Beta REV-4T - Specifications & Review

Article Complete Info

Articleid	355276
Category	Trial
Make	Beta
Model	REV-4T
Year	2008

Chassis, Suspension, Brakes & Wheels

Frametype	Double wave aluminium beam
Frontbrakes	Single disc. 4 piston caliper
Frontbrakesdiameter	185 mm (7.3 inches)
Frontsuspension	Hydraulic fork with ø38 mm shaft
Fronttyre	2.75-21
Rearbrakesdiameter	150 mm (5.9 inches)
Rearsuspension	Monoshock
Reartyre	4-18

Engine & Transmission

Borexstroke	77.0 x 53.6 mm (3.0 x 2.1 inches)
Clutch	Wet multi-disc clutch
Compression	11.5:1
Coolingsystem	Liquid
Displacement	249.60 ccm (15.23 cubic inches)
Enginedetails	Single cylinder, four-stroke
Fuelsystem	Carburettor. Mikuni
Gearbox	5-speed
Ignition	electronic

Other Specifications

Modificationscomparedtopreviousmodel	Technical Modifications 2008: New fork settings. Optimisation of the oil-flow has made the forks more sensitive in absorbing the bumps as well as more reactive on the rebound, to facilitate acrobatic manoeuvres or simple movements of the front wheel. New dedicated shockabsorber settings to suit the cycle parts and the power delivery of the 4-stroke engine. New electric fuel tap: more practical, results in better mechanical accessibility and increased reliability. New hot start knob integrated into the carburettor union: immediate and easy accessibility improves practicality in starting the engine from hot. It is also less cumbersome and less vulnerable to crash damage than the earlier lever on the handlebar. New pressure-cast casings: these provide optimised design at the bottom end of the bike, to make a better match with the stoneguard rubber and casing. New outer clutch cover with five-bolt fixing for a better seal. New position for the oil filler plug: improved access to facilitate maintenance operations. New design for the clutch cover with the addition of lateral grooves to facilitate removal of the clutch: greater practicality during maintenance. New exhaust pipe with reduced metal thickness (1 mm): greater performance under acceleration together with a substantial weight reduction (-150 grams). Euro3 homologation. New colour-scheme: a brand-new mix of black and fluorescent red.

Modificationscomparedtopreviousmodel

Technical Modifications 2008: New fork settings. Optimisation of the oil-flow has made the forks more sensitive in absorbing the bumps as well as more reactive on the rebound, to facilitate acrobatic manoeuvres or simple movements of the front wheel. New dedicated shockabsorber settings to suit the cycle parts and the power delivery of the 4-stroke engine. New electric fuel tap: more practical, results in better mechanical accessibility and increased reliability. New hot start knob integrated into the carburettor union: immediate and easy accessibility improves practicality in starting the engine from hot. It is also less cumbersome and less vulnerable to crash damage than the earlier lever on the handlebar. New pressure-cast casings: these provide optimised design at the bottom end of the bike, to make a better match with the stoneguard rubber and casing. New outer clutch cover with five-bolt fixing for a better seal. New position for the oil filler plug: improved access to facilitate maintenance operations. New design for the clutch cover with the addition of lateral grooves to facilitate removal of the clutch: greater practicality during maintenance. New exhaust pipe with reduced metal thickness (1 mm): greater performance under acceleration together with a substantial weight reduction (-150 grams). Euro3 homologation. New colour-scheme: a brand-new mix of black and fluorescent red.

Physical Measures & Capacities

Dryweight	75.0 kg (165.3 pounds)
Fuelcapacity	2.20 litres (0.58 gallons)
Groundclearance	320 mm (12.6 inches)
Overallheight	1,160 mm (45.7 inches)
Overalllength	2,015 mm (79.3 inches)
Overallwidth	825 mm (32.5 inches)
Seatheight	680 mm (26.8 inches) If adjustable, lowest setting.

About Beta

Country of Origin: Italy

Founder: Giuseppe Bianchi & Arrigo Tosi (Betamotor S.p.A.)

Best Known For: Trials and enduro dominance; RR/RS enduros and Evo trials line

Company History

Betamotor began in 1905 building bicycles in Florence and evolved into one of the world’s premier off-road motorcycle makers. The company’s DNA is balance and traction—first in observed trials, where featherweight control and throttle finesse matter, and later in enduro, where day-long reliability meets special-stage speed. Beta’s modern RR/RS enduros are renowned for chassis that communicate clearly, engines with tractable midrange, and suspension valving that works out of the crate for real riders, not just pros. The Evo trials line continues to win at the highest levels, feeding lessons about weight distribution and clutch feel back into the enduro range. Unlike some rivals, Beta embraces rider-scale adjustability—map switches, power valve tweaks, and ergonomic options that let owners tailor bikes without a race truck. Historically, Beta personifies Italian craftsmanship aimed at dirt: elegant castings, tidy looms, and field-friendly service. Club racers and trail riders praise how Betas turn fatigue into flow; the bikes reward precise inputs yet forgive mistakes. In a category where specs are loud, Beta’s quiet confidence—how the bike feels between trees—has built a fiercely loyal following.

Other Years

2008