120/70R17 Dunlop Roadsmart 4 58W

Description

120/70R17 Dunlop roadsmart 4 58W
On-road

The dunlop roadsmart iv (120/70 zr17 58W) is a premium sport-touring radial front tire engineered for long-distance mileage, quick warm-ups, and consistent handling stability across wet and dry pavement.Technical breakdowncomponentcode / valuemeaningwidth120120 mm section widthaspect ratio70Sidewall height is 70% of width (84 mm)constructionzrhigh-speed radial constructionrim diameter17Fits a standard 17-inch front motorcycle wheelload / speed rating(58W)max load 236 kg (520 lbs) / max speed >270 km/h (168+ mph)homologationdot / ece100% street legaltypetl (tubeless)fits standard alloy tubeless wheelspositionfront wheelfront-specific tread and carcass tuning

Key technologies & construction
Mt multi-tread technology: features a high-wear central compound for extended mileage paired with soft lateral shoulder compounds for high cornering grip.

Hi-silica compound: high silica content ensures quick warm-up in cold conditions and strong braking traction on wet asphalt.

Ipt (intuitive response profile): a revised front profile contour that reduces steering effort, providing quick, neutral turn-in and high line-holding stability.

Dynamic tread groove design: long, sweeping tread grooves quickly channel standing water away from the contact patch to prevent hydroplaning in rain.

Air pressure guidelinesriding conditionrecommended pressure (cold)solo sport / commuting34 – 36 PSI (2.3 – 2.5 bar)two-up / fully loaded touring36 – 38 PSI (2.5 – 2.6 bar)common fitments (120/70 zr17 front)
Standard front fitment for sport-touring, adventure-street, naked, and sportbikes:

Kawasaki: ninja 1000SX, z900, versys 1000

Yamaha: mt-09, tracer 9 GT, fjr1300

Bmw: r 1250 rs, s 1000 xr, f 900 r

Honda: cb1000R, vfr800, nt1100
Standard vs. GT spec casing: dunlop manufactures the roadsmart iv 120/70 zr17 in two distinct casing options. The standard version is tuned for lightweight to middleweight sport and naked bikes (under 500 lbs / 225 kg) for compliant damping. The GT spec features a stiffer 2-ply carcass structure tailored specifically for heavy tourers (fjr1300, concours 14, bmw r1250RT) to resist carcass flex and cupping under heavy luggage.

Jlb (jointless belt) construction: utilizes a continuously wound single strand of aramid belt cord around the radial carcass. This eliminates cord overlap joints, reducing internal friction, heat generation, and dynamic tire growth at speeds over 120 mph (190 km/h).

Linear handling performance: dunlop specifically engineered the front crown profile to maintain a consistent steering radius throughout its lifecycle, meaning steering turn-in force remains neutral even after thousands of miles of center wear.

Performance metrics vs. Predecessor (roadsmart iii)feature / metricdunlop roadsmart iiidunlop roadsmart ivfront tread life~10,000–12,000 milesup to 23% longer service life (~12,000–15,000+ miles)wet grip improvementbaseline standard+10% shorter stopping distancesteering effortneutral~15% lighter turn-in initiation forcesilica dispersalstandard hi-silicafine-carbon + ultra-dispersed micro-silica matrix
Typical matching rear setup (120/70 zr17 front)

Depending on the motorcycle platform, this front radial tire is typically paired with the following 17-inch rear sizes:

180/55 Zr17: standard fitment for most middleweight/heavyweight sportbikes and sport-tourers (ninja 1000, mt-09, z900).

190/55 Zr17: wide fitment for high-horsepower naked and touring models (ktm 1290 super duke GT, bmw s1000XR).

160/60 Zr17: fitment for mid-size capacity machines (kawasaki versys 650, suzuki sv650).