Inputs
- A few quick answers
- Timing, training, or body cues
Outputs
- A clear target, score, or risk level
- The next action to take today
Your Data
Daily Trainer
Max Cushion
Super Shoe
Racing Spike
Estimated Time Savings
14sec
You could run 14 seconds faster just by switching to XC Spike (avg)!
18:30 → 18:16
Training Shoe
Nike Pegasus 41
10.4oz
Race Shoe
XC Spike (avg)
5.5oz
Weight Saved Per Foot
-4.9 oz
⚡ Rough Estimate
Research by Franz et al. (2012) showed that each 100g (~3.5 oz) of shoe weight reduction improves running economy by ~1%. Treat this as a rough comparison, not a training prescription.
Use this in practice
- Show this to athletes who insist on racing in daily trainers — the math is undeniable.
- XC spikes (5-6 oz) give the biggest advantage on grass/dirt courses. Save super shoes for roads.
- Break in race shoes 2-3 times before racing. Never debut new shoes at a championship meet.
shoe weight comparisons
Practical examples
Race-shoe comparison examples that stay in the same trainer-versus-spike and trainer-versus-super-shoe lane as the converter.
Hurdles fueling visual
A practical event-group anchor for hurdle-specific tools and examples.
Sprints and field-events visual
Useful when the tool serves sprinters, jumpers, or short-power athletes.
Max-cushion trainer versus carbon racer
A practical weight-gap example for athletes moving from a heavy trainer to a lighter race-day option.