*Weights vary with sample size and source. The commonly reported weights are not a controlled, same-size comparison. Higher bending force means greater resistance to bending.
Ride and cushioning
The key change is extra foam: commonly reported specifications rise from 30/24 mm in the v4 to 35/29 mm in the v5. That gives the v5 more material beneath both heel and forefoot while retaining a stated 6 mm drop.
The practical benefit is greater cushioning depth when a run extends beyond a short workout. Runner’s World describes the v5 as softer and more fluid than the flatter, snappier v4. That supports choosing the v5 when underfoot comfort matters more than feeling every change in the road.
However, cushioning and rebound are different qualities. The measurements show slightly higher heel shock absorption in the v5, but lower heel energy return. Forefoot energy return is almost unchanged. The additional foam therefore supports a comfort-led upgrade, not a claim that every stride becomes more energetic.
Both remain flexible, unplated shoes. The v5 requires more force to bend in the supplied lab tests, yet it still allows natural forefoot movement rather than delivering the rigid leverage of a plated racer.
Speed sessions versus everyday miles
For intervals and shorter tempo sessions, the v4’s lower profile and lighter construction retain a clear purpose. Reviewers repeatedly describe an engaging ride that responds well when effort increases. If that is why you bought it, the v5 changes the character you may already like.
The v5 makes more sense when one shoe must handle easy mileage, steady running and progressive long runs. Its softer cushioning broadens its everyday role, although Doctors of Running reports that aggressive 5K efforts can feel less immediate.
Neither model has an exclusive claim to a particular pace. Both can handle faster running, and both have been used for relaxed miles. The distinction is emphasis: the v4 leans toward a direct workout feel, while the v5 puts more comfort around a similarly lightweight training concept.
Long runs and marathon training
The v5 is the stronger starting point if your v4 leaves your forefoot feeling underprotected late in a run. The extra cushioning addresses that limitation directly, without turning the Rebel into a heavily built trainer.
The v4’s distance ceiling is less clear. Some supplied reviewers happily used it for long runs or recommend it for marathons; Run To The Finish is more cautious, particularly for runners spending longer on their feet. That disagreement rules out a universal maximum distance.
The v5 has more encouraging long-distance reports, including The Run Testers’ account of one tester completing Comrades in it. That demonstrates what worked for one runner, not guaranteed marathon suitability. For either model, use your own longer training runs to assess comfort before choosing it for race day.
Fit, heel comfort and stability
The v4 offers generous forefoot and midfoot space, which can accommodate toe splay but leave narrower feet struggling for lockdown. Reports of Achilles rubbing also vary: some testers had significant irritation, while others experienced none.
The v5 adds tongue and collar padding, and several reviewers report better heel security. It is worth considering if those areas spoiled your experience of the v4, although no collar redesign guarantees an irritation-free fit.
Do not assume the v5 will fit tightly. Some sources describe a more fitted forefoot than the v4, while others still find generous volume and movement on turns. Try your usual running size first; reducing length to correct excess width can create a different problem.
For stability, the v4’s lower, broad platform remains persuasive. Doctors of Running considers the taller, softer v5 slightly less inherently stable, although other reviewers find its flaring reassuring. Both are neutral shoes, so extra cushioning should not be mistaken for corrective support.
Grip, durability and value
The v5 adds rubber coverage, but the research does not establish a reliable lifespan advantage. Both retain exposed foam, and lab upper-abrasion results raise concerns about toe-area wear. Early scuffing alone does not prove the cushioning has failed.
Wet-road accounts vary for both models, so there is insufficient agreement to recommend upgrading specifically for grip. Ventilation is similarly mixed for the v5: several wear-testers praise it, while RunRepeat and Runner’s Lab describe a warmer upper.
Commonly reported review-era retail prices are US$140 and £140 for either model. That makes the v5’s added cushioning attractive at equal prices, but current discounts are not supplied. A cheaper v4 can be better value when its fit and training role already suit you.
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Final Verdict
Choose the New Balance FuelCell Rebel v5 if you want a more comfortable daily trainer, extra protection for longer runs, or an alternative to the v4’s minimal tongue and collar.
Choose the New Balance FuelCell Rebel v4 if your priorities are shorter workouts, ground feel and a broad, lower platform especially at a worthwhile discount.
Existing v4 owners with comfortable, serviceable shoes do not need to upgrade automatically. The v5 earns its place when cushioning or upper comfort solves an actual problem; it offers less reason to switch when the v4’s direct feel is precisely what you enjoy.
FAQ
Is the New Balance FuelCell Rebel v5 worth upgrading to from the v4?
Yes, if you want more cushioning for everyday mileage and longer runs, or if the v4’s tongue and collar bother you. The New Balance FuelCell Rebel v4 remains worth keeping if its fit is comfortable and you value its lower, lighter workout feel.
What changed between the New Balance FuelCell Rebel v4 and v5?
Commonly reported stack height increased by 5 mm at both heel and forefoot, while stated drop remained 6 mm. The v5 also gained tongue and collar padding and revised rubber coverage. Both versions already use PEBA/EVA blended FuelCell foam without a plate.
Is the New Balance FuelCell Rebel v5 faster than the v4?
The supplied research does not establish a faster model through controlled performance testing. Several reviewers prefer the New Balance FuelCell Rebel v4’s more direct feel for short, fast workouts. The New Balance FuelCell Rebel v5 places greater emphasis on cushioning and daily versatility.
Which Rebel is better for a first marathon?
The New Balance FuelCell Rebel v5 is the more persuasive starting point because it adds cushioning depth, particularly beneath the forefoot. However, neither is a guaranteed marathon choice. Reports on the v4’s distance suitability conflict, and successful long-distance use of the v5 by individual reviewers does not establish suitability for every runner.
Do the Rebel v5 and v4 fit true to size?
Most supplied wear-testers recommend their usual running size. Width and volume are more contentious: the v4 can feel broad and loose, while the v5 is more fitted for some testers but remains roomy for others. Check length and lockdown separately rather than sizing down simply to remove spare width.
Which is better for wide feet?
The New Balance FuelCell Rebel v4 has stronger evidence for a particularly generous standard fit. The New Balance FuelCell Rebel v5 also accommodates broader feet for several testers, though others describe a narrower fit than the v4. Wide-width availability depends on market and listing; do not assume every region offers the same options.
Does the Rebel v5 have better energy return?
Not uniformly. The measurements show heel energy return of 59.8% for the v5 versus 63.1% for the v4, and forefoot energy return of 67.3% versus 66.8%. Those results support distinguishing cushioning from rebound rather than calling the newer shoe universally bouncier.
Why do the stack-height figures differ?
The research includes both published specifications and independent measurements. Commonly reported specifications are 35/29 mm for the v5 and 30/24 mm for the v4. The measured figures are 33.0/26.7 mm and 28.0/21.5 mm respectively. Other summaries contain different figures; these should not be mixed into one comparison without qualification.
Which lasts longer or grips wet roads better?
The research does not support a definitive winner. Both have exposed foam and upper-wear concerns, while wet-grip reports vary by reviewer and surface. Added rubber on the New Balance FuelCell Rebel v5 is a construction change, not proof of a particular mileage lifespan or universally better traction.
