New Balance FuelCell Rebel v3 for Long Runs: How It Compares to the Adizero SL, Mach 5, and GEL Nimbus

Introduction

Most runners reach for a plush, cushioned trainer on long run day, and the New Balance FuelCell Rebel v3 is rarely the first pick for that job. But after using it for two long treadmill sessions during a current training block, including a 16-mile run with a big pace workout built into the middle, it earned a closer look. This review breaks down how the Rebel v3 behaves over long mileage, where it shines, where it falls short, and how it stacks up against three shoes that have handled long run duty in the same rotation: the adidas Adizero SL, the HOKA Mach 5, and the ASICS GEL Nimbus.

The run that shaped most of these impressions was a 16-miler with three warm-up miles, ten miles of pace work, and three cooldown miles. The pace block started at roughly marathon effort and progressed down to half marathon pace in the final two miles.

FuelCell Rebel v3: Specs and Feel

The Rebel v3 is a moderately cushioned, non-plated, lightweight trainer. It uses FuelCell foam, a TPU-EVA supercritical blend, and sits at roughly 28mm in the heel and 21mm in the forefoot, with about a six to seven millimeter drop. At around seven ounces, it is a very light, very flexible shoe, and that flexibility gives it a more natural feel underfoot than most max-cushion trainers.

That light, bendy character cuts both ways on a long run. Coming off a heavily cushioned shoe the day before, the first mile or two took some re-adaptation: the lower, more natural platform demands a little more from your lower legs. Once dialed in, though, the bounce in the foam is the standout trait.

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How the Rebel v3 Handles Pace Work in a Long Run

The Rebel v3 is at its best when the pace picks up. Steady miles around marathon effort felt good but not exceptional; this is really a 5K and 10K-flavored shoe, and there was a sense it was not being fully exploited at that slower gear.

At half marathon race pace, the story changed completely. In miles 11 to 13 of the run, when fatigue was starting to build, the shoe felt genuinely lively. That is the sweet spot: long runs that include faster work, ideally in the half marathon pace range and quicker. The bouncy foam and low weight make it much easier to keep turnover going when your legs are tired, without a mushy max-stack platform dragging you down.

The trade-off is protection. On a previous long run in the Rebel v3, the lower legs asked for more support in the final miles, and even on a stronger day, a niggle like a mildly sore calf felt less shielded than it would in a more cushioned shoe. If your long run is pure aerobic base building at slower-than-marathon pace, there is little reason to pick this shoe; a plusher option will serve you better. Also worth noting: this shoe has only been tested up to about two hours of running. Beyond that, more cushion is the safer call, and for 16-plus mile runs with hard marathon-pace sections, a plated race-day shoe will leave your legs far fresher for the days after.

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adidas Adizero SL: The Cushioned, Stable Alternative

The Adizero SL has been the long run shoe of choice for much of this training block. The foam is a traditional EVA rather than anything bouncy, but it is protective and very stable. As fatigue builds, impact does not hammer up through the legs, and recovery after long runs in it has been consistently good.

The downside shows up when you try to run faster. On a similar 16-mile long run with ten miles at a steadier pace, turnover topped out around a certain gear and would not go quicker; the shoe simply does not feel naturally fast. The weight difference is small, roughly 7.8 ounces versus about 7.1, but the foam is noticeably less peppy, and the final cooldown miles felt like more of a chore than they did in the Rebel v3.

HOKA Mach 5: Great Rocker, Finicky Foam

The Mach 5 has a pleasant rockered feel that works at both relaxed easy paces and faster efforts. The problem is durability in the foam. On anything longer than about 10 miles, the midsole starts to bottom out, with a sensation of the foot pressing through to the ground on every landing.

The stack is similar to the Rebel v3, but the foam feels less durable and supportive over long distances, and the lack of a rubber outsole means fewer total miles. For long runs in the 10 to 12 mile range it can work, and the Rebel v3 likely handles an 18-miler better, but beyond that a more cushioned shoe is the smarter pick, and a plated shoe is the better choice for any long run with race-pace sections.

ASICS GEL Nimbus: Max Cushion for Easy Miles

The GEL Nimbus is the outlier here: the only max-cushion shoe of the group, with a stack of 41.5mm in the heel and 33.5mm in the forefoot and an 8mm drop. It is the most supportive, most comfortable, and most cushioned of the four, with a strong forefoot rocker that helps pull your legs over. It is also the heaviest at 10.2 ounces, versus roughly eight for the Mach 5 and seven or under for the Adizero SL and Rebel v3.

For faster or lighter runners, it can feel like too much shoe for long efforts. It works best as a recovery run shoe, up to about 10 miles when feeling particularly beat up, but anything faster than roughly marathon pace makes it feel sluggish. A long 16 or 18-miler prescribed at easy aerobic pace is a legitimate use case; a workout-style long run is not.

Which One Should You Pick?

The decision comes down to what your long runs actually contain. If they are built around faster pace work, especially half marathon effort or quicker, the Rebel v3 is a viable and even enjoyable choice, provided you have strong lower legs and accept less protection in the later miles. It may even help build lower-leg strength earlier in a training block.

If your long runs are slower base-building efforts, cushion and comfort win: the Adizero SL offers protective stability, and the GEL Nimbus delivers maximum comfort for easy miles. The Mach 5 sits in between, with a nice rocker but foam that fades on runs past 10 miles. And for very long runs with hard marathon-pace sections, a plated superfoam race-day shoe remains the best way to protect your legs and make recovery easier.

Conclusion

The FuelCell Rebel v3 is a surprisingly capable long run shoe for one specific type of runner: an efficient, strong runner whose long runs include meaningful faster miles. Its light weight and bouncy FuelCell foam keep turnover easy even when fatigue sets in. For everyone else, the more cushioned alternatives in this comparison will protect your legs better over the long haul. Match the shoe to the session, and every option here has a clear place in a rotation.