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Shimano XT M770 Hollowtech II Triple Chainset
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Engineered for the way you ride! As Mountain bikes continue to become more diverse, obviously components must evolve.
A high performance chainset from the classic ATB group, offering the most advanced features.
Your chainset must fit onto your bottom bracket! There are currently four chainset/bottom bracket interfaces that you're likely to come across. If your bottom bracket is made by Shimano and it has splines, then you need an Octalink chainset. If your b/b is NOT made by Shimano and it has splines, it's almost certainly ISIS. There are a very few non-Shimano chainsets with Shimano Octalink interfaces so, to be sure, count the splines - ISIS has 9, Octalink has (surprise, surprise) 8. No matter which brand of b/b you have, if it has a square interface, it will require a traditional square taper chainset. If you have one of the new Hollowtech II systems, you will need to choose the exact chainset that matches your bottom bracket. Most MTB chainsets are now 9-speed compatible but these will work with an 8-speed system.
Shimano are the makers of the world's most well known cycle component brand. Established in 1921 when the first cycle freewheel was forged. Shimano produce drivetrains, wheels, pedals, shoes, cycling clothing and pretty much every Shimano cycle accessory you can think of! Famous for their top end products ridden by the pro's, Dura-Ace and XTR, which cover both road and MTB's. At Shimano, they're doing everything they can to respond to heightened environmental concerns. Shimano are proud to be a producer of bicycle components that help people to enjoy outdoor sports and interact with nature through healthy non-polluting activities. In their 87 plus years of existence Shimano have accumulated a wealth of technology and product development and expertise that serves as the driving force behind their continually evolving product line.
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The new XT adds impressive chainring durability to proven performance, making it superb value. Shimano's Hollowtech arms have a fantastic reputation for strength to weight ratio, and loads of top DH racers actually run XT cranks instead of heavier Saints. Shifting is best in class and they're easy to install, thanks to the plastic cup and clamp bolt arrangement. The new steel and composite middle chainring means an extended lifespan, while the weight is still good (if not exceptional). There are a few grumbles. Torx key chainring bolts mean finding a new tool, and bottom bracket life isn't great. But with longer lived aftermarket alternatives now available, that's less of an issue - especially for £120.
Bit heavy and the BB could last better, but a good value tough trail chainset otherwise.
The new incarnation of Shimano's workhorse XT crankset hasn't changed as much as expected, but what has changed is worthwile. The crank arms get a flatter, broader profile with U-section spider arms, which are slightly stiffer than the already stiff Hollowtech arms of before.
The twin bolts in the left-hand crank arm attachment system are the same as before, rather than using the new XTR single-bolt and preload collar system. The outer ring is thicker and stiffer, but it's the new middle ring that's the really significant thing for UK riders - it uses a broad composite body with a thin steel-tooth ring set into it. It's as light as Shimano's alloy chainrings but it's much stiffer to provide accurate shifting and lifespan is massively improved. The bottom bracket bearings are unchanged though, so you'll still be replacing them fairly regularly as they wear.
Shimano's stiff yet light workhorse crankset gets the high-durability ring it's always lacked.
The XT has always been a benchmark crankset, and if you're looking for light but tough cranks without paying the earth then it's still a definite contender.
A thick machined and double anodised outer ring, a steel and composite middle ring, and plated alloy inner ring combine to give impressive durability and drive stiffness.
The hollow forged arms are tough enough to be a popular choice on the downhill circuit, while also being light enough to run pricier carbon sets close on weight, and the integrated driveside axle mean it's stiff underfoot.
We have bent a couple, though, and there are no steel pedal reinforcements in the arms so it's only a reliable gravity option for lighter, smoother riders.
Shimano's external bottom brackets are currently running longer than any other original equipment units. As long as you check bolts regularly, simple installation generally leads to trouble-free long-term use. The cup threads are quite shallow, which can be a problem with bottom bracket-fit chain devices.
The arms start to look shabby a lot quicker than Shimano's SLX cranks, though, and the 40g weight saving for an extra £49 only seems worth it if you're a weight fanatic.
Still a winning blend of low weight, high strength and medium price
Shimano's XT crank will always be a benchmark to judge others by. While it's primarily a cross-country unit we've seen plenty of downhill racers using XT cranks to save weight.
The hollow arms and integrated driveside axle mean it's stiff underfoot and the composite-and-steel middle ring is a tough piece in terms of landings and mileage too.
We have bent a couple, though, and there are no steel pedal reinforcements in the arms so it's only a reliable gravity option for lighter, smoother riders.
The cup threads are also quite shallow, which can be a problem with bottom bracket-fit chain devices. It's still tougher and more reliable than similar weight/price competitors, with only Shimano's own SLX looking like better value.
Cross-country light but tough and stiff enough for aggro all-rounder work
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