2021 Trs One RR 125 Technical Analysis & Specification Breakdown
Built around Trs's trial motorcycle platform, the 2021 Trs One RR 125 pairs a 124 cc (7.6 cu in) liquid-cooled single cylinder, two-stroke architecture with road-focused gearing. Internal engine geometry specifies a bore and stroke of 56.0 x 54.6 mm (2.2 x 2.1 inches).
On the scales, the One RR 125 measures 65 kg (143 lbs) dry. Rider ergonomics and chassis geometry center around a 640 mm (25.2 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops. The 2.3-liter (0.6 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Trs archive, this model family spans 4 indexed model years from 2021 to 2025, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
640 mm (25.2 in)
Engine
Displacement124.0 ccm (7.57 cubic inches)
Engine TypeSingle cylinder, two-stroke
Bore x Stroke56.0 x 54.6 mm (2.2 x 2.1 inches)
Fuel SystemCarburettor. Keihin PWD 28
IgnitionHIDRIA double spark ignition CDI
Lubrication1.5% oil mixture
CoolingLiquid
Transmission
Gearbox5-speed
Final DriveChain (final drive)
Clutch3-disc system
Chassis
Frame TypeTwin-spar aluminum
Front SuspensionTECH with aluminium bar Ø 39
Front Travel175 mm (6.9 inches)
Rear SuspensionAdjustable monoshock
Rear Travel168 mm (6.6 inches)
Wheels & Brakes
Front Tyre2.75-21
Rear Tyre4.00-18
Front BrakesSingle disc
Front Brake Ø185 mm (7.3 inches)
Rear BrakesSingle disc
Rear Brake Ø150 mm (5.9 inches)
WheelsMorad aluminium
Dimensions & Weight
Dry Weight65.0 kg (143.3 pounds)
Seat Height640 mm (25.2 inches) If adjustable, lowest setting.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
