Replaced a smaller crankset (42 teeth) on a mountain bike with this one to get a higher gear ratio. It's quite heavy - in my case it's not critical. Suitable for bikes with fairly narrow gaps, proper chainline is achieved with BB-UN55 118mm cartridge. All three gears work with the existing derailleur. Please note that special tools are required to replace the connecting rod system. You only need a crank puller for cranks. If replacing the bottom bracket as well, add a bottom bracket removal tool (be careful - some are for the not-so-common 1/2-inch wrench). Finally, if you have an old-fashioned BB (not a cartridge), you'll need a snap ring wrench.
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