Honda Grom Specs, Top Speed & Review
TL;DR
- The 2025 Honda Grom runs a 123.9cc air-cooled single making 9.7 hp and 7.7 lb-ft of torque with a 5-speed manual gearbox
- Top speed on a stock Grom is 55–60 mph under normal conditions; a tucked rider on a flat road can sometimes touch 65 mph.
- Curb weight is 224 lbs with a 30-inch seat height — most adults can flat-foot it at a stop.
- The 2025 base Grom starts at $3,599 MSRP plus $300 destination; the ABS version is $3,799
- It’s the right bike for new riders, short commuters, and anyone who wants a cheap, endlessly customizable city machine.
What Is the Honda Grom and Who Should Buy One?
The Honda Grom is a 125cc minimoto — a small-displacement, full manual-clutch street motorcycle built for city riding, beginner training, and general fun. Honda launched the original in 2014 and overhauled it significantly in 2022, adding a 5-speed gearbox and a new frame. The 2025 model gets restyled bodywork but carries over the same mechanical package.
It’s the right machine for riders who want real motorcycle controls — clutch, shifter, disc brakes — without the physical intimidation of a full-sized bike. A 224-lb curb weight and 30-inch seat height let even shorter riders get both feet solidly on the ground at a stop. Experienced riders buy it as a commuter or project bike; new riders buy it to learn on.
2025 Honda Grom Full Specs
All figures from Honda Powersports official press release (Honda, 2025):
| Spec | Grom | Grom SP | Grom ABS |
|---|---|---|---|
| Engine | 123.9cc air-cooled SOHC single | Same | Same |
| Bore x Stroke | 50.0mm x 63.1mm | Same | Same |
| Compression | 10.0:1 | Same | Same |
| Fuel System | PGM-FI, 24mm throttle body | Same | Same |
| Transmission | 5-speed manual | Same | Same |
| Final Drive | #420 chain, 15T/38T | Same | Same |
| Front Suspension | 31mm inverted fork, 4.3 in. travel | Same | Same |
| Rear Suspension | Single shock, 4.1 in. travel | Same | Same |
| Front Brake | 220mm disc, 2-piston caliper | Same | 220mm disc, ABS |
| Rear Brake | 190mm disc | Same | Same |
| Front Tire | 120/70-12 | Same | Same |
| Rear Tire | 130/70-12 | Same | Same |
| Seat Height | 30.0 in. | 30.0 in. | 30.0 in. |
| Curb Weight | 224 lbs | 224 lbs | 227 lbs |
| Fuel Capacity | 1.6 gal | 1.6 gal | 1.6 gal |
| Wheelbase | 47.2 in. | Same | Same |
| MSRP (US) | $3,599 | $3,699 | $3,799 |
Honda Grom Top Speed: What to Actually Expect
The stock 2025 Honda Grom tops out at 55–60 mph under normal conditions. With a full tuck, a tailwind, and a long flat road, some riders report touching 65 mph — that’s the ceiling, not a daily number (Fay Myers, 2025).
The 15T/38T final drive gearing Honda chose prioritizes low-end pull over top speed. That ratio gets the Grom off lights quickly and keeps it responsive in the 25–50 mph range where city riding actually happens. Push it past 55 mph and the motor is spinning near its limit — vibration climbs and nothing about it is comfortable.
This is not a highway bike. It’ll survive a short frontage road stretch at 55 mph, but sustained freeway speeds are off the table.
Acceleration and Real-World Performance
The Grom’s 9.7 hp peaks at 7,250 rpm, and 7.7 lb-ft of torque arrives at 5,500 rpm (Torquepedia, 2025). At 224 lbs the power-to-weight ratio is decent for urban use. Off the line, a stock Grom hits 0–30 mph in roughly 3–4 seconds with a clean launch. Getting to 50 mph takes around 10–12 seconds depending on rider weight and road conditions.
The #420 chain on 15/38 sprockets gives the initial acceleration a punchy, go-kart character that makes the bike feel faster than the numbers suggest. Above 45 mph, the power drops off and progress slows noticeably. There’s no passing reserve at 55 mph — what you have is what you have. For anything under 50 mph, though, the Grom keeps up with urban traffic without drama.
The 5-speed gearbox deserves credit here. Shifts are short and positive, and five gears let the engine stay in its powerband across a wider speed range than the old 4-speed allowed. First is tall enough that you won’t lug it pulling away, and fifth drops revs enough for a relaxed 40 mph cruise.
Engine, Chassis, and Suspension
The 123.9cc SOHC single runs a 10.0:1 compression ratio with Honda’s PGM-FI fuel injection through a 24mm throttle body. Cold starts are instant, throttle response is clean at any temperature, and there’s no carburetor to jet or tune. The steel backbone frame runs a 25-degree rake with 3.31 inches of trail, which gives the Grom its darty, quick-turn character. You think about changing direction and it goes.
The 31mm inverted fork up front offers 4.3 inches of travel — more than the previous generation. The rear single shock gives 4.1 inches. Neither end is adjustable on the base or SP models, which is the honest limitation: riders over 175 lbs will feel the rear compress noticeably over rough pavement, and the front dives under hard braking. The suspension is calibrated for a lighter rider on smooth city streets. It works well in that context.
Brakes are single-disc front and rear — 220mm up front with a 2-piston caliper, 190mm at the rear. Stopping power is adequate for a 224-lb bike. The ABS trim adds Honda’s anti-lock system on the front wheel for $200 more. Worth it for new riders or anyone in a wet-weather climate.
What It Gets Right and Where It Falls Short
The ergonomics work across a wide range of rider heights. The low seat, neutral bars, and sensibly positioned pegs let riders from 5’0″ to about 6’0″ ride comfortably. Above 6’2″, the knees ride uncomfortably high.
Fuel economy is one of the Grom’s best real-world numbers. Honda’s EU test cycle rates it at 65.7 km/L, and US riders consistently report 100–166 mpg depending on speed (Cycle World, 2024). The 1.6-gallon tank delivers around 150–160 miles of range before hitting reserve.
The honest drawbacks: highway use is genuinely off-limits, the suspension is too soft for heavier riders, and the seating position gets uncomfortable past 40 minutes for taller people. Used Grom prices stay stubbornly close to new — a clean 2023 or 2024 example regularly lists for $2,800–$3,200 — so there’s no great bargain waiting on the secondary market.
Frequently Asked Questions About the Honda Grom
What is the Honda Grom’s top speed?
A stock 2025 Honda Grom reaches 55–60 mph under normal conditions. Tucked riders on flat roads have touched 65 mph, but that’s the ceiling. The gearing and power output are tuned for city riding, not outright speed.
Can you ride a Honda Grom on the highway?
No, not practically. The Grom tops out below the minimum legal speed on most US interstates. Short frontage road sections are possible but uncomfortable. It’s a city, backroad, and campus bike.
When did the Honda Grom get a 5-speed transmission?
The 5-speed arrived with the 2022 generation redesign. All Groms from 2014 through 2021 used a 4-speed. The 2022 update also brought a new frame, revised suspension, and updated bodywork. The 2025 carries the same mechanicals with restyled panels.
Is the Honda Grom a good beginner motorcycle?
Yes, with specific caveats. The 30-inch seat height, 224-lb weight, and manageable power make it genuinely approachable. The full manual clutch and 5-speed teach real motorcycle skills. The limitation is top speed — a beginner who needs to ride roads faster than 50 mph will hit the Grom’s ceiling quickly.
How much does a 2025 Honda Grom cost?
The 2025 base Grom is $3,599 MSRP plus $300 destination. The Grom SP is $3,699 and the Grom ABS is $3,799, all before dealer fees and taxes (Honda Powersports, 2025).
Key Takeaways
- The 2025 Grom makes 9.7 hp and 7.7 lb-ft from a 123.9cc fuel-injected SOHC single with a 5-speed gearbox and 224-lb curb weight.
- Real-world top speed is 55–60 mph; the bike is not suitable for freeway use.
- Seat height is 30.0 inches with flat-foot access for most adults across three trim levels: base, SP, and ABS.
- Starting MSRP is $3,599 plus $300 destination, with ABS at $3,799.
- Suspension is too soft for heavier riders, and the seating position gets uncomfortable on longer rides for taller people.
- The aftermarket is well-developed — chain, sprocket, exhaust, and full body panel swaps are all straightforward bolt-ons.
