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The FuelCell SuperComp LD-X 3 is New Balance's long-distance track spike, built for the 5,000m, 10,000m and steeplechase rather than the road. It sits at the sharp end of New Balance's racing line, a full-length carbon spike aimed at runners who live for the last lap. If your events are shorter and sharper, the SuperComp MD-X 3 is the middle-distance sibling, but for the long stuff this is the one. This is a running shoe in the loosest sense. It is a track weapon, stripped down and firm, with just enough FuelCell foam under a rigid carbon plate to give you propulsion without slowing the transition. At GBP 160 it is priced with the premium spikes it competes against. We rate it as a genuine championship-level option for distance track racing, and the steeplechase-ready build widens its appeal beyond the flat. If you race on the track and want carbon propulsion through every stride, it belongs on your shortlist. Just know it is single-minded: this is race day only.
Track spikes are meant to fit close, and the SuperComp LD-X 3 is no exception. We would size it true to size against your everyday running shoe if you want a race-snug hold, or a half size down if you like a spike that feels welded to your foot with zero slippage on the bends. The upper wraps tight through the midfoot and locks the heel in place, which is what you want when you are leaning into a lap at full tilt. The toe box is low and racy rather than roomy, so wide-footed runners should try before committing. There is very little give in the fit, by design: a spike that moves is a spike that costs you energy and blisters. Wear thin racing socks, expect a firm first few strides, and know it will feel dialled in once you are up on your toes. If you are between sizes and race longer track events, lean to the larger size for a little toe room over 25 laps.
On the track this spike is fast and direct. The full-length carbon plate snaps you onto your toes and holds you there, and the thin FuelCell layer gives just enough return to keep the legs turning over lap after lap. It is firm. There is no mistaking this for a cushioned trainer, and it is not trying to be. Hold race pace and it comes alive, rewarding a quick, light footstrike with clean, efficient transitions. Drop the pace and it feels stiff and unforgiving, because it is built for one job. Over a 5,000m or 10,000m the ride stays honest: no mush, no sag, just a rigid, propulsive platform under a stripped-back upper.
Cushioning is not the point of a distance spike, and the SuperComp LD-X 3 keeps it minimal. There is a thin band of FuelCell foam beneath the carbon plate, enough to take the sting out of a firm track and stop the plate feeling dead, but nothing like the stack of a road super-shoe. Over shorter track distances you will barely notice it. Push into a 10,000m and the firmness starts to ask questions of your legs, so this suits efficient, forefoot-biased runners more than heavy heel-strikers. If you want protection and comfort you are in the wrong category. This foam is here to be fast, not soft.
Stability comes from the spike plate and the snug upper rather than any built-up support, and that is normal for the category. The SuperComp LD-X 3 is a neutral spike, so it offers no structured pronation control. On the track the pins bite hard into the surface, giving you a planted, confident feel through the bends and out of a finishing kick. The narrow, locked-down fit stops your foot sliding around, which matters far more than midsole support at these speeds. If you need genuine stability or you overpronate badly, a spike like this will not correct it, and you should factor that into hard track sessions and longer races.
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The upper is thin, light and built to disappear on your foot, exactly what you want from a racing spike. It wraps close through the midfoot for a secure hold and keeps weight to an absolute minimum, so there is very little material between you and the track. Comfort in the plush sense is not on the menu: this is a race-day upper, snug and unforgiving of a poor fit, and it rewards a foot that fills it well. Wear thin socks and expect a firm, glove-like hold rather than a soft one. For the short, intense life a spike lives, it does its job well and never gets in the way of speed.
| Category | Race |
| Surface | Track |
| Drop | 3.8mm |
| Heel Stack | 18.5mm |
| Forefoot Stack | 14.7mm |
| Carbon Plated | Yes |
| Stability | No |