your hands, the pegs sit low enough that your knees stay open on a long day, and the 31.1 in seat means most riders plant both boots without thinking. The 503 lb wet weight makes itself known at walking pace, then vanishes once you're rolling. On a real road at a real pace, the 18 in front wheel gives the steering a slow, deliberate quality. You stop hurrying. That's the point of the thing.
This part of the guide isn't my own testing. It's what riders have told me over the years, in messages, in conversations at fuel stops and rallies, and in the owner chatter that keeps circling the same points. On the T100, that chatter is unusually consistent. The praise lands in two places, and the complaints land in three.
Owners bring up the styling before anything else: the teardrop tank, the wire wheels, the chrome, and paint that holds up when you get close to it. Right behind it comes the 900 cc twin. Riders describe strong pull from low in the rev range and an offbeat throb that doesn't wear thin. Quieter patterns run underneath. The bike is easy to manage in traffic and easy to park, the chassis steers neutrally for riders of very different experience levels, and a smaller group singles out the 2021 revisions for the added power, the trimmed weight, and the better hardware.
Suspension leads. With no damping adjustment, riders report a firm, sometimes harsh ride on rough surfaces and a chassis that runs out of composure when pushed. The brakes draw the next round: a hard pull at the lever, less initial bite than owners want. Riders who cover freeway miles mention the five speeds, the higher revs, and the noise that comes with them.
Alternator wiring may short circuit and overheat (Recall)
NHTSA recall 24V785000 (November 2024) affected 2022–2024 Bonneville T100 models because the wiring between the alternator and main harness connector can short circuit and overheat, presenting a fire risk. Dealers will install a new wire alignment clip, free of charge.
Where this Triumph Bonneville T100 pulls ahead of — or falls behind — its rivals on the numbers, and the typical bike in its class on character.
Power
Torque
Displacement
Wet weight
Seat height
Forget spec-sheet bragging. Here's who the Bonneville T100 is actually built for.
If your ideal weekend is the Kancamagus at a civil pace with a diner stop halfway, this is your bike. The torque is where you ride, the looks earn nods in every small town, and nothing about it hurries you.
Made for Acadia National Park · Austin / Handbuilt Motorcycle Show · Blue Ridge Parkway
It has the presence and the pulse, and it'll draw a crowd at Daytona. Understand the trade first: this is a lean British twin, not a big-bore cruiser, and the sound is subtler than what you may be after.
Made for A1A — Florida Atlantic Coast · Black Hills / Sturgis Rally Hub · Daytona Main Street / Bike Week
The Twisted Sisters are fun on a T100, but on its terms. Five gears, an 18 in front wheel, and 503 lb mean you flow through the corners rather than attack them. Ride it that way and it's a great day out.
Made for Austin / Texas Hill Country · Twisted Sisters · Austin / Handbuilt Motorcycle Show