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Saucony Endorphin Speed 2: A Review of the Ultimate Speed Trainer

CEO Tinh Phung
Hands down, the Saucony Endorphin Speed 2 rocks! Not much has changed from its predecessor, the Endorphin Speed, and that's a good thing. This speed trainer and tempo day shoe didn't need many updates. It's...


Hands down, the Saucony Endorphin Speed 2 rocks! Not much has changed from its predecessor, the Endorphin Speed, and that's a good thing. This speed trainer and tempo day shoe didn't need many updates. It's built to complement its race sibling, the Endorphin Pro 2, but it can definitely stand on its own as a race-capable and durable shoe for daily use.

Who Should Buy the Saucony Endorphin Speed 2?

If you're looking for a lightweight trainer with a bouncy and responsive ride that's quick enough for race days, yet comfortable and durable for daily training runs, then the Endorphin Speed 2 is perfect for you. It's a versatile shoe that can do it all, eliminating the need for multiple pairs to cover your training needs. Plus, it offers excellent value for your money.

Who Should Not Buy It?

Don't purchase the Speed 2 if:

  • You're looking for an elite-level race shoe. In that case, I recommend checking out the Endorphin Pro 2 or the ASICS MetaSpeed Sky.
  • You have super wide feet. Consider spending a little extra and going for the Pro 2, which offers a slightly wider fit.
  • You're a heel striker. The Speed 2 has a wobbly platform unless you're on your toes. For heel strikers, I suggest checking out the Hoka Rocket X instead.

A Closer Look at the Fit

The Endorphin Speed 2 runs true to size but has a slightly narrow upper. During testing, I found that the forefoot measures 109.2mm wide and the heel measures 85mm, which is slightly wider than the Pro 2. However, the upper on the Speed 2 feels more constricting due to its plush and thicker material. If you have above-average width feet, it may require some break-in time to achieve optimal comfort.


Enhanced Comfort and Design

The comfort of the Speed 2 is remarkable. It strikes the perfect balance with just enough padding for longer efforts without feeling overly cushy. One notable improvement is the gusseted tongue, which Saucony adjusted based on feedback. The tongue now sits in a more optimal position, providing a snugger fit. Additionally, the gusset material is stretchier, enhancing overall comfort.

The padded tongue and plush upper add to the shoe's comfort, while remaining breathable. Saucony has done an excellent job in designing a shoe that feels great underfoot and offers effortless transitions with its rockered design.

Built for Speed

Despite being categorized as a trainer, the Endorphin Speed 2 runs more like a speed shoe. It features a nylon plate that provides a similar experience to a carbon-plate shoe, offering flexibility and a responsive ride. While the Speed 2 measures 39.6N on our flex test (slightly above average), the Pro 2, with its carbon plate, registers a significantly stiffer 94.3N. The Speed 2 also has a slightly thicker midsole and a less noticeable rocker, making it easier to adapt to for those new to rockered shoes.


Adjusting to the Rocker and Wobble

Rockered shoes like the Speed 2 require some getting used to, but once you become accustomed to them, the rolling motion feels fantastic. However, be aware that the narrow heel of the Speed 2 may initially cause some wobbliness, particularly for heel strikers or those running at a gentler pace.

Lightweight and Quick

At a mere 8.1 ounces (229g), the Endorphin Speed 2 is surprisingly lightweight. As a training shoe, it's an incredible feat, especially considering that it's only half an ounce heavier than the Pro 2, which is a full-on racing shoe. This makes the Speed 2 an ideal choice for both training and racing, as it offers nearly the same performance as the more expensive Pro 2.

Durability and Grip

In terms of durability, the Endorphin line, including the Speed 2, is not as robust as heavier trainers like the Saucony Triumph line. The exposed midsole is a potential concern, although it should hold up better than the Pro 2's midsole. As for the outsole, it provides decent grip on dry roads, but caution is necessary on wet surfaces or in the gym due to its thinner rubber that may slip more easily.


Breathability and Lockdown

The upper of the Speed 2 is breathable, ensuring your feet stay cool during runs. While it is slightly thicker than the Pro 2's upper, it doesn't become excessively hot. The breathability rating is 3 out of 5, with heat escaping through vent perforations. However, there is room for improvement in terms of the upper material's thinness and breathability.

The lockdown of the Speed 2 is better than its racing sibling, the Pro 2. The Speed 2 offers a snugger fit with enhanced structure and a slightly narrower design. The lacing system also differs, with the Speed 2 crossing the top of the foot one less time than the Pro 2, contributing to improved lockdown.

Additional Features

The Endorphin Speed 2 comes with an extra set of laces in a different color, allowing you to customize the shoe's appearance. It's a small detail, but a thoughtful addition. Additionally, the back of the shoe features a reflective patch, enhancing visibility during nighttime runs, adding to the overall safety of the shoe.


Final Verdict

Without a doubt, the Saucony Endorphin Speed 2 is an exceptional shoe. For most runners, there is no need to invest in the more expensive Endorphin Pro 2 unless you require the weight and speed advantage of a true race shoe. The Speed 2 is a standout middle sibling that can handle all your training and racing needs. In fact, it's a versatile option that eliminates the need for an additional race-day shoe.

In conclusion, the Saucony Endorphin Speed 2 is the ultimate speed trainer that offers a lightweight and responsive ride, making it a top choice for runners looking to achieve their personal bests without compromising on comfort and durability.