On Cloudflow 5 vs Saucony Endorphin Speed 6
Cloudflow 5 or Endorphin Speed 6? Here’s how they compare on feel, fit, brand specs and price, from the fitting team at The Run House.
The short answer
Want a firm, rockered On for faster runs? Get the Cloudflow 5.
Want a lighter, bouncier plated shoe for workouts? Get the Endorphin Speed 6.
Get the Cloudflow 5 if
- You like a firmer, more stable feel
- It’s mostly for easy days
- You like a stiffer, rocker-style forefoot that rolls you forward
- You prefer a lower drop (6mm vs 8mm)
Get the Endorphin Speed 6 if
- You want a nylon plate for faster running
- You want a little more give underfoot
- You want more bounce and energy back
- You want more foam underfoot (4mm more at the heel)
On the run
Cloudflow 5: On’s firm, plated tempo shoe. Very firm, with a nylon-fiberglass Speedboard plate and a pronounced rocker that rolls you forward. Stable for its size, but there’s almost no bounce.
Endorphin Speed 6: The plated workout shoe, sharpened. Springy and quick, with a stiff nylon plate and a strong rocker that rolls you forward at tempo pace. It’s on the firm side, so slow easy runs can feel harsh.
The Endorphin Speed 6 hasn’t been lab tested yet, so its feel ratings are our estimates from published reviews.
Specs side by side
| Cloudflow 5 | Endorphin Speed 6 | |
|---|---|---|
| Price | $180 | $180 |
| Stack height (heel / forefoot) | 34 / 28mm* | 38 / 30mm |
| Drop | 6mm* | 8mm |
| Weight, men’s | 9.6 oz* | 8.2 oz |
| Weight, women’s | Not available | 6.9 oz |
| Support | Neutral | Neutral |
| Plate | Speedboard plate | Nylon plate |
| Widths | Standard | Standard, Wide |
| Built for | Tempo & workouts, Easy days | Tempo & workouts, Race day |
| Expected life | 300–400 miles | 250–350 miles |
Stack, drop and weight come from each brand’s own website. Numbers marked * aren’t published by the brand and come from other published specs. Weights are for the size each brand quotes. Expected life is our estimate.
Fit
Cloudflow 5. Runs slightly short, so consider a half size up. Secure, pressure-free lockdown and a well-padded tongue.
Endorphin Speed 6. Some testers found it a touch short, so if you’re between sizes, go up a half. The toebox is roomier than the Speed 5’s, though the midfoot can feel snug. Wide available.
Try them on
Come try on both at The Run House in Walpole, Needham or Falmouth. Gait analysis is always free.
Shop the Cloudflow 5 · Shop the Endorphin Speed 6 · Compare other running shoes