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Square taper interface
With plastic chaingaurd
Shimano Reference Number: FC-M171
Shimano Altus crank sets is a budget crankset that has many features of high quality cranks at an affordable price.
170-mm 42/34/24T 6/7/8 Speed
Most Helpful Customer Reviews
The FC-M171 looks beautiful. The product (48 38 28T with 175 mm cranks) matched the photo perfectly. The cranks are finished in a somewhat rough to the touch black coating. The machining for the pedal threads and spindle connections is excellent and shines like silver. Two snap in plastic crank bolt covers are included. The people at the factory must have cared about what they were doing, since precision shows throughout the crankset. Stamped with, "SHIMANO 175 MALAYSIA VIA OC." The bash guard is made of thick, rigid plastic, so I am confident it will be stronger than necessary to hold up to commuter cycling on my hybrid 18 speed bike. The product is better than expected and made a fantastic first impression. It spun freely on a 120 mm sealed bottom bracket for an 18 speed, steel framed, hybrid bike. No interference from the small chainring to the frame.
Replaced my cheap Sun Run crankset on my Salcano MTB with the Shimano Altus. Definitely a much better quality crankset. My Sun Run chainring folded in half like a taco after 2 hours of use. The Shimano Altus is bigger and feels a lot more sturdier than the Sun Run. But, I'm noticing that my bottom bracket bearings are wearing out. If you need to replace a cheap crankset, replace the bottom bracket and derailleur also. Normally, I wouldn't buy such a poorly made bike as Salcano. But, being deployed to Afghanistan, there is little choice. The Salcano MTB was a throwaway choice, but parts started breaking as soon as I rode it.
Also, stay away from Sun Run and Sun Race components. They are nothing but cheap junk made in China trying to take advantage of the name similarity to SR Suntour--which makes great components.
The original crank set that came with the bike (a Suntour 42-32-22 / 170mm) got damaged in a crash and decided to get a Shimano since the rest of the drivetrain is Shimano already. To add some "ommph" to the bike I selected the 42-38-28 / 175mm crank arm size with the chainguard ring.
It fitted perfectly and works like a charm. Having two more teeth on the 2nd chainring and the "granny-gear" makes a difference, also the 175 mm instead of the standard 170 mm crank arms add a nice leverage. The bike now has much better acceleration and performance. This product is made for square taper, and fits 9/16" bolt pedals. It includes the dust caps, but doesn't include the mounting bolts that go into the bottom bracket axle, so if the original bolts are damaged new ones have to be ordered extra.
Oddly, the instruction sheet was mostly about installing a BB (sealed Bottom Bracket Axle) unit. Fortunately installing a crank set is a simple, straight forward procedure; and...
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