Shinko Motorcycle Tires SR777 HD Cruiser Front Tire 120/70-21 Black Wall — Heavy-Duty Bias, Aramid-Reinforced for Stable Handling

Designed specifically for V‑Twin and metric cruisers, the SR777 HD blends a cruiser-focused tread pattern with a reinforced carcass and aramid belting to support heavier loads and improve directional stability. The 120/70-21 size fits many large-front-wheel setups; the V speed rating and 68 load index suit typical street cruising conditions. Its rubber compound and siped grooves aim to balance grip, comfort, and predictable performance in both dry and wet conditions.

How does this tire improve front-end confidence on a cruiser?

The SR777 HD uses a reinforced (heavy-duty) carcass and aramid belt to reduce flex under load, which helps maintain steering precision and a planted feel at city speeds and on winding roads. That construction minimizes wandering and gives a more predictable response when braking or leaning into turns.

• Reinforced carcass for reduced flex and steadier steering
• Aramid belting increases load capacity and directional stability
• Bias-ply design tuned for cruiser geometry and front-end feel

Will this tire handle wet roads and variable conditions?

Yes—the tread pattern includes functional siping and angled grooves that channel water away from the contact patch, improving traction when surfaces are damp. The compound formulation aims to retain grip without sacrificing ride comfort across typical street temperatures.

• Siping and grooves help disperse water for better wet grip
• Tread layout balances contact patch stability and water evacuation
• Compound optimized for street use and cruiser riding conditions

What sizes and fitments are available, and is 120/70-21 suitable for my bike?

The SR777 line comes in many sizes to accommodate a wide range of V‑Twin and metric cruiser models; this specific listing is the 120/70-21 front tire. Confirm your motorcycle’s recommended front tire size, rim diameter (21" for this tire), and the vehicle placard or owner’s manual before purchasing.

• This listing: 120/70-21 front tire, 21" rim size compatibility
• Load rating: 68 — verify against your motorcycle’s required load index
• Speed rating: V — suitable for normal street speeds within that rating

How durable and maintenance-friendly is the H.D. (Heavy Duty) version?

The Heavy Duty SR777 uses a more robust carcass and aramid reinforcement to handle heavier bike and rider combinations while resisting tire deformation. Routine inspection and correct tire pressure remain essential for even wear and consistent performance.

• H.D. construction increases resistance to carcass fatigue under load
• Aramid belt supports higher load capacity without sacrificing stability
• Regular pressure checks and inspections recommended for longest life

Who is this for: The Shinko SR777 HD 120/70-21 is aimed at cruiser riders who need a dependable front tire that pairs traditional bias-ply feel with modern tread features. Choose this tire if you ride a V‑Twin or metric cruiser with a 21" front wheel and want reinforced construction for a steadier front end, consistent traction in mixed weather, and a tire designed for street cruising rather than off-road or race use. Always confirm fitment and load/speed requirements with your vehicle placard, owner’s manual, or a tire professional before installation.

Note: Tire specifications and fitment should be verified against your motorcycle’s documentation and a qualified tire installer. Product data on this page applies to purchasers in the United States and Canada and is provided for guidance; no absolute guarantee of accuracy is claimed.