You’ll see various versions of the Firex, some priced with and some without Truvativ’s GXP (Giga X-Pipe) external-bearing bottom bracket. This model includes the bottom bracket and features 44/32/22 tooth chainrings. There’s also another version with 48/36/26 tooth rings.
The crankset weighs 815g and the GXP bottom bracket weighs 115g. That’s pretty much on a par with Shimano LX. The price is similar too, although the Firex tends to turn up on bikes at Shimano XT groupset level.
The mirror black finish is harder wearing than most of Shimano’s offerings but it’ll scuff up if your shoes rub.
Cold-forged, CNC-machined, rampedand – pinned rings keep the shifting crisp and the teeth last quite a long time. We like the double-sided allen key ring bolts too – it’s time those fiddly slotted bolt backs were confined to the bins of history