I've been looking for a replacement for the steel cranks on my Kent department store bike for a while. After installing the UN55 bottom bracket, the M131/311 fitted perfectly. I had to readjust the derailleur to make it work, but definitely saved some weight. The M311 weighs 1097 grams without pedals. The difference between the M311 and the steel crank from the department store is about 0.8 kilos. Installation was painless and I recommend having a torque wrench handy. Overall: 5/5 stars, cheap upgrade for cheap bikes.
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