Details
Sometimes it's okay to show off a little
Unlock your potential and go farther with the Circuit road shoe. Equal parts stiff and comfortable, compatible with both 2-bolt SPD-style and 3-bolt cleats, this shoe is ready for anything.
Product details
- inForm Race last offers a slightly roomier, high-performance fit
- Nylon composite Bronze Series sole
- PowerTruss sole design improves stiffness without adding significant weight
- Boa L6 dial for precise adjustment
- Stiffness index - 7 of 14
- Compatible with 3-bolt and 2-bolt SPD-style cleats (2-bolt mounting plate sold separately)
Specifications
- Upper Fiber Content: 56.9% PU / 10.5% Polyester / 32.2% Nylon / 0.4% Steel
- Sole Fiber Content: 85% Nylon / 15% Fiberglass
- Liner Fiber Content: 100% Polyester


SPD/2-Bolt

Look/SPD-SL/3-Bolt

Speedplay/4-Bolt
SPD/2-Bolt Cleats are most commonly found on Mountain Bike shoes. Look/SPD-SL/3-Bolt Cleats are most commonly found on Road Bike shoes.
Cleats are sold separately or with pedals. Be sure your shoes feature the correct bolt pattern.
Part Numbers
Option | UPC | MPN | Store SKU |
---|---|---|---|
Viper Red / 42 | 601479682737 | 551619 | SHO509613128 |
Viper Red / 43 | 601479682744 | 551620 | SHO505898618 |
Viper Red / 44 | 601479682751 | 551621 | SHO505464818 |
Viper Red / 45 | 601479682768 | 551622 | SHO508170058 |
Viper Red / 46 | 601479682775 | 551623 | SHO509984208 |
Viper Red / 47 | 601479682782 | 551624 | SHO508054638 |